1. |
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2. |
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3. |
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4. |
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5. |
- Grundevik, P, et al.
(author)
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Isotope shifts in dysprosium measured by high resolution laser spectroscopy
- 1976
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In: Physics Letters. Section A: General, Atomic and Solid State Physics. - : Elsevier BV. - 0375-9601. ; 56:1, s. 25-26
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Journal article (peer-reviewed)abstract
- Using a pulsed dye laser, acting on a collimated atomic beam, the isotope shifts between the dysprosium isotopes 164, 162, and 160 were measured with high precision in three lines, , and 5652 Å.
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6. |
- Gustavsson, M, et al.
(author)
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An efficient method for measuring atomic and molecular lifetimes using a modulated or deflected CW dye laser beam
- 1977
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In: Physics Letters. Section A: General, Atomic and Solid State Physics. - : Elsevier BV. - 0375-9601. ; 64:3, s. 289-291
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Journal article (peer-reviewed)abstract
- By pulse modulating or deflecting a CW dye laser beam, cascade-free lifetime determinations at high spectral resolution can be performed with the decayed-coincidence technique using measuring times of about 1 minute. The method is illustrated by lifetime measurements for the 72P3/21/2 levels of cesium.
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7. |
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8. |
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9. |
- Jiang, Z. K, et al.
(author)
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Lifetimes of Rydberg Levels In the Perturbed 6snp P-1,3(1) Series of Ybi
- 1995
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In: Physics Letters. Section A: General, Atomic and Solid State Physics. - : Elsevier BV. - 0375-9601. ; 204:1, s. 49-53
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Journal article (peer-reviewed)abstract
- Using two methods: (1) three-step excitation and (2) single UV photon excitation in an atomic beam with direct observation of the decay of the fluorescence light, we have measured the lifetimes of the Rydberg levels of YbI belonging to the perturbed series 6snp J = 1 levels. The measured values have been interpreted by the multichannel quantum defect theory (MQDT).
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10. |
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11. |
- Klein, SR, et al.
(author)
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Does particle decay cause wave function collapse: an experimental test
- 2003
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In: Physics Letters. Section A: General, Atomic and Solid State Physics. - 0375-9601. ; 308:5-6, s. 323-328
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Journal article (peer-reviewed)abstract
- We describe an experimental test of whether particle decay causes wave function collapse. The test uses interference between two well separated, but coherent, sources of vector mesons. The short-lived mesons decay before their wave functions can overlap, so any interference must involve identical final states. Unlike previous tests of non-locality, the interference involves continuous variables, momentum and position. Interference can only occur if the wave function retains amplitudes for all possible decays. The interference can be studied through the transverse momentum spectrum of the reconstructed mesons.
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12. |
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13. |
- Minnhagen, Petter
(author)
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Exact numerical solutions of a Nozieres-De Dominicis-type model problem
- 1976
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In: Physics Letters. Section A: General, Atomic and Solid State Physics. - : Elsevier BV. - 0375-9601. ; 56A:4, s. 327-329
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Journal article (peer-reviewed)abstract
- It is inferred from a model calculation that, to a very good approximation, the XPS spectra from core electrons in simple metals should follow the edge power law up to the first plasmon satellite. The power law indices obtained are in good agreement with recent experimental XPS values for Na, Mg and Al.(9 refs)
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14. |
- Svanberg, Sune, et al.
(author)
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Determination of gJ factors in the np ^(2)P_(3/2) series of the Cs-I spectrum
- 1970
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In: Physics Letters. Section A: General, Atomic and Solid State Physics. - : Elsevier BV. - 0375-9601. ; 32:7, s. 459-460
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Journal article (peer-reviewed)abstract
- Landé gJ factors are determined for the three lowest 2P levels in the Cs atom from measured level crossing positions together with a factors determined by zero field double resonance. The hyperfine anomalies between 133Cs, 135Cs and 137Cs are discussed.
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15. |
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16. |
- Xu, Hongxing
(author)
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A new method by extending Mie theory to calculate local field in outside/inside of aggregates of arbitrary spheres
- 2003
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In: Physics Letters. Section A: General, Atomic and Solid State Physics. - 0375-9601. ; 312:5-6, s. 411-419
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Journal article (peer-reviewed)abstract
- In this Letter we describe a new method to combine the methods of matrix inversion and order-of-scattering to solve the light scattering of aggregates of arbitrary spheres by extending Mie theory, which is more expedient for calculations of the local field in both outside and inside of the spheres. (C) 2003 Elsevier Science B.V. All rights reserved.
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17. |
- Anderson, D., et al.
(author)
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Modulational instabilities within the thermal wave model description of high energy charged particle beam dynamics
- 1999
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In: Physics Letters A. - : Elsevier. - 0375-9601 .- 1873-2429. ; 258:4-6, s. 244-248
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Journal article (peer-reviewed)abstract
- Within the thermal wave model (TWM) description, an investigation was made of the longitudinal instability properties of a coasting high energy charged particle beam, where the interaction between the beam and its surroundings is characterized in terms of a complex impedance. The analysis is shown to correctly reproduce the characteristic features of the coherent instability as obtained previously by conventional techniques based on the Vlasov equation for the beam distribution. The results further validate the TWM approach as a consistent alternative description for analyzing the dynamics of high energy charged particle beams.
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18. |
- Andersson, Ove, et al.
(author)
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Reorientational relaxation in C60 following a pressure induced change in the pentagon/hexagon equilibrium ratio
- 1995
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In: Physics Letters A. - : Elsevier Science B.V.. - 0375-9601 .- 1873-2429. ; 206:3-4, s. 260-264
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Journal article (peer-reviewed)abstract
- The orientational structure of C60 depends on pressure and temperature. Pressurization below the glass transition temperature Tg can freeze in non-equilibrium orientational structures. The relaxation of such structures on heating through Tg has been studied through thermal conductivity measurements and the effects observed are explained in a simple model.
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19. |
- Basylko, S. A., et al.
(author)
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Coulomb glass in the restricted random phase approximation
- 2002
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In: Physics Letters A. - 0375-9601 .- 1873-2429. ; 298:06-maj, s. 416-421
-
Journal article (peer-reviewed)abstract
- A three-dimensional model of N/2 electrons localized on N randomly distributed donor sites of density n and with the acceptor charge uniformly smeared on these sites, -e/2 on each. has been considered in the restricted random phase approximation (RRPA) which uses the set of 3N Fourier components of the local charge density as the independent collective variables. The energy e(T) per site and the density of one-site excitation energy (DOSE) g(epsilon) are shown to he, respectively, in excellent quantitative and in good qualitative agreement with the Monte Carlo simulation data in the whole temperature region 0.1 < T < 100, where these simulations were performed (e(2)n(1/3)/k(B) being the temperature scale). The pair correlator for the one-site energies g(epsilon,+/-epsilon, r) is found to have the slow decoupling law similar to(+/-1/r) for T less than or similar to 1 and r much greater than r(d) (r(d), Debye screening radius). The status of the commonly accepted asymptotic g(epsilon) similar to (epsilon - mu)(d-1) (d and mu being, respectively, the spatial dimension and the Fermi energy) is discussed. The deduction of this asymptotic is shown to be based on the strong and questionable conjecture about decoupling of correlations between one-site excitation energies in the vicinity of mu.
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20. |
- Basylko, S. A., et al.
(author)
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Ground-state study of a donor-acceptor model with finite charge-transfer energy
- 2000
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In: Physics Letters A. - 0375-9601 .- 1873-2429. ; 271:02-jan, s. 134-138
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Journal article (peer-reviewed)abstract
- A donor-acceptor model with randomly distributed N donor and N acceptor sites and with finite charge transfer energy Delta is investigated at zero temperature by means of computer simulations on two-dimensional samples of different sizes, We demonstrate that the density of one-electron excitations g(epsilon) for accepters in the vicinity of the Fermi energy mu depends essentially on the size of the sample investigated and that g(epsilon) further away from mu exhibits a size-independent power-law with the non-universal exponent decreasing with increasing Delta. Rigorous relations for mu and for the mapping of g(epsilon) for donors into g(epsilon) for accepters are also given.
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21. |
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22. |
- Bonnaud, Etienne L., et al.
(author)
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Inertia and damping effects on the damage-dependent burst size distribution of fiber bundles
- 2001
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In: Physics Letters A. - 0375-9601 .- 1873-2429. ; 290, s. 261-269
-
Journal article (peer-reviewed)abstract
- Distributions of simultaneous fiber failures—bursts—in loaded fiber bundles are studied considering inertia and damping. Resulting burst size distributions have universal properties: all approach the power law DΔΔ−2.5 for larger burst sizes Δ. Momentary burst size distributions evolve with increasing damage and do not follow power laws but are still universal. Finally, it is briefly outlined how to use distribution progression to assess damage state.
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23. |
- Brown, Harvey R., et al.
(author)
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Remarks on identical particles in de Broglie-Bohm theory
- 1999
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In: Physics Letters A. - 0375-9601 .- 1873-2429. ; 251:4, s. 229-235
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Journal article (peer-reviewed)abstract
- It is argued that the topological approach to the (anti-) symmetrisation condition for the quantum state of a collection of identical particles, defined in the "reduced" configuration space, is particularly natural from the perspective of de Broglie-Bohm pilot-wave theory.
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24. |
- Dimitrevski, K., et al.
(author)
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Analysis of stable self-trapping of laser beams in cubic-quintic nonlinear media
- 1998
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In: Physics Letters A. - : Elsevier. - 0375-9601 .- 1873-2429. ; 248:5-6, s. 369-376
-
Journal article (peer-reviewed)abstract
- A numerical and analytical analysis of two-dimensional laser beam propagation in cubic-quintic nonlinear optical media demonstrates the existence of stable stationary radially symmetric modes. By means of a variational method, involving super-Gaussian trial functions and Ritz optimization, approximate stationary solutions are obtained, showing very good agreement with numerical results, even in the strongly non-linear, almost saturated, regime. The stability of the stationary modes are verified by analytical analysis and by direct numerical simulations.
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25. |
- Dyakonov, V., et al.
(author)
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Spin-wave resonance in the La0.7Mn1.3O3-delta film
- 2000
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In: Physics Letters A. - 0375-9601 .- 1873-2429. ; 268:3, s. 202-207
-
Journal article (peer-reviewed)abstract
- The spin-wave resonance (SWR) spectra have been observed in the (001) oriented La0.7Mn1.3O3-delta epitaxial films. The spectra consist of a series of well-resolved spin-wave modes clearly seen in the: perpendicular external field configuration. It is shown that the spins are completely pinned on both sides of the film surface. Based on a study of the SWR spectra the value of the spin-wave exchange constant, D, is found to be 150 meV Angstrom(2). This value of. D correlates well with this one determined for all known until now manganites.
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26. |
- Ericsson, Marie, et al.
(author)
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Quantum computation using the Aharonov-Casher set up
- 2002
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In: Physics Letters A. - 0375-9601 .- 1873-2429. ; 303:1, s. 7-10
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Journal article (peer-reviewed)abstract
- It is argued that the Aharonov-Casher set up could be used as the basic building block for quantum computation. We demonstrate explicitly in this scenario one- and two-qubit phase shift gates that are fault tolerant to deformations of the path when encircling two sites of the computational system around each other.
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27. |
- Fasoli, A., et al.
(author)
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Isotope mass scaling of AE damping rates in the JET tokamak plasmas
- 2000
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In: Physics Letters A. - 0375-9601 .- 1873-2429. ; 265:4, s. 288-293
-
Journal article (peer-reviewed)abstract
- The damping of radially extended Alfven eigenmodes in tokamak plasmas is investigated in JET discharges with different ion mass. The comparison of damping measurements with predictions of a gyro-kinetic model indicates that mode conversion into kinetic Alfven waves is the dominant damping mechanism for Alfven eigenmodes in the plasma core.
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28. |
- Ghiu, I., et al.
(author)
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Entanglement-assisted local transformations between inequivalent classes of three-particle entangled states
- 2001
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In: Physics Letters A. - 0375-9601 .- 1873-2429. ; 287:02-jan, s. 12-18
-
Journal article (peer-reviewed)abstract
- We show that bipartite and tripartite entangled states cannot be used as catalysis states to enable local transformations inbetween inequivalent classes of three-particle entangled states which are non-interchangeable under local transformations. We find the optimal protocol for conversion of a certain family of the W-states and an EPR-pair into the GHZ-state.
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29. |
- Kundrotas, P. J., et al.
(author)
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Coulomb correlation gap : Finite-size analysis
- 2001
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In: Physics Letters A. - 0375-9601 .- 1873-2429. ; 287:04-mar, s. 278-282
-
Journal article (peer-reviewed)abstract
- A semiclassical model with randomly distributed N donor and K x N acceptor sites and with infinite-range Coulomb interaction is investigated by means of computer simulations on two-dimensional samples of different sizes. The shape of the Coulomb correlation gap in the density of one-electron excitations g(epsilon) is obtained for different values of K within a wide energy interval around the Fermi energy mu. Using simple scaling arguments we demonstrate that the true behavior of g(epsilon) in the immediate neighborhood of mu is hidden by the finite-size effects and find that g(epsilon) further away from mu is described by a power-law with an exponent, depending on K and the sign of epsilon - mu.
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30. |
- Larsson, Jan-Åke, 1969-
(author)
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Modeling the singlet state with local variables
- 1999
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In: Physics Letters A. - : Elsevier. - 0375-9601 .- 1873-2429. ; 256:4, s. 245-252
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Journal article (peer-reviewed)abstract
- A local-variable model yielding the statistics from the singlet state is presented for the case of inefficient detectors and/or lowered visibility. It has independent errors and the highest efficiency at perfect visibility is 77.80%, while the highest visibility at perfect detector-efficiency is 63.66%. The model cannot be refuted by measurements made to date.
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31. |
- Larsson, Peter, et al.
(author)
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Noncyclic mixed state phase in SU(2) polarimetry
- 2003
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In: Physics Letters A. - 0375-9601 .- 1873-2429. ; 315:1-2, s. 12-15
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Journal article (peer-reviewed)abstract
- We demonstrate that Pancharatnam's relative phase for mixed spin-1/2 states in noncyclic SU(2) evolution can be measured polarimetrically.
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32. |
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33. |
- Osipov, G.V., et al.
(author)
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Impulse control of chaos in continuous systems
- 1998
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In: Physics Letters A. - 0375-9601 .- 1873-2429. ; 247:1-2, s. 119-128
-
Journal article (peer-reviewed)abstract
- Several methods of nonconstant feedback impulse control of chaos are proposed. The approach is based on the similarity of the return maps of dissipative continuous-time systems with one-dimensional maps and has a clear geometrical interpretation. The methods are illustrated for Chua's circuit, the Rossler oscillator, and the phase-locked loop system. (C) 1998 Elsevier Science B.V.
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34. |
- Qiu, Min, et al.
(author)
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FDTD algorithm for computing the off-plane band structure in a two-dimensional photonic crystal with dielectric or metallic inclusions
- 2001
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In: Physics Letters A. - 0375-9601 .- 1873-2429. ; 278:6, s. 348-354
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Journal article (peer-reviewed)abstract
- An effective numerical method based on the finite-difference time-domain scheme for computing the off-plane band structure of a two-dimensional photonic crystal is presented. The method is an order N method, and requires only a two-dimensional discretization mesh for a given off-plant wave number k(z) although thr off-plane propagation is a three-dimensional problem. The computation time and memory required is thus reduced significantly. The present method can be used for any type of inclusions and no additional effort is needed for metallic inclusions. The off-plane band structures of a square lattice of metallic rods in the air are studied, and a complete bandgap for some nonzero off-plane wave number k(z) is found.
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35. |
- Qiu, Min, et al.
(author)
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Guided modes in a two-dimensional metallic photonic crystal waveguide
- 2000
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In: Physics Letters A. - 0375-9601 .- 1873-2429. ; 266:4-6, s. 425-429
-
Journal article (peer-reviewed)abstract
- Guided modes in a two-dimensional metallic photonic crystal waveguide are studied. The guided modes in the photonic crystal waveguide are related to those in a conventional metallic waveguide. There exists a cutoff frequency and consequently a mode gap at low frequencies (starting from zero frequency) in the photonic crystal metallic waveguide.
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36. |
- Qiu, Min, et al.
(author)
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Surface modes in two-dimensional dielectric and metallic photonic band gap structures : a FDTD study
- 2001
-
In: Physics Letters A. - 0375-9601 .- 1873-2429. ; 282:1-2, s. 85-91
-
Journal article (peer-reviewed)abstract
- In the present Letter, surface modes in two-dimensional dielectric and metallic photonic crystals are studied by a finite-difference time-domain method. The existence of surface modes in metallic photonic crystals is examined. The influence of surface waves on dielectric photonic crystal antennas is also studied.
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37. |
- Raadu, Michael A., et al.
(author)
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Test charge response of a dusty plasma with a grain size distribution
- 2002
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In: Physics Letters A. - 0375-9601 .- 1873-2429. ; 305, s. 79-86
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Journal article (peer-reviewed)abstract
- The form of the grain size distribution strongly influences the linear dielectric response of a dusty plasma. For a class of size distributions there is an equivalence to a Lorentzian distribution of mono-sized particles. The electrostatic response to a slowly moving test charge, using a second order approximation, is found. The effects of collisions are investigated.
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38. |
- Rosander, T., et al.
(author)
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Thermal conductivity of Bi to 40 KBAR
- 1969
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In: Physics Letters A. - : Elsevier. - 0375-9601 .- 1873-2429. ; 29:9, s. 517-518
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Journal article (peer-reviewed)abstract
- The thermal conductivity of polycrystalline Bi was determined in cylindrical geometry through three solid phases at 300°K. The thermal and electrical conductivities are compared.
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39. |
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40. |
- Shukla, Padma, et al.
(author)
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Excitation of zonal flows by electron convective cells in a nonuniform dusty magnetoplasma
- 2001
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In: Physics Letters A. - 0375-9601 .- 1873-2429. ; 283:5-6, s. 371-375
-
Journal article (peer-reviewed)abstract
- It is shown that the ponderomotive force of electron convective cells can generate zonal flows (or dust convective cells) in a nonuniform magnetoplasma. For this purpose, two fluid equations are used to derive a pair of coupled equations which govern the nonlinear coupling between electron and dust convective cells. A dispersion relation for the parametric interactions is deduced from the mode coupling equations. Explicit expressions for the growth rates of electron convective cell driven zonal flows are then obtained. The relevance of our investigation to laboratory and space plasmas is pointed out.
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41. |
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42. |
- Sjöqvist, Erik
(author)
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A quantum mechanical angle anholonomy
- 1997
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In: Physics Letters A. - 0375-9601 .- 1873-2429. ; 226:1-2, s. 14-16
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Journal article (peer-reviewed)abstract
- It is shown that adiabatic averaging for a de Broglie-Bohm particle moving on a ring guided by a slowly changing wave function leads to an anholonomic shift.
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43. |
- Sjöqvist, Erik
(author)
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Anandan–Aharonov–Casher oscillations in a simply connected region
- 2000
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In: Physics Letters A. - 0375-9601 .- 1873-2429. ; 270:1-2, s. 10-13
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Journal article (peer-reviewed)abstract
- An entanglement effect between the spin and spatial degrees of freedom of an electrically neutral spin-1/2 particle in a planar electric field is predicted. This nonclassical effect is manifested as spatial interference oscillations in a force free simply connected region of space. It is suggested that these oscillations provide an experimentally accessible analogue of Anandan's "quantum solenoid effect'' [Phys. Lett. A 164 (1992) 369], The effect could be tested with spin polarised atoms.
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44. |
- Sjöqvist, Erik, et al.
(author)
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Fractional statistics in Bohm's theory
- 1995
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In: Physics Letters A. - 0375-9601 .- 1873-2429. ; 202:2-3, s. 160-166
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Journal article (peer-reviewed)abstract
- We introduce fractional statistics in Bohm's formulation of quantum mechanics.
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45. |
- Sjöqvist, Erik, et al.
(author)
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Galilean noninvariance of geometric phase
- 1997
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In: Physics Letters A. - 0375-9601 .- 1873-2429. ; 229:5, s. 273-278
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Journal article (peer-reviewed)abstract
- It is shown that generally geometric phase in nonrelativistic quantum mechanics is not Galilean invariant. It appears, however, that in none of the actual experiments performed to date on geometric phase is the measured phase frame dependent.
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46. |
- Sjöqvist, Erik
(author)
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Proposed interferometry test of noncyclic geometric phase
- 2001
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In: Physics Letters A. - 0375-9601 .- 1873-2429. ; 286:1, s. 4-6
-
Journal article (peer-reviewed)abstract
- An interferometric test of the geometric phase in noncyclic spin-1/2 precession is proposed. It is shown that the resulting interference shift depends only on the noncyclic geometric phase for any opening angle on the Bloch sphere as well as for any degree of polarisation.
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47. |
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48. |
- Tracy, E. R., et al.
(author)
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A ray-based algorithm for multi-dimensional linear conversion
- 2001
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In: Physics Letters A. - 0375-9601 .- 1873-2429. ; 290:06-maj, s. 309-316
-
Journal article (peer-reviewed)abstract
- A numerical algorithm is proposed for connecting the incoming and outgoing wave fields in studies of linear conversion. This is the first such ray-based algorithm for wave conversion in multiple spatial dimensions. It is demonstrated that, aside from the overall phase of the coupling, one can directly evaluate all quantities needed for the connection coefficients from the ray geometry. The ray dynamics is generated using the determinant of the dispersion matrix as the Hamiltonian. Using information available while following an incoming ray, the algorithm automatically detects that the ray has entered a conversion region, evaluates the transmission and conversion coefficients, and launches the transmitted ray. The algorithm does not require any prior knowledge of the geometry of the conversion region. The algorithm is illustrated using a two-dimensional toroidal model with resonant conversion from a magnetosonic to an ion-hybrid wave.
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49. |
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50. |
- Voloshin, V. A., et al.
(author)
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Interplay of structure, magnetism and resistivity of La0.5Ca0.54MnO3+x
- 2000
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In: Physics Letters A. - 0375-9601 .- 1873-2429. ; 271:02-jan, s. 121-127
-
Journal article (peer-reviewed)abstract
- The structure of La0,5Ca0,5MnO3 is well known for T> 250 K and T( 150 K. But in the intermediate region some structure characteristics are difficult to understand [1]. This Letter studies in this temperature region the interrelation between structure and the experimental data like magnetism and resistivity on the basis of a vibron-electron dynamic equilibrium hypothesis. It has been shown that behavior of paramagnetic-to-ferromagnetic transition can be explaned in the framework of this hypothesis.
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