| 1. |
- Boström, Mathias, et al.
(författare)
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Comment on "Calculation of the Casimir force between imperfectly conducting plates"
- 2000
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Ingår i: Physical Review A. Atomic, Molecular, and Optical Physics. - 1050-2947 .- 1094-1622. ; 61:4
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- In a recent paper [Phys. Rev. A 59, R3149 (1999)] Lamoreaux reported calculations of the Casimir force. The experimentally found permittivity was used in the calculations. Large deviations were found between numerically evaluated forces and forces derived from a series expanded plasma model. We would like to comment on a few results presented in this work. First, we claim that important features of the imaginary component of the permittivity of copper, presented in Fig. 1(a) are due to the interpolation procedure and are not caused by physical phenomena. These features influence the calculated permittivity for imaginary frequencies, which is the quantity used to calculate the Casimir attraction. Second, we discuss the extrapolation procedure used for low frequencies. The results depend substantially on how this extrapolation is performed.
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| 2. |
- Calderaro, Luca, et al.
(författare)
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Vortex dynamics in coherently coupled Bose-Einstein condensates
- 2017
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Ingår i: Physical Review A. Atomic, Molecular, and Optical Physics. - 1050-2947 .- 1094-1622. ; 95:2
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- In classical hydrodynamics with uniform density, vortices move with the local fluid velocity. This description is rewritten in terms of forces arising from the interaction with other vortices. Two such positive straight vortices experience a repulsive interaction and precess in a positive (anticlockwise) sense around their common centroid. A similar picture applies to vortices in a two-component two-dimensional uniform Bose-Einstein condensate (BEC) coherently coupled through rf Rabi fields. Unlike the classical case, however, the rf Rabi coupling induces an attractive interaction and two such vortices with positive signs now rotate in the negative (clockwise) sense. Pairs of counter-rotating vortices are instead found to translate with uniform velocity perpendicular to the line joining their cores. This picture is extended to a single vortex in a two-component trapped BEC. Although two uniform vortex-free components experience familiar Rabi oscillations of particle-number difference, such behavior is absent for a vortex in one component because of the nonuniform vortex phase. Instead the coherent Rabi coupling induces a periodic vorticity transfer between the two components.
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| 3. |
- Laestadius, Andre, 1984-, et al.
(författare)
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Non-existence of a Hohenberg-Kohn Variational Principle in Total Current Density Functional Theory
- 2015
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Ingår i: Physical Review A. Atomic, Molecular, and Optical Physics. - 1050-2947 .- 1094-1622. ; 91:3
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- For a many-electron system, whether the particle density rho and the total current density j are sufficient to determine the one-body potential V and vector potential A, is still an open question. For the one-electron case, a Hohenberg-Kohn theorem exists formulated with the total current density. Here we show that the generalized Hohenberg-Kohn energy functional E_{V_0,A_0}(rho,j) = can be minimal for densities that are not the ground-state densities of the fixed potentials V_0 and A_0. Furthermore, for an arbitrary number of electrons and under the assumption that a Hohenberg-Kohn theorem exists formulated with rho and j, we show that a variational principle for Total Current Density Functional Theory as that of Hohenberg-Kohn for Density Functional Theory does not exist. The reason is that the assumed map from densities to the vector potential, written (rho,j) -> A(rho,j;x), enters explicitly in E_{V_0,A_0}(rho,j).
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| 4. |
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| 5. |
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| 6. |
- AUSMEES, A, et al.
(författare)
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OBSERVATION OF ANOMALOUS BEHAVIOR OF THE XE 4D PHOTOELECTRON SATELLITES
- 1995
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Ingår i: PHYSICAL REVIEW A. - : AMER INST PHYSICS. - 1050-2947. ; 52:4, s. 2943-2947
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The Xe 4d photoelectron satellites have been studied in the photon energy region 90-200 eV. The substantially improved energy resolution has enabled us to determine a wealth of satellites. A comparison of the satellite spectra at the intermediate excitati
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| 7. |
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| 8. |
- Bliman, S, et al.
(författare)
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Collision spectroscopy of Ar8++H-2 at low velocities (upsilon < 1 a.u.)
- 1999
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Ingår i: PHYSICAL REVIEW A. - : AMERICAN PHYSICAL SOC. - 1050-2947. ; 60:4, s. 2799-2807
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Single and double electron transfer have been studied for the collision system Ar8++H-2 at low velocities (V<1 a.u.). X-ray ultraviolet and Auger spectroscopies complemented by translational energy gain and time-of-flight spectroscopies reveal details on
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| 9. |
- Carlsen, H, et al.
(författare)
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Dynamics of particles for circular Rydberg states
- 1999
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Ingår i: PHYSICAL REVIEW A. - 1050-2947. ; 59:2, s. 1063-1069
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The dynamics of circular Rydberg wave packets for the hydrogen atom with particular emphasis on fractional and full revivals previously studied by Gaeta and Stroud [Phys. Rev. A 42, 6308 (1990)], is developed within the de Broglie-Bohm pilot-wave theory.
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| 10. |
- Carravetta, V, et al.
(författare)
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Excitation-energy-dependent resonant photoemission: C1s-pi* spectra of carbon monoxide
- 1997
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Ingår i: PHYSICAL REVIEW A. - : AMER INST PHYSICS. - 1050-2947. ; 56:6, s. 4665-4674
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- High-resolution measurements of the x-ray resonant photoemission of CO near the C1s-->pi* transition are presented. The branching ratios for the valence shell ionization close to the resonance how a strong dependence on the photon energy with a clear asym
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