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Träfflista för sökning "WAKA:ref srt2:(1965-1979)"

Sökning: WAKA:ref > (1965-1979)

  • Resultat 101-110 av 3258
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101.
  • Almbladh, Carl-Olof, et al. (författare)
  • Interpretation of high-energy X-ray satellites of L2,3 emission bands of Na, Mg, Al and Si
  • 1975
  • Ingår i: Journal of Physics C: Solid State Physics. - 0022-3719. ; 8:23, s. 4117-4123
  • Tidskriftsartikel (refereegranskat)abstract
    • The high-energy satellite of the L2,3 X-ray emission band in Na, Mg, Al and Si has for a long time been attributed to the decay of an initial state with two holes in the 2p shell. In particular, the satellite threshold has been assigned to an initial (2p2)1D state. It has recently been found that X-ray and Auger data give two different values for the energy of this doubly-ionized state, and attempts have been made to interpret this difference in terms of localized valence states. The authors have re-examined the interpretation of the L2,3, satellite using data on K and L2,3 satellites, Auger and radiative Auger KLL spectra. It is concluded that the L2,3 satellite originates from an initial (2p2)3P state, contrary to previous assumptions.
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102.
  • Almbladh, Carl-Olof, et al. (författare)
  • On the thermal broadening of core levels in metals due to many‐electron effects
  • 1978
  • Ingår i: Physica Status Solidi (B). ; 85:1, s. 135-143
  • Tidskriftsartikel (refereegranskat)abstract
    • Ferrell's expression for the XPS lineshape is derived in a formalism which explicitly takes the electron—electron interaction into account. Also the corresponding expression for X-ray absorption is given. In the presence of other broadenings, which are comparable or larger than kT, the electronic part of the core-level broadening in XPS is indistinguishable from a Gaussian. This Gaussian broadening is of the same order as the expected phonon broadening for Al at room temperature and above, but it is of little importance for Li and Na. In X-ray absorption, the effect seems in some cases to be important when extracting phonon broadenings from experimental data.
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103.
  • Almbladh, Carl-Olof, et al. (författare)
  • Screening of a proton in an electron gas
  • 1976
  • Ingår i: Physical Review B. - 1550-235X. ; 14:6, s. 2250-2254
  • Tidskriftsartikel (refereegranskat)abstract
    • Calculations are reported of the nonlinear screening of a proton in an electron gas of densities corresponding to rs=1-6. Results for charge densities and total energies are presented from self-consistent Kohn-Sham ground-state calculations. The results differ markedly from the case of linear screening, particularly at low densities. The occurrence of a bound state around the proton for rs>1.9 indicates that hydrogen in jellium is in the form of a screened H- ion. It is also found that at metallic densities the induced polarization around the proton is insensitive to rs, and the screening length is almost constant (0.65) for 2
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104.
  • Almbladh, Carl-Olof, et al. (författare)
  • The spherical-solid model: An application to x-ray edges in Li, Na, and Al
  • 1976
  • Ingår i: Physical Review B. - 1550-235X. ; 13:8, s. 3307-3319
  • Tidskriftsartikel (refereegranskat)abstract
    • In order to treat highly localized excitations in a solid a simple spherical model has been developed. The Coulomb potential from the nucleus at the site of the excitation is treated exactly, while the potentials from the surrounding sites are turned into pseudoion pontentials. Only the spherical average of these potentials is retained and separate self-consistent calculations for the ground state and for the excited state are made. These states are mistreated by the model but the difference accurately describes the large effects of polarization involved. The positions of the x-ray edges are obtained with an accuracy of 0.5 eV for singly ionized levels and 1 eV for doubly ionized levels. The phase shifts relevant to the Nozières-De Dominicis theory of x-ray absorption and emission edges and x-ray photoemission line shapes are also calculated. We obtain a noticeable many-body enhancement of the L2,3 edge in Na while the many-body effect in Li and Al is negligible. Our exponents agree with those extracted from recent x-ray photoemission experiments, but they do not agree with those extracted from x-ray emission or absorption spectra. We argue that the exponents taken from the photoemission experiment are more reliable but no definite conclusion concerning the validity of the present many-body theory should be drawn until the experimental situation has become more clear.
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105.
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106.
  • Almlöf, Jan (författare)
  • Hydrogen bond studies. 71. Ab initio calculation of the vibrational structure and equilibrium geometry in HF−2 and DF−2
  • 1972
  • Ingår i: Chemical Physics Letters. - 0009-2614 .- 1873-4448. ; 17:1, s. 49-52
  • Tidskriftsartikel (refereegranskat)abstract
    • MO LCAO SCF calculations have been performed to investigate the molecular astructure and vibrational spectrum of the bifluoride ion in its normal and deuterated form. The potential energy for nuclear motions has been evaluated as a function of the molecular degrees of freedom, taking only linear geometries into account. The vibrational Schrödinger equation has been solved by expanding the vibrational part of the total wavefunction as a sum of products of linear harmonic-oscillator eigenfunctions. The calculated properties are in good agreement with experiments, and even the minute effects of deuteration are well reproduced.
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107.
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108.
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109.
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110.
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Nordén, Bengt, 1945 (84)
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