Calculations of generalized oscillator strength for electron-impact excitations of krypton and xenon using a relativistic local-density potential

Journal Article · Tue Sep 01 04:00:00 EDT 1992 · Physical Review A. General Physics; (United States)

DOI:https://doi.org/10.1103/PhysRevA.46.2513· OSTI ID:7026753

Padma, R; Deshmukh, P C ^[1]

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1. Department of Physics, Indian Institute of Technology, Madras 600036 (India)

The generalized oscillator strength (GOS) of an atom is an essential factor in the differential cross section for inelastic scattering of fast charged particles. Recently, Takayanagi {ital et} {ital al}. (Phys. Rev. A 41, 5948 (1990)) have obtained the GOS for the excitation of atomic krypton to the 4{ital p}{sup 5}({sup 2}{ital P}{sub 1/2})5{ital s} and 4{ital p}{sup 5}({sup 2}{ital P}{sub 3/2})5{ital s} states from inelastic-scattering measurements using electron-energy-loss spectroscopy. The present study was undertaken with the twofold objective to determine the results of theoretical computations of the scattering parameters of the above experiment and to examine the suitability of a recently developed relativistic local-density-potential method (M. Vijayakumar, N. Vaidehi, and M. S. Gopinathan, Phys. Rev. A 40, 6834 (1989)) to study atomic-collision processes. Calculations have been done to obtain GOS for electron-krypton and electron-xenon collisions in the squared-momentum-transfer range of 0.01 to 10 atomic units. The well-known theory of Bethe has been used for the determination of the GOS in the first-order Born approximation. The present results are in fair agreement with previous Hartree-Slater and Hartree-Fock calculations and with the experimental data available in the literature. Furthermore, results of the present calculations predict that the GOS goes through a minimum, similar to the Cooper minimum'' in the photoabsorption cross section, as a function of the value of the momentum transfer. Experiments at slightly higher values of momentum transfer are suggested to verify the position of this minimum.

• OSTI ID: 7026753
• Journal Information: Physical Review A. General Physics; (United States), Journal Name: Physical Review A. General Physics; (United States) Vol. 46:5; ISSN 1050-2947; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
COLLISIONS
ELECTRON COLLISIONS
ELECTRON-ATOM COLLISIONS
ELEMENTS
ENERGY-LEVEL TRANSITIONS
EXCITATION
FLUIDS
GASES
INELASTIC SCATTERING
KRYPTON
NONMETALS
OSCILLATOR STRENGTHS
POTENTIALS
RARE GASES
SCATTERING
XENON