Confinement and correlation effects in the Xe-C{sub 60} generalized oscillator strengths

Journal Article · Thu Dec 15 04:00:00 EST 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.84.063201· OSTI ID:22095626

Amusia, M. Ya. ^[1]; Chernysheva, L. V. ^[2]; Dolmatov, V. K. ^[3]

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1. Racah Institute of Physics, Hebrew University, 91904 Jerusalem (Israel)
2. A. F. Ioffe Physical-Technical Institute, 194021 St. Petersburg (Russian Federation)
3. Department of Physics and Earth Science, University of North Alabama, Florence, Alabama 35632 (United States)

The impact of both confinement and electron correlation on generalized oscillator strengths (GOS's) of endohedral atoms, A-C{sub 60}, is theoretically studied choosing the Xe-C{sub 60} 4d, 5s, and 5p fast electron impact ionization as the case study. Calculations are performed in the transferred to the atom energy region beyond the 4d threshold, {omega}=75-175 eV. The calculation methodology combines the plane-wave Born approximation, Hartree-Fock approximation, and random-phase approximation with exchange in the presence of the C{sub 60} confinement. The confinement is modeled by a spherical {delta}-function-like potential as well as by a square well potential to evaluate the effect of the finite thickness of the C{sub 60} cage on the Xe-C{sub 60} GOS's. Dramatic distortion of the 4d, 5p, and 5s GOS's by the confinement is demonstrated, compared to the free atom. Considerable contributions of multipolar transitions beyond dipole transitions in the calculated GOS's are revealed, in some instances. The vitality of accounting for electron correlation in calculation of the Xe-C{sub 60} 5s and 5p GOS's is shown.

• OSTI ID: 22095626
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 84; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ATOMS
BORN APPROXIMATION
DIPOLES
ELECTRON CORRELATION
ELECTRON-MOLECULE COLLISIONS
ELECTRONS
EV RANGE
FULLERENES
HARTREE-FOCK METHOD
IONIZATION
OSCILLATOR STRENGTHS
RANDOM PHASE APPROXIMATION
SPHERICAL CONFIGURATION
SQUARE-WELL POTENTIAL
XENON