Photoionization of the outer shells of radon and radium: Relativistic random-phase approximation for high- Z atoms

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

DOI:https://doi.org/10.1103/PhysRevA.45.6339· OSTI ID:7235063

Deshmukh, P C ^[1]; Radojevic, V ^[2]; Manson, S T ^[3]

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1. Department of Physics, Indian Institute of Technology, Madras 600036 (India)
2. Department of Physics, Marmara University, 81040 Fikirtepe, Istanbul (Turkey)
3. Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303 (United States)

Photoionization cross sections, branching ratios, and photoelectron angular distributions have been calculated for Ra ({ital Z}=88) 7{ital s}, 6{ital p}, 6{ital s}, 5{ital d}, and 5{ital p}, and Rn ({ital Z}=86) 6{ital p}, 6{ital s}, 5{ital d}, and 5{ital p} subshells within the framework of the relativistic random-phase approximation, including coupling between all of the relativistic channels arising from these subshells, in an effort to elucidate the interplay between relativistic and interchannel interactions at high {ital Z} where no experiments are extant. The results show that, aside from inducing structure in subshell cross sections, relativistic plus interchannel effects dominate the photoelectron angular-distribution asymmetry parameter and the branching ratio between spin-orbit doublets largely through the relativistic splitting of Cooper minima. This qualitatively confirms effects predicted by simple central-field calculations. Detailed explanations of the reasons for each of the structures are presented.

• OSTI ID: 7235063
• Journal Information: Physical Review A. General Physics; (United States), Journal Name: Physical Review A. General Physics; (United States) Vol. 45:9; ISSN 1050-2947; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

664100* -- Theory of Electronic Structure of Atoms & Molecules-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ALKALINE EARTH METALS
ANGULAR DISTRIBUTION
ASYMMETRY COEFFICIENTS
ATOMIC NUMBER
COUPLING
CROSS SECTIONS
DISTRIBUTION
ELEMENTS
EMISSION
ENERGY RANGE
FLUIDS
GASES
INTERMEDIATE COUPLING
IONIZATION
L-S COUPLING
METALS
NONMETALS
PHOTOEMISSION
PHOTOIONIZATION
RADIUM
RADON
RANDOM PHASE APPROXIMATION
RARE GASES
RELATIVISTIC RANGE
SECONDARY EMISSION
VALENCE