Double photoionization of excited [sup 1][ital S] and [sup 3][ital S] states of the helium isoelectronic sequence

Journal Article · Tue Feb 28 23:00:00 EST 1995 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.51.2112· OSTI ID:6545154

Forrey, R C ^[1]; Sadeghpour, H R ^[2]; Baker, J D; Morgan, III, J D ^[3]; Dalgarno, A ^[4]

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1. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138 (United States) Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716 (United States)
2. Institute for Theoretical Atomic and Molecular Physics, Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138 (United States)
3. Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716 (United States)
4. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138 (United States)

We present results for the photoionization of ground and excited [ital S] states of two-electron systems by x-ray photons. The method uses the asymptotic formulation of Dalgarno and Stewart [Proc. Phys. Soc. London 76, 49 (1960)] with highly correlated Frankowski-Pekeris--type wave functions for [ital N] [sup 1]S and [ital N] [sup 3]S initial states. The calculations show a smaller ratio of double-to-single photoionization [ital R] for triplet states due to the spatial antisymmetry of the wave function near the nucleus. We find an asymmetric population of photoion satellite states and provide expressions for the asymptotic single and total photoionization, and [ital R] as a function of nuclear charge. We also make predictions for the differential double photoionization cross sections in the extreme energy sharing case when one electron is ejected with zero energy.

• OSTI ID: 6545154
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 51:3; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

664100* -- Theory of Electronic Structure of Atoms & Molecules-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ATOMS
CHARGED PARTICLES
CROSS SECTIONS
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY LEVELS
EXCITED STATES
EXTRAPOLATION
FLUIDS
FUNCTIONS
GASES
GROUND STATES
HELIUM
IONIZATION
IONIZING RADIATIONS
IONS
ISOELECTRONIC ATOMS
MULTICHARGED IONS
MULTIPLETS
NONMETALS
NUMERICAL SOLUTION
PHOTOIONIZATION
RADIATIONS
RARE GASES
TRIPLETS
WAVE FUNCTIONS
X RADIATION