K-SHELL PHOTOIONIZATION AND PHOTOABSORPTION OF Ne, Mg, Si, S, Ar, AND Ca

Journal Article · Fri May 15 04:00:00 EDT 2009 · Astrophysical Journal, Supplement Series

DOI:https://doi.org/10.1088/0067-0049/182/1/127; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)· OSTI ID:21269170

Witthoeft, M C; Kallman, T R ^[1]; Bautista, M A ^[2]; Mendoza, C ^[3]; Palmeri, P

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1. NASA Goddard Space Flight Center, Code 662, Greenbelt, MD 20771 (United States)
2. Department of Physics, Virginia Polytechnic and State University, Blacksburg, VA 24061 (United States)
3. Centro de Fisica, Instituto Venezolano de Investigaciones CientIficas (IVIC), Caracas 1020A (Venezuela, Bolivarian Republic of)

We present extensive computations of photoabsorption and photoionization cross sections across the K-edge of Ne, Mg, Si, S, Ar, and Ca ions with less than 11 electrons. The calculations are performed using the Breit-Pauli R-matrix method and include the effects of radiative and Auger damping by means of an optical potential. The wave functions are constructed from single-electron orbital bases obtained using a Thomas-Fermi-Dirac statistical model potential. Configuration interaction is considered among all fine-structure levels within the n = 2 complex. The damping processes affect the resonances converging to the K thresholds causing them to display symmetric profiles of constant width that smear the otherwise sharp edge at the photoionization thresholds.

• OSTI ID: 21269170
• Journal Information: Astrophysical Journal, Supplement Series, Journal Name: Astrophysical Journal, Supplement Series Journal Issue: 1 Vol. 182; ISSN 0067-0049; ISSN APJSA2
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ARGON IONS
CALCIUM IONS
CALCULATION METHODS
CONFIGURATION INTERACTION
CROSS SECTIONS
ELECTRONS
FINE STRUCTURE
K SHELL
MAGNESIUM IONS
NEON IONS
PHOTOIONIZATION
R MATRIX
SILICON IONS
STATISTICAL MODELS
SULFUR IONS
THOMAS-FERMI MODEL
WAVE FUNCTIONS