K-SHELL PHOTOIONIZATION OF Na-LIKE TO Cl-LIKE IONS OF Mg, Si, S, Ar, AND Ca

Journal Article · Sat Jan 15 04:00:00 EST 2011 · Astrophysical Journal, Supplement Series

DOI:https://doi.org/10.1088/0067-0049/192/1/7· OSTI ID:21557074

Witthoeft, M C; Garcia, J; Kallman, T R ^[1]; Bautista, M A ^[2]; Mendoza, C ^[3]; Palmeri, P; Quinet, P ^[4]

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1. NASA Goddard Space Flight Center, Code 662, Greenbelt, MD 20771 (United States)
2. Department of Physics, Western Michigan University, Kalamazoo, MI 49008 (United States)
3. Centro de Fisica, Instituto Venezolano de Investigaciones CientIficas (IVIC), Caracas 1020A (Venezuela, Bolivarian Republic of)
4. Astrophysique et Spectroscopie, Universite de Mons-UMONS, B-7000 Mons (Belgium)

We present R-matrix calculations of photoabsorption and photoionization cross sections across the K edge of Mg, Si, S, Ar, and Ca ions with more than 10 electrons. The calculations 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 states up to n = 3. 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 threshold. These data are important for the modeling of features found in photoionized plasmas.

• OSTI ID: 21557074
• Journal Information: Astrophysical Journal, Supplement Series, Journal Name: Astrophysical Journal, Supplement Series Journal Issue: 1 Vol. 192; ISSN 0067-0049; ISSN APJSA2
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ARGON IONS
ATOMIC MODELS
CALCIUM IONS
CHARGED PARTICLES
CROSS SECTIONS
DAMPING
ELECTRONIC STRUCTURE
FUNCTIONS
IONIZATION
IONS
K SHELL
MAGNESIUM IONS
MATHEMATICAL MODELS
MATRICES
PHOTOIONIZATION
POTENTIALS
R MATRIX
SILICON IONS
STATISTICAL MODELS
SULFUR IONS
THOMAS-FERMI MODEL
WAVE FUNCTIONS