Photoionization and electron-ion recombination: The carbon sequence

Journal Article · Sun Sep 01 04:00:00 EDT 1991 · Physical Review A. General Physics; (United States)

DOI:https://doi.org/10.1103/PhysRevA.44.2935· OSTI ID:5253566

Nahar, S N; Pradhan, A K ^[1]

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1. Department of Astronomy, Ohio State University, Columbus, Ohio (USA)

We describe close-coupling calculations for photoionization and recombination using the {ital R}-matrix method. Photoionization of a large number of bound states of each atom or ion is considered, and cross sections are computed at a fine mesh of energies to delineate the extensive resonance structures. Photoionization of ground and excited configurations with {ital n}{le}10 and {ital l}{le}3 is considered. Partial photoionization cross sections into excited states of the residual ion are also obtained for the ground states of C{sup 0}, N{sup +}, and O{sup 2+}. An important type of autoionizing resonances due to the photoexcitation of the core ion is discussed. As the photoionization cross sections incorporate autoionization in detail, it is possible in principle to employ the Milne relation to obtain total, radiative plus dielectronic, recombination cross sections and rate coefficients. However, practical difficulties arise, and various approaches are described to overcome these. Comparison is made with the earlier results for photoionization cross sections and recombination coefficients. This work forms an extension of the Opacity Project.

• OSTI ID: 5253566
• Journal Information: Physical Review A. General Physics; (United States), Journal Name: Physical Review A. General Physics; (United States) Vol. 44:5; ISSN 1050-2947; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOMS
CARBON
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
ELECTRON COLLISIONS
ELECTRON-ION COLLISIONS
ELEMENTS
ION COLLISIONS
IONIZATION
IONS
ISOELECTRONIC ATOMS
MATRICES
NITROGEN IONS
NONMETALS
OXYGEN IONS
PHOTOIONIZATION
R MATRIX
RECOMBINATION