Effective collision strengths among fine-structure levels of Ca XV

Journal Article · Sun Apr 01 00:00:00 EST 1990 · Astrophysical Journal, Supplement Series; (USA)

DOI:https://doi.org/10.1086/191435· OSTI ID:6699657

Aggarwal, K M; Berrington, K A; Keenan, F P ^[1]

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1. Belfast Queen's Univ. (Northern Ireland)

The R-matrix program is used to calculate collision strengths Omega for 190 fine-structure transitions among the 1s2 2s2 2p2, 1s2 2s 2p3, and 1s2 2p4 configurations of Ca XV in the energy range of 0-100 Ry. Relativistic effects are included in the computations of Omega through term coupling coefficients. The effective collision strengths Tau, obtained by averaging Omega over a Maxwellian distribution of electron velocities, are listed for all transitions in the temperature range of 10 to the 6th to 10 to the 7th K. The effects on the calculated Omega and Tau values of term coupling and configuration-interaction in the target are examined, and the importance of including relativistic effects is noted, particularly for spin and parity changing transitions at the higher energies and temperatures. 35 refs.

• OSTI ID: 6699657
• Journal Information: Astrophysical Journal, Supplement Series; (USA), Vol. 72; ISSN 0067-0049
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CALCIUM IONS
ENERGY-LEVEL TRANSITIONS
SOLAR FLARES
ENERGY LEVELS
FINE STRUCTURE
GROUND STATES
RELATIVISTIC RANGE
SCATTERING
WAVE FUNCTIONS
CHARGED PARTICLES
ENERGY RANGE
FUNCTIONS
IONS
SOLAR ACTIVITY
640104* - Astrophysics & Cosmology- Solar Phenomena