Multiconfigurational-Dirac-Fock calculation of the 2[ital s][sup 2] [sup 1][ital S][sub 0]--2[ital s]2[ital p] [sup 3][ital P][sub 1] spin-forbidden transition for the Be-like isoelectronic sequence

Journal Article · Wed Mar 01 04:00:00 EST 1995 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.51.2020· OSTI ID:6451335

Ynnerman, A; Fischer, C F ^[1]

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1. Computer Science Department, Box 1679 B, Vanderbilt University, Nashville, Tennessee 37235 (United States)

Accurate [ital ab] [ital initio] multiconfigurational-Dirac-Fock (MCDF) calculations of the lifetimes of the spin-forbidden 2[ital s][sup 2] [sup 1][ital S][sub 0]--2[ital s]2[ital p] [sup 3][ital P][sub 1] transition and the allowed 2[ital s][sup 2] [sup 1][ital S][sub 0]--2[ital s]2[ital p] [sup 1][ital P][sub 1] transition in Be-like ions have been performed. The importance of the inclusion of the Breit interaction to obtain accurate fine-structure splittings and mixing coefficients is discussed and the noted discrepancy between the length and velocity gauges for the intercombination line in the lighter ions is addressed. Different optimization procedures are evaluated. For C III the experimental intercombination transition rate has been measured to be 121.9 s[sup [minus]1] with an accuracy of 6%. The current calculation gives 100.3[plus minus]4 s[sup [minus]1], in agreement with other recent calculations.

• OSTI ID: 6451335
• 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
ACCURACY
ANGULAR MOMENTUM
ATMOSPHERES
ATOMS
BERYLLIUM IONS
CHARGED PARTICLES
DIAGNOSTIC TECHNIQUES
ELECTRONIC STRUCTURE
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
FINE STRUCTURE
FORBIDDEN TRANSITIONS
FREQUENCY MIXING
IONS
ISOELECTRONIC ATOMS
LIFETIME
MULTICHARGED IONS
OPTIMIZATION
PARTICLE PROPERTIES
SPIN
STELLAR ATMOSPHERES