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 00:00:00 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), Vol. 51:3; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
MULTICHARGED IONS
SPIN
ACCURACY
BERYLLIUM IONS
DIAGNOSTIC TECHNIQUES
ELECTRONIC STRUCTURE
EXCITED STATES
FINE STRUCTURE
FORBIDDEN TRANSITIONS
FREQUENCY MIXING
ISOELECTRONIC ATOMS
LIFETIME
OPTIMIZATION
STELLAR ATMOSPHERES
ANGULAR MOMENTUM
ATMOSPHERES
ATOMS
CHARGED PARTICLES
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
IONS
PARTICLE PROPERTIES
664100* - Theory of Electronic Structure of Atoms & Molecules- (1992-)