Electron affinities of opposite-parity bound states in Th[sup [minus]]: Relativistic-configuration-interaction studies

Journal Article · Mon Aug 01 04:00:00 EDT 1994 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.50.1107· OSTI ID:7270739

Datta, D; Beck, D R ^[1]

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1. Physics Department, Michigan Technological University, Houghton, Michigan 49931 (United States)

Recent studies indicate that several bound states exist for some negative ions of the lanthanides. In this work we demonstrate that the second member of the actinide series, Th, also possesses multiple negative ion states below its ground state, consistent with the relatively high yield observed in the laboratory. Our valence space relativistic-configuration-interaction calculations predict the strongest bindings for Th[sup [minus]] 6[ital d][sup 2]7[ital s][sup 2]7[ital p] [ital J]=2.5 and Th[sup [minus]] 6[ital d][sup 3]7[ital s][sup 2] [ital J]=1.5 with electron affinities (EA) of 0.365 and 0.189 eV, respectively. We also expect certain weaker candidates to exist with ([ital J][sup ([pi])], EA (eV)): (0.5[sup ([minus])],0.088), (1.5[sup ([minus])],0.075), (3.5[sup ([minus])],0.042), and (2.5[sup (+)],0.056), where [pi]=+ ([minus]) corresponds to even (odd) parity states.

• OSTI ID: 7270739
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 50:2; 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
AFFINITY
ANIONS
BOUND STATE
CALCULATION METHODS
CHARGED PARTICLES
CONFIGURATION INTERACTION
CORRELATIONS
ELECTRON CORRELATION
ENERGY RANGE
IONS
PARITY
PARTICLE PROPERTIES
RELATIVISTIC RANGE
THORIUM IONS