Electron affinity of helium (1s2s) /sup 3/S

Journal Article · Thu Feb 01 04:00:00 EST 1979 · Phys. Rev., A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.19.452· OSTI ID:6462499

Bunge, A V; Bunge, C F

A configuration-interaction calculation with a carefully optimized orbital basis gives an upper bound E/sub u/ = -2.178 040 a.u. (He) for the nonrelativistic energy E/sub n/r of the (1s2s2p) /sup 4/P/sup 0/ metastable state of the He negative ion. Extensive studies of patterns of convergence for the energy show that E/sub n/r = -2.178 074(10), which together with Pekeris' accurate E/sub n/r He (1s2s) /sup 3/S yields a nonrelativistic electron affinity A/sub n/r = 77.4(3) meV. It is argued that the true electron affinity should not differ from A/sub n/r by more than +- 0.2 meV. Good agreement with the less-precise experimental values is obtained. The present results, by allowing a recalibration of the experiments, will permit a significant increase in the accuracy of future experimental determinations of electron affinities below 300 meV.

• Research Organization: Departamento de Quimica, Universidad Autonoma Metropolitana, Apartado 55-532, Iztapalapa, Mexico 13, D.F., Mexico
• OSTI ID: 6462499
• Journal Information: Phys. Rev., A; (United States), Journal Name: Phys. Rev., A; (United States) Vol. 19:2; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
AFFINITY
ANIONS
ATOMIC IONS
ATOMIC MODELS
CHARGED PARTICLES
CONFIGURATION INTERACTION
CRYOGENIC FLUIDS
ELECTRONEGATIVITY
ELEMENTS
ENERGY LEVELS
EXCITED STATES
FLUIDS
HELIUM
HELIUM IONS
IONS
MATHEMATICAL MODELS
METASTABLE STATES
NONMETALS
RARE GASES