Singlet-triplet anticrossings in /sup 4/He. III. Separation and mixing of the n = 3--8 /sup 1/D and /sup 3/D states

Journal Article · Wed Sep 01 04:00:00 EDT 1976 · Phys. Rev., A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.14.1025· OSTI ID:7268592

Derouard, J; Jost, R; Lombardi, M; Miller, T A; Freund, R S

The method of singlet-triplet anticrossing has been extended to the n /sup 1en-dash/D levels of /sup 4/He with n = 3, 4, and 5. We measure both the zero-field singlet-triplet separation with a higher accuracy than optical measurements, and the antisymmetric part of the spin-orbit coupling between singlet and triplet states. The agreement with many-body perturbation calculations for singlet-triplet intervals and with the hydrogenic approximation for spin-orbit coupling is fairly good even for low-n states. Values of singlet-triplet mixing in the n = 3--8 D states, derived directly from the experimental results, are significantly more accurate than previous experimental and theoretical values. (AIP)

• Research Organization: Laboratoire de Spectrometrie Physique, Universite Scientifique at Medicale de Grenoble, B.P. 53-38041 Grenoble Cedex, France
• OSTI ID: 7268592
• Journal Information: Phys. Rev., A; (United States), Journal Name: Phys. Rev., A; (United States) Journal Issue: 3 Vol. 14:3; 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
COUPLING
CRYOGENIC FLUIDS
D STATES
ELEMENTS
EMISSION SPECTRA
ENERGY LEVELS
EVEN-EVEN NUCLEI
EXCITED STATES
FLUIDS
HELIUM
HELIUM 4
HELIUM ISOTOPES
INTERMEDIATE COUPLING
ISOTOPES
L-S COUPLING
LIGHT NUCLEI
MAGNETIC RESONANCE
MANY-BODY PROBLEM
NONMETALS
NUCLEI
PERTURBATION THEORY
RARE GASES
RESONANCE
SPECTRA
STABLE ISOTOPES