Anisotropic hyperfine interactions of rare-gas nuclei near trapped hydrogen atoms

Journal Article · Thu Mar 15 04:00:00 EST 1979 · J. Chem. Phys.; (United States)

OSTI ID:6324574

Morton, J R; Preston, K F; Strachb, S J; Adrian, F J; Jette, A N

The EPR spectra of hydrogen atoms trapped in xenon and krypton at 10 K have been reinvestigated. Analysis of the anisotropic /sup 129/Xe (enriched), and /sup 83/Kr hyperfine structure shows the H atoms are trapped in the octahedrally symmetric interstitial site (6 nearest neighbors) of the Kr and Xe matrices. For H in Kr, a simple model which considers only overlap of H and Kr orbitals in purely covalent KrxxxH ''molecules'' accounts very well for the observed Kr hyperfine structure and the electronic g factor. To account for the corresponding magnetic constants of H in Xe, however, it is necessary to consider, along with overlap effects, the effects of transfer of electronic charge from the nearest neighbor Xe atoms to the interstitially trapped H atom, as described by admixture of a very small Xe/sup +/xxxH/sup -/ ionic component into the covalent XexxxH ''molecule''. This charge transfer may also be a factor in the surprisingly large differences in the g factors and /sup 129/Xe hyperfine constants of H and D atoms trapped in Xe.

• Research Organization: Division of Chemistry, National Research Council of Canada, Ottawa, Canada
• OSTI ID: 6324574
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 70:6; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ANISOTROPY
ATOMS
CRYOGENIC FLUIDS
DATA
DATA FORMS
ELECTRON SPIN RESONANCE
ELEMENTS
EXPERIMENTAL DATA
FLUIDS
GRAPHS
HYDROGEN
HYPERFINE STRUCTURE
INFORMATION
KRYPTON
MAGNETIC RESONANCE
NONMETALS
NUMERICAL DATA
RARE GASES
RESONANCE
SPECTRA
XENON