Hyperfine structure of the MnH X sup 7. Sigma. sup + state: A large gas-to-matrix shift in the Fermi contact interaction

Journal Article · Fri Jun 15 04:00:00 EDT 1990 · Journal of Chemical Physics; (USA)

DOI:https://doi.org/10.1063/1.458252· OSTI ID:7097267

Varberg, T D; Field, R W ^[1]; Merer, A J ^[2]

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1. Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (USA)
2. Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, V6T 1Y6 (Canada)

Sub-Doppler spectra of the {ital A} {sup 7}{Pi}--{ital X} {sup 7}{Sigma}{sup +} (0,0) band of gas phase MnH near 5680 A were recorded by intermodulated fluorescence spectroscopy. The spectra reveal hyperfine splittings arising from both the {sup 55}Mn and {sup 1}H nuclear spins. Internal hyperfine perturbations have been observed between the different spin components of the ground state at low {ital N}{double prime}. From a preliminary analysis of several rotational lines originating from the isolated and unperturbed {ital F}{sub 1}({ital J}{double prime}=3) spin component of the {ital X} {sup 7}{Sigma}{sup +}({ital N}{double prime}=0) level, the {sup 55}Mn Fermi contact interaction in the ground state has been measured as {ital b}{sub {ital F}}={ital A}{sub iso} =276(1) MHz. This value is 11% smaller than the value obtained by Weltner {ital et} {ital al}. from an electron-nuclear double resonance (ENDOR) study of MnH in an argon matrix at 4 K. This unprecedented gas-to-matrix shift in the Fermi contact parameter is discussed.

• OSTI ID: 7097267
• Journal Information: Journal of Chemical Physics; (USA), Journal Name: Journal of Chemical Physics; (USA) Vol. 92:12; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ELEMENTS
ENERGY LEVELS
EXCITED STATES
FLUIDS
GASES
HYDRIDES
HYDROGEN
HYDROGEN COMPOUNDS
HYPERFINE STRUCTURE
INTERMEDIATE MASS NUCLEI
ISOTOPES
MANGANESE 55
MANGANESE COMPOUNDS
MANGANESE HYDRIDES
MANGANESE ISOTOPES
MATRIX ISOLATION
NONMETALS
NUCLEI
ODD-EVEN NUCLEI
ROTATIONAL STATES
SPECTRA
STABLE ISOTOPES
TRANSITION ELEMENT COMPOUNDS
VISIBLE SPECTRA