Hyperfine structure of the MnH X sup 7. Sigma. sup + state: A large gas-to-matrix shift in the Fermi contact interaction
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (USA)
- 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), Vol. 92:12; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HYDROGEN
HYPERFINE STRUCTURE
MANGANESE 55
MANGANESE HYDRIDES
VISIBLE SPECTRA
GASES
MATRIX ISOLATION
ROTATIONAL STATES
ELEMENTS
ENERGY LEVELS
EXCITED STATES
FLUIDS
HYDRIDES
HYDROGEN COMPOUNDS
INTERMEDIATE MASS NUCLEI
ISOTOPES
MANGANESE COMPOUNDS
MANGANESE ISOTOPES
NONMETALS
NUCLEI
ODD-EVEN NUCLEI
SPECTRA
STABLE ISOTOPES
TRANSITION ELEMENT COMPOUNDS
640302* - Atomic
Molecular & Chemical Physics- Atomic & Molecular Properties & Theory