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Nuclear hyperfine interaction of rotating hydrogen: A spectroscopic investigation of hydrogen-OCS van der Waals complexes.
- Source :
- Journal of Chemical Physics; 12/8/2005, Vol. 123 Issue 22, p221106, 4p, 3 Charts, 1 Graph
- Publication Year :
- 2005
-
Abstract
- The rotational spectra of five weakly bonded hydrogen-OCS complexes (paraH<subscript>2</subscript>, orthoH<subscript>2</subscript>, HD, orthoD<subscript>2</subscript>, and paraD<subscript>2</subscript>) are measured. Hyperfine structure is resolved and analyzed in all except the complex with paraH<subscript>2</subscript>, where I=0. For the two j=1 species, orthoH<subscript>2</subscript>-OCS and paraD<subscript>2</subscript>-OCS, nuclear hyperfine coupling constants are found to be d<subscript>a</subscript>=21.2(2) and 8.4(2) kHz, respectively, indicative of nearly free uniaxial rotation of the hydrogen around the b-inertial axis. Similar analyses for HD-OCS and orthoD<subscript>2</subscript>-OCS yield the quadrupole coupling constants eqQ<subscript>a</subscript>=16(2) and 30(2) kHz, respectively, showing that the internal rotational motions of HD and orthoD<subscript>2</subscript> in the complex are slightly hindered producing a small nonspherical distribution. For orthoD<subscript>2</subscript>-OCS, the observed hyperfine structure indicates that the nuclear spin states I=0 and 2 are strongly coupled in the rotation of the complex. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00219606
- Volume :
- 123
- Issue :
- 22
- Database :
- Complementary Index
- Journal :
- Journal of Chemical Physics
- Publication Type :
- Academic Journal
- Accession number :
- 19246611
- Full Text :
- https://doi.org/10.1063/1.2147306