Spin-torsion effects in the hyperfine structure of methanol

The magnetic hyperfine structure of the non-rigid methanol molecule is investigated experimentally and theoretically. 12 hyperfine patterns are recorded using molecular beam microwave spectrometers. These patterns, along with previously recorded ones, are analyzed in an attempt to evidence the effec...

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Bibliographic Details
Published in:The Journal of chemical physics 2015-07, Vol.143 (4), p.044304-044304
Main Authors: Coudert, L H, Gutlé, C, Huet, T R, Grabow, J-U, Levshakov, S A
Format: Article
Language:English
Subjects:
ABSORPTION SPECTROSCOPY
AMPLITUDES
Atmospheric and Oceanic Physics
Chemical Physics
Chemical Sciences
HAMILTONIANS
HYPERFINE STRUCTURE
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
J-J COUPLING
METHANOL
MICROWAVE RADIATION
MOLECULAR BEAMS
MOLECULES
or physical chemistry
PAULI PRINCIPLE
Physics
Quantum Physics
ROTATION
SPIN
Theoretical and
TORSION
WAVE FUNCTIONS
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Summary:The magnetic hyperfine structure of the non-rigid methanol molecule is investigated experimentally and theoretically. 12 hyperfine patterns are recorded using molecular beam microwave spectrometers. These patterns, along with previously recorded ones, are analyzed in an attempt to evidence the effects of the magnetic spin-torsion coupling due to the large amplitude internal rotation of the methyl group [J. E. M. Heuvel and A. Dymanus, J. Mol. Spectrosc. 47, 363 (1973)]. The theoretical approach setup to analyze the observed data accounts for this spin-torsion in addition to the familiar magnetic spin-rotation and spin-spin interactions. The theoretical approach relies on symmetry considerations to build a hyperfine coupling Hamiltonian and spin-rotation-torsion wavefunctions compatible with the Pauli exclusion principle. Although all experimental hyperfine patterns are not fully resolved, the line position analysis yields values for several parameters including one describing the spin-torsion coupling.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.4926942