Novel Patterns of Torsion - Inversion Tunneling and Torsion - Rotation Coupling in the ν11 CH - Stretch Region of CH_3NH_2

Details Novel Patterns of Torsion - Inversion Tunneling and Torsion - Rotation Coupling in the ν11 CH - Stretch Region of CH_3NH_2 Novel Patterns of Torsion - Inversion Tunneling and Torsion - Rotation Coupling in the ν11 CH - Stretch Region of CH_3NH_2

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011mss..confewi03d&link_type=abstract

"International Symposium On Molecular Spectroscopy, 66th Meeting, Held 20-24 June, 2011 at Ohio State University. http://molspec

Physics

Mini-Symposium: Spectroscopic Perturbations

Scientific paper

The high-resolution infrared spectrum of CH_3NH_2 hasbeen recorded using slit-jet absorption spectroscopy in the ν11 asymmetric CH-stretch region (2965 to 3005 Cm-1) with resolution of 0.003 Cm-1. The 580 lines, assigned by ground state combination differences, represent 27 subbands with |K'| ≤ 2 for the A, B, E_1 and E_2 symmetries. Several of the observed subbands are split by perturbations. The analysis of spectrum shows that the patterns of the torsion-inversion tunneling splittings are qualitatively different from the ground state. In addition, the low - J splittings between |K'| = +|K'| and -|K'| are greatly reduced relative to the ground state in both the E_1 and the E_2 species, indicating that torsion-rotation coupling is suppressed in the ν11 CH-stretch excited state.

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