Coherence-Converted Population Transfer Ftmw-Ir Double Resonance Spectroscopy of CH3OD in the C-H Stretch Region

Details Coherence-Converted Population Transfer Ftmw-Ir Double Resonance Spectroscopy of CH3OD in the C-H Stretch Region Coherence-Converted Population Transfer Ftmw-Ir Double Resonance Spectroscopy of CH3OD in the C-H Stretch Region

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mss..confefa13t&link_type=abstract

"International Symposium On Molecular Spectroscopy, 65th Meeting, Held 21-25 June, 2010 at Ohio State University. http://molspec

Physics

Infrared/Raman (Vibrational)

Scientific paper

Coherence-converted population transfer microwave-infrared double resonance spectroscopy is employed to record the rotationally state-selected infrared spectra of jet-cooled CH_3OD in the C-H stretch region (2750-3020 cm-1). The observed infrared spectra result from the E-species microwave transitions (1_0 ← 1-1 at 18.957 GHz, 2_0 ← 2-1 at 18.991 GHz, and 3_0 ← 3-1 at 19.005 GHz). The present spectra of CH_3OD contain 17 interacting vibrational bands (J^' = 0). In additional to the three C-H stretch fundamentals (ν_3:2841.7 cm-1, ν_9:2954.4 cm-1 and ν_2:2998.9 cm-1), 14 additional band origins are found in the region of the binary combinations of the CH bends (2890-2950 cm-1). Although the A-species was inaccessible in the present work, the pattern of E-species reduced energies suggests that the torsional tunneling splittings of ν_3 and ν_9 are normal, whereas ν_2 is inverted. The number and distribution of the observed vibrational bands support a stepwise coupling scheme in which the CH stretch bright state couples first to the binary C-H bend combinations, and then to all of the higher order vibrational combinations. A time-dependent interpretation in the asymmetric region indicates a fast (170 fs) initial decay of the bright state.

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