Infrared spectroscopy of jet-cooled tropolone and tropolone-OD in the O-H and C-H stretch region
- Purdue Univ., West Lafayette, IN (United States)
Fluorescence-dip infrared spectroscopy has been employed to record the vibrational spectra of gas phase tropolone and tropolone-OD in the O-H and C-H stretch region for the first time. Tropolone, an pseudo-aromatic ringed system, possesses a symmetric O-H - O tunneling coordinate which produces a ground state tunneling splitting of 0.99 cm{sup -1}. Use of a two laser depletion scheme allows separate infrared spectra to be recorded for both the lower (a{sub 1} symmetry) and upper (b{sub 2} symmetry) ground state tunneling levels. In each spectrum, a single transition ascribable to the O-H stretch is observed. The (a{sub 1}) O-H stretch at 3134.9 cm{sup -1} is close in energy to the (b{sub 2}) O-H stretch observed at 3133.9 cm{sup -1} indicating that the transitions are to the same excited state tunneling level. Tropolone-OD was investigated in order to identify the C-H stretch vibrations which are close in energy to the red-shifted O-H stretch of tropolone. The spectroscopic results along with recent ab initio calculations are discussed in terms of the hydrogen tunneling motion in tropolone.
- OSTI ID:
- 437262
- Report Number(s):
- CONF-9606118--
- Country of Publication:
- United States
- Language:
- English
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