Spectroscopic investigation of the vibrational quasi-continuum arising from internal rotation of a methyl group. Progress report, September 15, 1990--September 14, 1991
The goal of this project is to use spectroscopic techniques to investigate in detail phenomena involving the vibrational quasicontinuum in a simple physical system. Acetaldehyde was chosen for the study because: (1) methyl groups are known to be important promotors of intramolecular vibrational relaxation; (2) the internal rotation of a methyl group is an easily describable large-amplitude motion, which should retain its simple character even at high levels of excitation, and (3) the aldehyde carbonyl group offers the possibility of both vibrational and electronic probing. The present investigation of the ground electronic state has three parts: (1) understanding the ``isolated`` internal-rotation motion below, at, and above the top of the torsional barrier, (2) understanding in detail traditional vibrational fundamental and overtone states, and (3) understanding interactions involving states with multiquantum excitations of at least one of these two kinds of motion. Progress during the first nine months of this project will be described under these three headings.
- Research Organization:
- National Inst. of Standards and Technology (NML), Gaithersburg, MD (United States). Molecular Physics Div.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AI05-90ER14161
- OSTI ID:
- 10182058
- Report Number(s):
- DOE/ER/14161-1; ON: DE92040509
- Resource Relation:
- Other Information: PBD: [1991]
- Country of Publication:
- United States
- Language:
- English
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