Spectroscopic investigation of the vibrational quasi-continuum arising from internal rotation of a methyl group

Conference · Wed Dec 01 04:00:00 EST 1993

OSTI ID:139888

Hougen, J T ^[1]

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1. NIST, Gaithersburg, MD (United States)

The goal of this project is to use spectroscopic techniques to investigate in detail phenomena involving the vibrational quasi-continuum in a simple physical system. Acetaldehyde was chosen for the study because: (i) methyl groups have been suggested to be important promotors of intramolecular vibrational relaxation, (ii) the internal rotation of a methyl group is an easily describle large-amplitude motion, which should retain its simple character even at high levels of excitation, and (iii) 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 {open_quotes}isolated{close_quotes} internal-rotation motion below, at, and above the top of the torsional barrier, (2) understanding in detail traditional (bond stretching and bending) vibrational fundamental and overtone states, and (3) understanding interactions involving states with multiquantum excitations of at least one of these two kinds of motion.

• Research Organization: Brookhaven National Lab., Upton, NY (United States)
• OSTI ID: 139888
• Report Number(s): BNL--48923; CONF-9306172--; ON: DE93015758
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
ACETALDEHYDE
EXCITATION
GROUND STATES
LASER SPECTROSCOPY
RELAXATION
ROTATIONAL STATES
VIBRATIONAL STATES