Photoacoustic spectroscopy of vibrational overtones in gas-phase CH/sub 3/OH and CH/sub 3/OD
Absorption spectra are reported for gas-phase methanol (10,150-19,900 cm/sup -1/) and methanol-d (10,150-17,600 cm/sup -1/) as seen by intracavity dye laser photacoustic spectroscopy (PAS). Prominent features in the spectra are assigned as O-H, O-D, or C-H stretching overtones within the local-mode (LM) model of loosely coupled, anharmonic vibrations. Relatively less intense peaks are assigned as combinations involving an LM overtone and lower frequency motions (O-H bending and C-O stretching for O-H overtones, and C-H bending for C-H overtones) in the molecule. The O-H overtones show a remarkable amount of spectral detail, which is described in terms of the rotation-vibrational bands of a nearly symmetric top with ''nearly free'' internal rotation about the top axis. The C-H overtones reveal the presence of two types of conformationally nonequivalent bonds owing to the presence of lone-pair electrons on O.
- Research Organization:
- Standard Oil Co., Warrensville Heights, OH
- OSTI ID:
- 5062170
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 88:3
- Country of Publication:
- United States
- Language:
- English
Similar Records
Torsion-vibration interaction in the CH{sub 3}-rocking and OH-bending fundamentals and the CO-stretch overtone band of {sup 13}CH{sub 3}OH
Methyl rotor intramolecular dynamics of gaseous nitromethanes NO{sub 2}CH{sub 3} and NO{sub 2}CH{sub 2}D
Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
DEUTERIUM COMPOUNDS
ABSORPTION SPECTRA
METHANOL
PHOTOACOUSTIC SPECTROSCOPY
VAPORS
VIBRATIONAL STATES
ALCOHOLS
ENERGY LEVELS
EXCITED STATES
FLUIDS
GASES
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
ORGANIC COMPOUNDS
SPECTRA
SPECTROSCOPY
090210* - Alcohol Fuels- Properties- (1976-1989)
400301 - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)