Photoacoustic spectroscopy of vibrational overtones in gas-phase CH/sub 3/OH and CH/sub 3/OD

Journal Article · Thu Feb 02 04:00:00 EST 1984 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j150647a017· OSTI ID:5062170

Fang, H L; Meister, D M; Swofford, R L

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), Journal Name: J. Phys. Chem.; (United States) Vol. 88:3; ISSN JPCHA
• Country of Publication: United States
• Language: English

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ABSORPTION SPECTRA
ALCOHOLS
DEUTERIUM COMPOUNDS
ENERGY LEVELS
EXCITED STATES
FLUIDS
GASES
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
METHANOL
ORGANIC COMPOUNDS
PHOTOACOUSTIC SPECTROSCOPY
SPECTRA
SPECTROSCOPY
VAPORS
VIBRATIONAL STATES