Vibrational overtones of gaseous alcohols

Journal Article · Thu Nov 17 04:00:00 EST 1988 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100334a010· OSTI ID:5994713

Fang, H L; Compton, D A.C.

Overtone absorption spectra are reported for gaseous 1-propranol, 2-propranol, and tert-butyl alcohol measured with intracavity photoacoustic and FT-IR spectroscopy. Prominent features in the spectra are assigned as O-H and C-H stretching overtones within the local mode (LM) model of loosely coupled, anharmonic vibrations. Remaining features are assigned as combinations involving an LM overtone and lower frequency motions of molecules. In contrast to C-H and N-H overtones of molecules with comparable sizes, the O-H overtones are considerably narrower and show both rotational and conformational structures. This implies a more isolated nature of the O-H stretching vibration, which leads to possible slower intramolecular vibrational relaxation than other C-H or N-H oscillators. The relatively broad C-H overtones also show evidence of conformationally nonequivalent sites for methyl groups in an anisotropic environment.

• Research Organization: BP America Research and Development, Cleveland, OH (USA)
• OSTI ID: 5994713
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:23; ISSN JPCHA
• Country of Publication: United States
• Language: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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ABSORPTION SPECTROSCOPY
ALCOHOLS
BUTANOLS
DATA
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
FLUIDS
FOURIER TRANSFORM SPECTROMETERS
GASES
HYDROXY COMPOUNDS
INFORMATION
LASERS
MEASURING INSTRUMENTS
MEDIUM TEMPERATURE
NUMERICAL DATA
ORGANIC COMPOUNDS
PHOTOACOUSTIC SPECTROSCOPY
PROPANOLS
SPECTROMETERS
SPECTROSCOPY
VIBRATIONAL STATES