Coupling of CH stretching and bending vibrations in trihalomethanes

Journal Article · Mon Jun 01 00:00:00 EDT 1987 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.452486· OSTI ID:6605549

Wong, J S; Green, Jr, W H; Cheng, C; Moore, C B

The vibrational spectra of HCCl/sub 3/, HCF/sub 3/, HCCl/sub 2/F, and HCClF/sub 2/ have been measured in the vapor from the CH stretching fundamental through to the fifth overtone (i.e., v/sub 1/ = 6, where v/sub 1/ is the number of quanta in the CH stretching mode), using FTIR and photoacoustic spectrometers. Instead of a single strong CH overtone progression, additional strong bands attributable to Fermi-resonant combination tones are prominent in the spectra. The CH stretch is found to be most strongly coupled to the CH bending mode and much less strongly coupled to the heavy atom motions. The resolved band structures are analyzed in the following paper to give quantitative stretch--bend coupling constants for these CH oscillators.

• Research Organization: Materials and Molecular Research Division of the Lawrence Berkeley Laboratory and Department of Chemistry, University of California, Berkeley, California 94720
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6605549
• Journal Information: J. Chem. Phys.; (United States), Vol. 86:11
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
74 ATOMIC AND MOLECULAR PHYSICS
CHLOROFORM
INFRARED SPECTRA
VIBRATIONAL STATES
FLUOROFORM
HALOGENATED ALIPHATIC HYDROCARBONS
COUPLING CONSTANTS
ENERGY TRANSFER
FOURIER TRANSFORM SPECTROMETERS
CHLORINATED ALIPHATIC HYDROCARBONS
ENERGY LEVELS
EXCITED STATES
FLUORINATED ALIPHATIC HYDROCARBONS
MEASURING INSTRUMENTS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
SPECTRA
SPECTROMETERS
400500* - Photochemistry
640302 - Atomic
Molecular & Chemical Physics- Atomic & Molecular Properties & Theory