TITLE

High resolution infrared spectroscopy of cyclobutane: A study of vibrational mode coupling involving large amplitude, low frequency modes

AUTHOR(S)
Li, H.; Miller, C. Cameron; Philips, Laura A.
PUB. DATE
June 1994
SOURCE
Journal of Chemical Physics;6/15/1994, Vol. 100 Issue 12, p8590
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The high resolution IR spectrum of cyclobutane in a supersonic molecular beam was obtained for the region of 2981 to 2991 cm-1. The spectrum reveals four overlapping bands suggestive of vibrational mode coupling in the C–H stretching region. Ground state combination differences demonstrate that these bands originate from two different ground states, the symmetric and asymmetric ring puckering states. Evidence of vibrational mode coupling is present in all four bands. The coupling depends on both J and the symmetry of the puckering state. A model coupling scheme involving two qualitatively different types of couplings is developed to explain the observed spectrum. Symmetry restrictions and the interaction between molecular rotation and ring puckering qualitatively accounts for the dramatically different coupling behavior between the two ring puckering states.
ACCESSION #
7641802

 

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