Fourier transform spectra and torsion–rotation structure of the CO-stretching 2ν8 overtone and 2ν8–ν8 hot band of CH3OH

Download
  1. Get@NRC: Fourier transform spectra and torsion–rotation structure of the CO-stretching 2ν8 overtone and 2ν8–ν8 hot band of CH3OH (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1016/j.molstruc.2003.10.051
AuthorSearch for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for:
TypeArticle
Journal titleJournal of Molecular Structure
Volume695-696
Pages129144; # of pages: 16
SubjectCoriolis coupling; CO-stretching; Fourier transform infrared spectra; Internal rotation; Level-crossing resonances; Methanol
AbstractThe Fourier transform infrared (FTIR) spectrum of the 2[nu]8 overtone band of the CO-stretching vibrational mode of CH3OH has been investigated in the 5-[mu]m region at a spectral resolution of 0.0048 cm-1 (1/MOPD) and a higher pressure-path-length product than heretofore. Assignments are reported for high-K 2[nu]8 subbands in the ground state (n=0) of the [nu]12 torsion, and for 2[nu]8+[nu]12-[nu]12 (n=1) and 2[nu]8+2[nu]12-2[nu]12 (n=2) torsionally excited combination subbands. Upper-state [upsilon]8=2 term values have been fitted to series expansions in powers of J(J+1) to obtain J-independent substate origins defining the torsion-K-rotation structure of the overtone state. Perturbations due to Coriolis and asymmetry resonances have been observed and characterized, as well as J-localized level-crossing resonances arising principally from interactions with the [upsilon]7=2 overtone state of the in plane CH3-rocking mode and the ([upsilon]7,[upsilon]8)=(1,1) combination state. Differences between [upsilon]8=2 and [upsilon]8=1 term values have been used to generate a predicted map of the weak 2[nu]8-[nu]8 CO-stretching hot band. The hot band underlies the main [nu]8 fundamental in the 10-[mu]m region, so is of significance to the determination of the fundamental line intensities. A number of the weak hot-band lines have been observed in the 10-[mu]m FTIR spectrum.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Steacie Institute for Molecular Sciences
Peer reviewedNo
NPARC number12328008
Export citationExport as RIS
Report a correctionReport a correction
Record identifier16fb114d-1a38-46f1-aa20-46278684a147
Record created2009-09-10
Record modified2016-05-09
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)