τ-Clustering for molecules with large torsional splittings: the ν7+ν8 and 2ν8 combination and overtone bands of CH3OH

Autor:	Brenda P. Winnewisser, M. Abbouti Temsamani, Mahmoud Mollabashi, Li-Hong Xu, Ronald M. Lees, M Lock
Rok vydání:	2001
Předmět:	Chemistry Infrared Molecular vibration Overtone Analytical chemistry General Physics and Astronomy Molecule Infrared spectroscopy Physical and Theoretical Chemistry Cluster analysis Molecular physics Fourier transform spectroscopy Line (formation)
Zdroj:	Chemical Physics Letters. 347:383-389
ISSN:	0009-2614
DOI:	10.1016/s0009-2614(01)01062-4
Popis:	Line clustering into two groups of differing τ torsional symmetries is considered for parallel infrared vibrational bands of 3-fold internal rotor molecules with large torsional splittings, such as methanol. In bands involving large changes in torsional parameters, the τ -clustering produces a distinctive pair of Q-branch peaks in the low-resolution spectrum. The origin of the τ -clustering and the formation of the twin Q-branch peaks are discussed together with new subband assignments in Fourier transform spectra of the ν 7 + ν 8 CH 3 -rock/CO-stretch combination and 2 ν 8 CO-stretching overtone bands of CH 3 OH, which are good representatives of large and small changes in torsional parameters, respectively.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b469b138ab23f374ccbe7f2e129325c1 https://doi.org/10.1016/s0009-2614(01)01062-4 Zobrazit plný text záznamu Full Text from ScienceDirect