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High resolution Raman spectroscopy of gases with laser sources. XIII —the pure rotational spectra of 1,3,5,7‐cyclooctatetraene and 1,5‐cyclooctadiene
Author(s) -
Thomas P. M.,
Weber A.
Publication year - 1978
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250070614
Subject(s) - chemistry , raman spectroscopy , cyclooctatetraene , analytical chemistry (journal) , spectral line , conformational isomerism , resolution (logic) , spectroscopy , atomic physics , molecule , physics , optics , organic chemistry , quantum mechanics , astronomy , artificial intelligence , computer science
The pure rotational Raman spectra of 1,3,5,7‐cyclooctatetraene (C 8 H 8 ) and 1,5‐cyclooctadiene (C 8 H 12 ) vapor at pressures of 4 and 2 torr, respectively were photographed under high resolution. The 4765 Å, 4880 Å and 5145 Å radiations of a single mode argon ion laser were used to generate the spectra. The molecular constants found from the analysis of the spectra are, for C 8 H 8 : B = 0.090392(15) cm −1 , D J = 1.34(10) × 10 −8 cm −1 and, for C 8 H 12 : B = ½(A + B) = 0.090345(110) cm −1 , D J = 7.12(1.80) × 10 −10 , cm −1 , where the errors are five standard deviations. These constants are averages over the ground state, the low‐lying vibrational states which are sufficiently populated at room temperature, as well as over the possible conformers concurrently present in the sample.