Abstract
About 2500 lines of CH3 35Cl have been assigned. The strong xy Coriolis resonance between thev 2 andv 5 modes is quite visible between thev 4+v ±14 perpendicular band, centered around 4383 cm−1, and thev ±14 +v ±15 perpendicular component, centered around 4475 cm−1, with a crossing of upper energy levels allowing the observation of lines which are normally forbidden. Although not yet observed with certainty, because of the great density of lines of the spectrum, thev ∓14 +v ±15 parallel component is nevertheless detectable by its effects onv 2+v ±14 which is linked by Coriolis resonance to both components ofv 4+v 5. Moreover the spectrum is much complicated by many other resonances with weak bands which occur at level crossings: it is the case ofv 2+3v ±16 , connected tov 2+v ±14 by the well known Darling Dennison resonance which couplesv ±14 and 3v ±16 , and also ofv ±15 +3v ±16 connected tov ±14 +v ±15 by the same resonance; but this last case is complicated by an anharmonic resonance betweenv ±15 +3v ±16 and 2v 3+3v ∓16 . Two more perturbations occur on the ΔK=−1 side ofv 2+v 4: a weak Coriolis resonance gives rise to one subband ofv 1+v 2 at a level crossing withv 2+v 4, and thev 1+v 5 band (linked of course tov 1+v 2 by the Coriolis resonance between thev 2 andv 5 modes) is quite visible and perturbs several subbands ofv 2+v 4 of high values of K through an anharmonic resonance. Moreover, the complex (3v ±15 ,v+2v 05 , 2v 2+v ±15 , 3v 2,v 2+2v ±25 , 3v ±35 ) system of Coriolis-connected bands is linked to the bands studied in the present work by two Fermi resonances: one betweenv 2+2v 05 andv 1+v 2, and the other one betweenv 1+v 5 and 3v ±15 , whose several subbands have been observed on the low part of the spectrum. The values of all the band centres and of the different coupling constants have been estimated, but all these interactions make the line assignments and the interpretation of the spectrum very difficult.
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Bensari-zizi, N., Alamichel, C. Study of the spectrum of CH3 35C1 between 4250 and 4600 CM−1: thev 2+v 4 andv 4+v 5 rovibrational bands. Int J Infrared Milli Waves 10, 137–151 (1989). https://doi.org/10.1007/BF01009123
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DOI: https://doi.org/10.1007/BF01009123