As part of a global analyis of the infrared spectrum of chloromethane, the region of the fifth polyad involving the upper states of seven interacting bands 2υ6, υ₂+υ₃, υ₃+υ₅, 3υ₃, υ₂+υ₆, υ₅+υ₆, 2υ₃+υ₆, from 1900 to 2600 cm^-1 has been re-investigated. More than 20 000 transitions for each isotopomer ¹²CH₃³⁵Cl and ¹²CH₃³⁷Cl have been assigned and fitted with a standard deviation better than 4 10^-4 cm^-1 close to the experimental precision. The present paper is focussed on the determination of the ground state constants of ¹²CH₃³⁷Cl by exploiting in a global theoretical model perturbation-allowed transitions already observed for ¹²CH₃³⁵Cl by Di Lauro and Alamichel (J. Mol. Spectrosc. 81, 390-412 (1980)).

Date Published: 12 January 2004
PDF: 5 pages
Proc. SPIE 5311, 14th Symposium on High-Resolution Molecular Spectroscopy, (12 January 2004); doi: 10.1117/12.545197

Published in SPIE Proceedings Vol. 5311:
14th Symposium on High-Resolution Molecular Spectroscopy
Leonid N. Sinitsa; Semen N. Mikhailenko, Editor(s)