Vibration-rotation spectra of CH3F

Smith, W. L. and Mills, I. (1963) Vibration-rotation spectra of CH3F. Journal of Molecular Spectroscopy, 11 (1-6). pp. 11-38. ISSN 0022-2852 doi: 10.1016/0022-2852(63)90003-1

Abstract/Summary

Rotational structure has been resolved and analyzed in the 1049-cm−1 parallel fundamental and the 1182 cm−1 perpendicular fundamental bands in the infrared spectrum of the CH3F molecule. Combination bands at 2223 cm−1 and around 2650 cm−1 have also been studied. The effective resolving power of the spectrometer was 0.25 cm−1 for all these bands. The two long-wavelength fundamentals have been analyzed in much greater detail than in previous work, and a complete analysis of the perpendicular band has been made, including the J-structure in the P and R branches of the sub-bands. Rotational constants of CH3F determined in this work and elsewhere are summarized in Table XIII of the text. Some anomalous intensity perturbations in the rotation lines of the 1182-cm−1 fundamental have been observed, and are discussed.