The High-Resolution Fourier Transform Spectrum of Dideuterated Methane CH2D2in the Region between 1900 and 2400 cm−1

✍ Scribed by Oleg N. Ulenikov; Eizi Hirota; Mitsuru Akiyama; S. Alanko; M. Koivusaari; R. Anttila; G. Guelachvili; R.N. Tolchenov

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 569 KB
• Volume: 180
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1996.0266

✦ Synopsis

The infrared spectrum of doubly deuterated methane CH 2 D 2 has been recorded in the region from 1900 to 2400 cm 01 at almost Doppler-limited resolution by using two high-resolution Fourier transform spectrometers. The vibrational bands observed include 2n 4 , n 4 / n 7 , 2n 7 , n 2 , n 8 , n 4 / n 9 , and n 7 / n 9 , which were analyzed by taking into account Coriolis and Fermi interactions among them and also those with n 4 / n 5 , n 3 / n 7 , and n 5 / n 7 . Most of the centrifugal distortion constants were constrained to appropriate values, while the vibrational term value and three rotational constants in each of the seven excited states were adjusted along with Coriolis and Fermi interaction parameters by the leastsquares analysis of the observed spectrum. The vibration-rotation interaction constants a s thus determined for the n 2 and n 8 states were combined with those of other fundamental states already published to calculate the equilibrium C-H distance.