High resolution FTIR spectroscopy of 1,1,1,2-tetrafluoroethane:

✍ Scribed by Christopher D. Thompson; Evan G. Robertson; Corey J. Evans; Don McNaughton

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 129 KB
• Volume: 218
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1016/s0022-2852(02)00079-6

✦ Synopsis

High resolution FTIR spectra of 1,1,1,2-tetrafluoromethane (R134a) were recorded using both an enclosive flow cell and a supersonic jet expansion. The temperature in the collisionally cooled enclosive flow was approximately 150 K, whilst in the jet a rotational temperature of 65 K was achieved. A rovibrational analysis was performed for m 6 , an a=b hybrid band at 1104:5 cm À1 . Least squares fits were used to derive effective rotational and centrifugal distortion constants for m 6 using a total of 799 assigned transitions with quantum numbers up to K a ¼ 21 and J ¼ 32. A second fit is presented considering the Coriolis interactions with two dark state combination bands perturbing the rotational structure of the fundamental, fitting a total of 1118 lines and with quantum numbers up to K a ¼ 21 and J ¼ 42.