US EPA

6588167 

Journal Article 

High resolution FTIR spectroscopy of 1,1,1,2-tetrafluoroethane: nu(6) 

Thompson, CD; Robertson, EG; Evans, CJ; Mcnaughton, D; , 

2003 

Yes 

Journal of Molecular Spectroscopy
ISSN: 0022-2852
EISSN: 1096-083X 

ACADEMIC PRESS INC ELSEVIER SCIENCE 

SAN DIEGO 

218 

1 

48-52 

10.1016/S0022-2852(02)00079-6 

WOS:000182492200006 

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 v(6), an a/b hybrid band at 1104.5 cm(-1). Least squares fits were used to derive effective rotational and centrifugal distortion constants for v(6) using a total of 799 assigned transitions with quantum numbers up to K-a = 21 and J = 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 = 21 and J = 42. (C) 2003 Elsevier Science (USA). All rights reserved. 

IR spectroscopy; 1,1,1,2-tetrafluoromethane; hydrofluorocarbon; rovibrational analysis; enclosive flow cooling; supersonic jet expansion