INFRARED DIODE LASER SPECTROSCOPY OF THE $\nu_{2}$ FUNDAMENTAL AND $\nu_{2}+\nu_{3}\leftarrow \nu_{2}$ BANDS OF THE $CD_{3}$ RADICAL.

$^{1}$ W. M. Fawzy and T.J. Sears, Forty-Fourth Symposium on Molecular Spectroscopy at Ohio State. Columbus, paper MF9. $^{2}$ T. Amano, P. Bernath. C. Yamada. Y. Endo, and E. Hirota, J. Chem. Phys. 77, 5284(1982). Work at Brookhaven National Laboratory was carried out under contract DE-AC02-76CH00016 with the U.S. Department of Energy and supported by its Division of Chemical Sciences, Office of Basic Energy Sciences.Author Institution: Department of Chemistry, University of Cambridge; Departemt of Chemistry, Brookhaven National LaboratoryThe observation and a preliminary analysis of about twenty ro-vibrational transitions of the $\nu_{3}$ fundamental of the $CD_{3}$ radical was reported at this meeting last $year^{1}$. We present here analysis of sixty two infrared absorption lines in the $\nu_{3}$ fundamental band. The main molecular parameters determined in the present work are the band origin $\nu_{0}= 2381.0886(40). B^{\prime}=4.758737(40), C^{\prime}= 2.373297(34),(\zeta C),= 0.476278(72), q, = 0.00376(59)$, all in $cm^{1}$ with one standard deviation in parenthesis. The derived molecular parameters were compared with those for the $CH_{3}$ radical $\nu_{3} = I$ level determined $previously^{2}$. A relatively weak set of transitions were also observed in the vicinity of the $\nu_{3}$ fundamental. These transitions were tentatively assigned to the $\nu_{2} +\nu_{3} \leftarrow \nu_{2}$ infrared transition. Results for both the $\nu_{3}$ and $\nu_{2}+\nu_{3}\leftarrow \nu_{2}$ bands will be discussed