TUNABLE DIODE LASER MEASUREMENTS OF ABSOLUTE INTENSITIES AND LINEWIDTHS IN THE $\nu_{6}$ BAND OF $^{12}CH_{3}D$ NEAR $8.6 \mu m$

Address of Thakur: Physics Department, The Ohio State University, 174 West 18th Avenue, Columbus, Ohio, 43210. Address of Malathy Devi: Physics Department, College of William and Mary, Williamsburg, Virginia, 23185. Address of Rinsland and Smith: Atmospheric Sciences Division, Mail Stop 401A, NASA Langley Research Center, Hampton, Virginia, 23665-5225.Author Institution:Absolute line intensities were measured at room temperature for 21 transitions in the $\nu_{6}$ (E) perpendicular band of $^{12}CH_{3}D$ in the $1090-1140 cm^{-1}$ region using a tunable diode laser spectrometer. Although the line intensities were determined with high precision (= 3\%), the square of the vibrational transition dipole moment matrix element derived from each line intensity varied by several percent (= 20\%) indicating intensity perturbations, possibly caused by Coriolis interactions with the nearby $\nu_{3}$ parallel-type fundamental. Room temperature air-and nitrogen-broadened halfwidths have also been determined for these lines. The average of the ratios of nitrogen- to air-broadened halfwidths was 1.01 with a standard deviation of 0.01, indicating almost equal broadening efficiencies for nitrogen and air. Room temperature self-broadened halfwidths were determined for two transitions with a mean value of $0.081 \pm 0.010 cm^{-1} atm^{-1}$