THE NITRIC-OXIDE FUNDAMENTAL-BAND - FREQUENCY AND SHAPE-PARAMETERS FOR ROVIBRATIONAL LINES

Solar McMath FTS spectra, recorded with a full instrumental width of about 0.0064 cm-1, were obtained of the fundamental vibration-rotation band (v = 1 <-- 0) of (NO)-N-14-O-16. These spectra have been used to determine N2-induced-broadening and N2-induced-shift coefficients as well as line intensities and positions. Measurements were made from 1780 to 1952 cm-1, up to Absolute value of m almost-equal-to 22.5, for the P and R branches of the 2PI1/2 and 2PI3/2 subbands and a few transitions of the Q branch. The rotationless transition moments of the two sub-bands were found to be within 1/2% of each other. The first-order Herman-Wallis intensity factor, C, measured for the first time, is in excellent agreement with theoretical predictions. The band intensity is 114.9 +/- 3.4 cm-2 atm-1 at 296 K. The v = 1 <-- 0 N2-broadened widths and N2-induced pressure shifts are, respectively, 3% different and a factor of 2 smaller than those measured by Pine et al. [J. Mol. Spectrosc. 114, 132-147 ( 1985 ) ] for the v = 2 <-- 0 band. The broadening coefficients are, where comparisons can be made, a few to about twenty percent smaller and the intensities about four percent larger than results reported by Ballard et al. [J. Mol. Spectrosc. 127, 70-82 (1988)]. Line positions are retrieved and calibrated to an accuracy of +/-5 X 10(-5) cm-1 using the 1-0 band of CO. Comparisons of calculated positions based on the constants of Hinz et al. [J. Mol. Spectrosc. 119, 120-125 ( 1986)] reveal very good agreement for the 2PI3/2 subband and a systematic divergence for the 2PI/2 positions. The effects of hyperfine splittings are also detected for low m transitions. (C) 1994 Academic Press, Inc.