NOBLE-GAS INDUCED PRESSURE BROADENING IN THE NU(3),NU(2)-NU(2), AND 2-NU(2) BANDS OF NO2(NU(3))

Experimental results on the pressure broadening of NO2 for collisions with the noble gases He, Ne, Ar, Kr, and Xe are presented. The broaden ing coefficients of six lines in the nu(3) band near 1616.85 cm(-1) wi th quantum numbers 2 less than or equal to N '' less than or equal to 44, 1 less than or equal to K-a '' less than or equal to 5, and of sev en lines in the nu(2) + nu(3) - nu(2) band with 29 less than or equal to N '' less than or equal to 36, 0 less than or equal to K-a '' less than or equal to 5, and of one line from the 2 nu(2) band with N '' = 38, K-a '' = 5 are measured using a tunable diode laser spectrometer. The experimental values for lines with smaller N '' for the nu(3) band extend previous experimental data to analyze the dependence of the br oadening coefficients on the quantum numbers N '' and K-a ''. Summariz ing the available experimental data one can state that for collisions with helium, neon, and argon neither a clear N '' nor a K-a '' depende nce is observable. For the krypton and xenon broadening coefficient a weak decrease with increasing N '' was found. Due to the restricted qu antum number range of lines in the hot band and the overtone band the quantum number dependence could not be discussed. The range of values for the present measurements is consistent with previous measurements on the nu(3) fundamental band. (C) 1996 Academic Press, Inc.