Quantum number dependence of lineshift coefficients induced by collisions with noble gas perturbers in the nu(3) band of NO2

To complete our study concerning lineshift in the rovibrational spectrum of (NO2)-N-14-O-16, a pulse-driven three-channel lead salt diode laser spectr ometer was applied to record high-resolution spectra at room temperature in the 6.2-mu m region corresponding to the v(3) band at low NO2 concentratio ns. The shift was studied for collisions with the noble gases He, Ne, Ar, K r, and Xe. This paper extends our recently published data in order to analy ze the quantum number dependence of the shift effect more precisely. Theref ore, in this paper, additionally eight unresolved NO2 doublets covering an enlarged quantum number range (10 less than or equal to N " less than or eq ual to 34, 2 less than or equal to K-a" less than or equal to 6) were studi ed. For all doublers, shift coefficients delta(NO2-noble) (gas) and additio nally broadening coefficients gamma(NO2-noble gas) were determined. Hereby, the experimental data confirm general trends published recently. In this s tudy, in the case of broadening for the lighter rare gases helium, neon, an d argon, only a slight decrease of gamma(NO2-noble gas) was observed, where as for the rare gases with a higher atomic weight, i.e., krypton and xenon, a pronounced decrease of gamma(NO2-noble gas) with increasing rotational q uantum number N " occurred. All measured lineshift coefficients were negati ve. The absolute value of the determined lineshift coefficient \delta(NO2-n oble gas)\ increases with the mass of the noble gas perturber, i.e., \delta (NO2-HE)\ < \delta(NO2-Ne)\ < \delta(NO2-Ar)\ < \delta(NO2-Kr)\ < \delta(NO 2-Xe)\. Within the studied quantum number range, an increase \delta(NO2-nob le gas)\ with increase of N " was observed. A typical trend of the shift an d broadening data on the quantum number K-a" was not observed. (C) 2000 Aca demic Press.