B. Sumpf et al., Quantum number dependence of lineshift coefficients induced by collisions with noble gas perturbers in the nu(3) band of NO2, J MOL SPECT, 199(2), 2000, pp. 217-224
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.