Determination of the Line-Shift and Line-Broadening Coefficients in the nu(3) Band of ()NO(2) Perturbed by ()O(2), N(2), H(2), D(2), and CO(2).

ABSTRACT

A high-resolution three-channel diode-laser spectrometer was used to record a large number of spectra with (14)N(16)O(2) and foreign gas pressures ranging from 0.1 to 0.4 and 20 to 150 Torr, respectively, at room temperature. The 6.2-µm region corresponding to the nu(3) band of NO(2) was analyzed and the broadening and shift coefficients were derived in the case of collisions between NO(2) and H(2), D(2), O(2), N(2), CO(2), and SO(2) for 13 lines with 18 experimental study confirms general trends. The broadening coefficients decrease with an increase of the rotational quantum number N" whereas the absolute values of the line-shift coefficient increase with increasing N". In the case of the studied diatomic perturbers the size of the broadening coefficients corresponds to the size of the quadrupole moments. The only collision partner with nonvanishing dipole moment, SO(2), shows the largest broadening effect as expected. All shift coefficients are negative for the lines under study. Copyright 1999 Academic Press.