Determination of the Line-Shift and Line-Broadening Coefficients in the ν3 Band of NO2 Perturbed by O2, N2, H2, D2, and CO2

✍ Scribed by S. Bouazza; A. Kissel; B. Sumpf; H.-D. Kronfeldt

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 182 KB
• Volume: 198
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1999.7912

✦ Synopsis

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-m region corresponding to the 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 Յ NЉ Յ 38 and 1 Յ KЉ a Յ 5. This experimental study confirms general trends. The broadening coefficients decrease with an increase of the rotational quantum number NЉ whereas the absolute values of the line-shift coefficient increase with increasing NЉ. 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.