The ν2 + ν3 and ν2 + ν3 − ν2 Bands of 14N16O2: Line Positions and Intensities

✍ Scribed by A. Perrin; J.M. Flaud; C. Camypeyret; D. Hurtmans; M. Herman; G. Guelachvili

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 583 KB
• Volume: 168
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1994.1259

✦ Synopsis

High-resolution Fourier transform spectra recorded in the (2270-2400 \mathrm{~cm}^{-1}) and (1520-1600) (\mathrm{cm}^{-1}) spectral regions have been used to measure, up to very high (N) values, the positions of lines with (K_{a}=0-9) of the (\nu_{2}+v_{3}) and (\nu_{2}+\nu_{3}-\nu_{2}) bands of ({ }^{14} \mathrm{~N}^{16} \mathrm{O}{2}) as well as their absolute intensities and a self broadening coefficient (\gamma{0}=0.095 \pm 0.032 \mathrm{~cm}^{\prime} \mathrm{atm}^{-1}) (at (292 \mathrm{~K}) ). The spin-rotation energy levels were very satisfactorily reproduced using a theoretical model which explicitly takes into account both the Coriolis interaction between the spin-rotation levels of the (011) vibrational state and those of ((030)), and the spin-rotation resonances within (011) and (030). As a consequence, precise vibrational band centers and rotational, spin-rotation, and coupling constants were obtained for the diad (\left{(030),(011)\right.) of interacting states for ({ }^{14} \mathrm{~N}^{16} \mathrm{O}{2}). In addition, using a large set of individual (\nu{2}+\nu_{3}) line intensities, we have determined precisely the (\nu_{2}+\nu_{3}) transition moments of ({ }^{14} \mathrm{~N}^{16} \mathrm{O}{2}). On the other hand, the transition moments of the (\nu{2}+v_{3}-\nu_{2}) and (3 v_{2}) (\nu_{2}) bands were derived from those of the corresponding (\nu_{3}) and (2 \nu_{2}) cold bands. Finally, a comprehensive list of line positions and intensities of the interacting (\left{\nu_{2}+\nu_{3}, 3 \nu_{2}\right}) and (\left{\nu_{2}+\nu_{3}-\nu_{2}\right.), (\left.3 v_{2}-v_{2}\right}) bands of ({ }^{14} \mathrm{~N}^{16} \mathrm{O}_{2}) has been generated at 4.2 and (6.2 \mu \mathrm{m}), respectively. 1994 Academic Press, Inc.