LINE POSITIONS AND INTENSITIES OF THE NU-1-NU-2+NU-3 AND 2-NU-2+2-NU-3 BANDS OF O-16(3)(2)

A study of high-resolution (0.006 cm-1) Fourier transform absorption s pectra of O-16(3) around 3450 cm-1 has been performed, leading to the first analysis of the nu1 + 2nu2 + nu3 and 2nu2 + 2nu3 bands of this m olecule. To increase the absorption strength of these very weak bands a White cell with path lengths of up to 36 m and pressures from 40 to 55 Torr was used. The rotational energy levels of the (121) and (022) vibrational states deduced from observed spectra have been satisfactor ily reproduced using a Hamiltonian matrix which takes explicitly into account the Coriolis interaction between (121) <--> (022) and (121) <- -> (220) and Darling-Dennison interaction between (022) <--> (220). Fu rthermore about 60 and 20 line intensities, respectively, for the (121 ) and (022) bands were measured with an accuracy of about 6 and 12%, l eading to the determination of the nu1 + 2nu2 + nu3 and 2nu2 + 2nu3 vi brational transition moments. Finally, a complete list of line positio ns, intensities, and lower state energies for both bands has been gene rated. (C) 1994 Academic Press, Inc.