THE 2-NU(2) BAND OF WATER - ANALYSIS OF NEW FTS MEASUREMENTS AND HIGH-K-A TRANSITIONS AND ENERGY-LEVELS

The spectrum of water has been recorded at high resolution in the rang e 2500-4560 cm(-1). The spectrum was recorded at room temperature with a Fourier transform spectrometer using fully evacuated transfer optic s and a White-type multi-reflection cell which made large pressure X p athlength products possible. Among 3385 lines assigned to transitions to the first tried of interacting stales of (H2O)-O-16 (bands 2 nu(2), nu(1) and nu(3)), 940 vibration-rotation transitions have been assign ed to the 2 nu(2) band, approximately 300 of them for the first time. According to our assignments some of these transitions, especially hig h-K-a transitions, show significant deviations from data available in various compilations and in previously published reports, Improved val ues of vibration-rotation energies of the (020) state up to J = 17 and K-a = 11 were determined. The anomalously strong centrifugal distorti on of the (020) rotational levels and their resonance interactions wit h the (100) and (001) levels have been accounted for using the generat ing function model (1992, VI. G. Tyuterev, J. Mol. Spectrosc. 151, 97- 130; 1995, VI, G, Tyuterev, V.I. Starikov, S. A. Tashkun, and S. N. Mi khailenko, J. Mol. Spectrosc. 170, 38-58), which allows a good agreeme nt with observed data. The RMS standard deviation of the least-squares fit of vibration-rotational levels of the (020) slate was 2.2 x 10(-3 ) cm(-1). (C) 1997 Academic Press.