A spectrum of the hot water molecule has been recorded in emission at a temperature of 1000 degrees C in the region 900 cm(-1) to 2000 cm(-1). A total of 4381 lines were observed; 1750 are assigned, mostly to the nu(2), 2 nu(2) - nu(2), 3 nu(2) - 2 nu(2), 4 nu(2) - 3 nu(2), and 5 nu(2) - 4 nu(2) bands. The 5 nu(2) - 4 nu(2) band has been seen for the first time and the rotational analysis of the other hot bands has been extended to high J and K-a values. The assignment of transitions involving previously unobserved levels was achieved using high accuracy ab initio electronic structure calculations, an ab initio adiabatic correction to this potential, and variational nuclear motion calculations of the spectra. The band origin of 5 nu(2) is determined to be 7542.39 cm(-1) +/- 0.05 cm(-1), significantly different from the value obtained from the ''dark state'' perturbative treatment. (C) 1997 Academic Press.
|Number of pages||16|
|Journal||JOURNAL OF MOLECULAR SPECTROSCOPY|
|Publication status||Published - Jul 1997|
- HYDROGEN FLAME SPECTRA
- RO-VIBRATIONAL LEVELS
- COLLISIONAL LINEWIDTHS