Effects of strong vibrational excitation in water vapor spectroscopy
A.D. Bykov, N.N. Lavrentieva, L.N. Sinitsa
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
Keywords: spectrometers, vibrational-rotational states, resonances, asymmetric top, potential surface, line broadening, line contour, intermolecular interactions
Subsection: TOPICAL ISSUE
Abstract
High-sensitive spectrometers, created at IAO SB RAS for studying highly excited states, are described. The spectrometers include a Fourier spectrometer with a multipath absorption cell and spectrometers that use modern methods of highly sensitive laser spectroscopy (intracavity laser spectrometers, spectrometers with a high quality external cavity). Designed spectrometers have a high spectral resolution (0.01…0.001 cm-1) and high sensitivity to absorption (10-7 - 3 × 10-9 cm-1), which makes them promising for the study of parameters of spectral lines arising from transitions to high-energy vibrational-rotational states. The effects of the vibrational-rotational dynamics related to the chaotic behavior under strong excitation are considered by analyzing spectra of water vapor. They are: an anomalous centrifugal distortion, HEL-resonances in H2O, the nν3 highly excited states of the HD16O, the vibrational dependence of the line contour parameters, and the effect of intramolecular resonances on interference lines.
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