High-Temperature Rotational Transitions of Water in Sunspot and Laboratory Spectra

Details High-Temperature Rotational Transitions of Water in Sunspot and Laboratory Spectra High-Temperature Rotational Transitions of Water in Sunspot and Laboratory Spectra

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jmosp.186..422p&link_type=abstract

Journal of Molecular Spectroscopy, Volume 186, Issue 2, p. 422-447.

Physics

32

Scientific paper

Assignments are presented for spectra of hot water obtained in absorption in sunspots (T~ 3000°C and 750 <=/ν~<= 1010 cm-1) and in emission in the laboratory (T~ 1550°C and 370 <=/ν~<= 930 cm-1). These assignments are made using variational nuclear motion calculations based on a high-levelab initioelectronic surface, with allowance for both adiabatic and nonadiabatic corrections to the Born-Oppenheimer approximation. Some 3000 of the 4700 transitions observed in the laboratory spectrum are assigned as well as 1687 transitions observed in the sunspot spectrum. All strong lines are now assigned in the sunspot measurements. These transitions involve mostly high-lying rotational levels within the (0,0,0), (0,1,0), (0,2,0), (1,0,0), and (0,0,1) vibrational states. Transitions within the (0,3,0), (0,4,0), (1,1,0), (0,1,1), (0,2,1), (1,1,1), (1,2,0), and (1,0,1) states are also assigned. For most bands the range ofKavalues observed is significantly extended, usually doubled. New features observed include numerous cases where the closely degenerate levelsJKaKcandJKaKc+1with highKaare split by Coriolis interactions. Comparisons are made with the recent line list of Partridge and Schwenke (1997,J. Chem. Phys.106,4618).

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