Line frequency and line intensity analyses of water vapour

Abstract

Line position and line intensity analyses of new microwave and infrared data pertaining to water and involving the ground and (010) vibrational states are carried out using the same theoretical approach as in Coudert, L. H., 1997, J. molec. Spectrosc., 181, 246. The line position analysis involves the high J and Ka lines measured by Polyansky, O. L., Zobov, N. F., Viti, S., Tennyson, J., Bernath, P. F. and Wallace, L., 1997, J. molec. Spectrosc., 186, 422 and the ν2 band transitions published by Toth, R. A., 1998, J. molec. Spectrosc., 190, 379. In contrast to the previous investigation, the maximum Ka value in the data set is 24 for the ground vibrational state and 21 for the (010) state. The data set considered in the line intensity analysis includes mainly the line intensities reported by Toth and is much more complete than that fitted in the present author's previous investigation as it contains many lines within the ground and (010) vibrational states. The theoretical approach accounts correctly for the observed data for both analyses. However, in the line position analysis, a few transitions had to be excluded from the fitting because they involved high lying perturbed rotational levels belonging to the (010) vibrational state.