Update of the AFGL atmospheric absorption line parameters compilation.

Table I. Visible Bands of H2O on Compilation (4V,4V + δ,5v) dioxide; ozone; nitrous oxide; carbon monoxide; and oxygen. This new version supersedes the last revision of September 1976. The major modifications are to water vapor, carbon dioxide, methane, and oxygen (identified as molecules 1, 2, 6, and 7 on the compilation). All halfwidths of water for transitions up to 13,000 cm have been replaced with values obtained from theoretical calculations based on Ref. 3. The new linewidths differ substantially from the older values for high-J transitions. The calculations were also carried out separately for the four iso­ topes, although no vibrational dependence of width has been included. Previously the widths of the isotopic lines of H2O and H2O were to have been assumed equal to those of the equivalent transitions of H2O. Nevertheless, many of the widths of the two less abundant isotopes were in error on earlier versions of the compilation apparently due to a pro­ gram error; this situation is now rectified as well by the sep­ arate calculations. The lower state energies of all the symmetric isotopes of water have been updated to be consistent with the recent work of Flaud et al. Work is still in progress with the purpose of improving the transition frequencies and strengths of most of the water bands—thus it will be found that the present line positions do not in general form a self-consistent set with the latest energy levels. Originally, the compilation was not expected to cover wavelengths shorter than 1 μm. However, first with the ad­ dition of the atmospheric oxygen bands, and now with the inclusion of high vibrational water transitions described below, the compilation extends to about 18,000 cm. This has ne­ cessitated the continuation of the 3v + δ region of water (0.8 μm) that was abruptly terminated in the early versions. The data have been resumed at 12,075 cm and extend to 12,938 cm. Some 2933 lines in the visible region (4v,4v + Δ,5V) from 13,274 cm to 17880 cm have been incorporated into the