Knowledge Bank

The spectrum of water has been recorded between 9500 and $11500cm-1$ with the Fourier transform interferometer built by J.W. Brault, at NSO (Kitt Peak, AZ). The resolution is $0.015cm-1$. More than 530 accurate rotational energy levels have been determined for the following vibrational states : (041), (220), (121), (022), (300), (201), (102), and (003), belonging to the first decad of interacting states. About 750 intensities of well isolated lines have been accurately measured (typical uncertainty 7%) using the curve of growth method. The intensities of the remaining lines have also been obtained using the line depths measured from the spectra. The uncertainty in the intensities obtained by this faster method is on the average 15%. Finally, a complete set of 2400 line positions and intensities is available between 9500 and $11500cm-1$.