Knowledge Bank

Spectra of $H2O,H218O,D2O$ and HDO have been recorded in the region from about $15cm-1$ to $300cm-1$ using a Bomem interferometer at at apodized resolution of about $0.004cm-1$. The accuracy of measurement is, for the most part, better than $4\times 10-4cm-1$ and the frequencies should therefore be useful for the calibration of high resolution spectrometers until more accurate heterodyne measurements become available. Some of the data have been fitted, together with available microwave data, to Watson's A-reduced hamiltonian.