Knowledge Bank

The high resolution rotation-vibration spectrum of $D2O$ has been obtained in the region 2600 to $3000cm-1$. The one meter Fourier transform spectrometer of the solar telescope at the Kitt Peak National Observatory in Tucson was used with a 25 cm cell at 3 Torr pressure and at room temperature. The spectral resolution is $0.01cm-1$. Allowed and forbidden transitions have been assigned to the $\nu 3$ fundamental band for $J\le 12$ and $K\le 5$. The ground state energies of Steenbeckeliers and J. $Bellet1$ are in general agreement with the observed combination differences formed from the assigned transitions. Upper state constants of the Watson Hamiltonian for the $\nu 3$ band have been determined from a nonlinear Least squares fit using the ground state constants.