Knowledge Bank

High resolution spectra ($0.01cm-1$) of HDO have been obtained in the 2400 to $3200cm-1$ using a Fourier Transform Spectrometer located at the Kitt Peak National Observatory. Values of the ground state levels were determined from the data and fitted to Watson-type Hamiltonian from which 17 rotational constants were obtained. A comparison was made between the ground state levels obtained in this study and those calculated from the constants given by DeLucia et $al.1$ Measurements of line strengths of over 500 lines in the two bands were made using the equivalent width method. The line strengths were fitted by the method of least-squares taking into consideration interactions.