Precision Measurements of Millimeter and Submillimeter Wave Spectra: DCl, DBr, and DI

Precision frequency measurements have been made on the $J=0\mathrm{}\to 1$ transitions of the deuterium halides DCl, DBr, and DI. The molecular constants derived from these measurements are The constants $D_0$ and $\alpha$ from infrared data were employed in the calculation of the $B$ and $r$ values.