HIGH RESOLUTION INFRARED SPECTRA OF $C_{2}D_{2}$

This research was supported, in part, by the U. S. Atomic Energy Commission (COO-882-15), and the National Science Foundation, through contracts with The Ohio State University Research Foundation. $^{1}$ S. Ghersctti and K. Narahari Rao, J. Mol. Spectry (in press).Author Institution: Laboratory of Molecular Spectroscopy and Infrared Studies, Department of PhysicsSeveral bands of $C_{2}D_{2}$ in the PbS and Ge:Hg resions have been measured using a high resolution vacuum infrared spectrograph, and rotational analyses of these have been performed. The results obtained combined with those previously $reported^{1}$ permit a highly accurate determination of the rotational constants for the ground state as well as for other vibrational states of this molecule. A set of constants which fits about thirty experimentally determined vibrational levels will also be discussed