THE VIBRATION-ROTATION EMISSION SPECTRA OF GASEOUS $Z_{n}H_{2}$ AND $Z_{n}D_{2}$

Author Institution: Department of Chemistry, University of Waterloo; Department of Physics, University of WaterlooHigh resolution infrared emission speetra of gaseous $ZnH_{2}$ and $ZnD_{2}$ have been recorded with a Fourier transform spectrometer. The molecules were generated in an emission source that combines an electrical discharge with a high temperature furnace. The vibration-rotation emission spectra of $ZnH_{2}$ and $ZnD_{2}$ were recorded in the $1200-2200 cm^{-1}$ region at an instrumental resolution of $0.01 cm^{-1}$. The antisymmetric stretching fundamental bands, $001-000$, of $^{64}ZnH_{2}$ and $^{64}ZnD_{2}$ were observed near $1889.4 cm^{-1}$ and $1371.6 cm^{-1}$, respectively, and for the minor isotopes of zinc, $^{66}$Zn and $^{68}$Zn, the band origins were shifted by approximately $1-2 cm^{-1}$. Preliminary analysis of the spectra resulted in $r_{0}$ values of $1.535271(1) \AA$ and $1.531833(9) \AA$ for $^{64}ZnH_{2}$ and $^{64}ZnD_{2}$, respectively. Several hot bands of $ZnH_{2}$ involving $\nu_{1}, \nu_{2}$ and $\nu_{3}$ have also been observed, and analysis of these bands will lead to an equilibrium structure $(r_{e})$ for $ZnH_{2}$. The results will be presented at the symposium