The vibration-rotation emission spectra of gaseous CdH2 and CdD2.

The vibration-rotation emission spectra of CdH₂ and CdD₂ molecules have been recorded at high resolution using a Fourier-transform spectrometer. The molecules were generated in a furnace-discharge emission source by reaction of cadmium vapor with molecular hydrogen or deuterium. The fundamental bands for the antisymmetric stretching mode (υ₃) of CdH₂ and CdD₂ were detected at about 1771.5 and 1278.3 cm^-1, respectively. In addition, the 002(Σ_g⁺)–001(Σ_u⁺) and 011(Π_g)–010(Π_u) hot bands were observed for CdH₂. Spectroscopic constants were determined for each of the 12 observed isotopologs: ¹¹⁰CdH₂, ¹¹¹CdH₂, ¹¹²CdH₂, ¹¹³CdH₂, ¹¹⁴CdH₂, ¹¹⁶CdH₂, ¹¹⁰CdD₂, ¹¹¹CdD₂, ¹¹²CdD₂, ¹¹³CdD₂, ¹¹⁴CdD₂, and ¹¹⁶CdD₂. The average Cd-H and Cd-D bond distances (r₀) were determined to be 1.683028(10) and 1.679161(16) Å, respectively. [ABSTRACT FROM AUTHOR]