The infrared spectrum of selenoketene

Mid-infrared FTIR spectra of argon matrix isolated selenoketene-d0 and selenoketene-d1 have been recorded. These transient species were prepared by flow thermolysis of the corresponding 1,2,3-thiadiazoles. With the aid of ab initio predictions of the vibrational frequencies and intensities, six of the nine fundamentals have been identified for each isotopomer. The spectra are dominated by a very intense C-C stretching band; the other fundamentals are significantly weaker and more difficult to assign.