Near-infrared electronic spectra of BiSe

NIR/VIS emission spectra of BiSe were measured in the 5800-20,000 cm−1 region with a Fourier-transform spectrometer. BiSe was produced by reaction of bismuth and selenium vapors and excited by energy transfer from metastable oxygen O2(a1Δg) in a fast-flow system. The spectrum of BiSe was found to be closely related to those of the previously studied BiO and BiS radicals. Four band systems were unambiguously assigned to the transitions X22Π3/2 → X12Π1/2, A24Π1/2 → X12Π1/2, C14Σ−1/2 → X12Π1/2 and C14Σ−1/2 → A24Π1/2 and the electronic energies and vibrational constants of the states X12Π1/2, X22Π3/2, A24Π1/2 and C14Σ−1/2 were derived.