Abstract
Emission spectra of the radicals TeS, TeSe and Te2 in the near-infrared spectral region have been measured with a high-resolution Fourier-transform spectrometer. The molecules were generated in a fast-flow system by reacting microwave-discharged mixtures of Tex, Sx, and/or Sex vapour and Ar carrier gas and excited by energy transfer and energy pooling processes in collisions with metastable oxygen O2(a1Δg). The b1Σ+(b0+)→X3Σ−(X10+,X21) electric dipole transitions of TeS and TeSe and the b1Σ+g(b0+g)→X3Σ−g(X21g) magnetic dipole transition of Te2 were measured at medium and high spectral resolution. A very weak emission at 3356cm−1 observed in the spectrum of TeSe was identified to be the 0–0 band of the hitherto unknown a1Δ(a2)→X3Σ−(X21) transition of the molecule. Analyses of the spectra have yielded a number of new or improved spectroscopic parameters of the molecules.
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