Infrared and near infrared emission spectra of TeH and TeD

The vibration-rotation emission spectra for the X2Π ground state and the near infrared emission spectra of the X2Π1/2-X2Π3/2 system of the TeH and TeD free radicals have been measured at high resolution using a Fourier transform spectrometer. TeH and TeD were generated in a tube furnace with a DC discharge of a flowing mixture of argon, hydrogen (or deuterium), and tellurium vapor. In the infrared region, for the X2Π3/2 spin component we observed the 1-0, 2-1, and 3-2 vibrational bands for most of the eight isotopologues of TeH and the 1-0 and 2-1 bands for three isotopologues of TeD. For the X2Π1/2-X2Π3/2 transition, we observed the 0-0 and 1-1 bands for TeH and the 0-0, 1-1, and 2-2 bands for TeD. Except for a few lines, the tellurium isotopic shift was not resolved for the X2Π1/2-X2Π3/2 transitions of TeH and TeD. Local perturbations with Δv = 2 between the two spin components of the X2Π state of TeH were found: X2Π1/2, v = 0 with X2Π3/2, v = 2; X2Π1/2, v = 1 with X2Π3/2, v = 3. The new data were combined with the previous data from the literature and two kinds of fits (Hund's case (a) and Hund's case (c)) were carried out for each of the 10 observed isotopologues: 130TeD, 128TeD, 126TeD, 130TeH, 128TeH, 126TeH, 125TeH, 124TeH, 123TeH, and 122TeH.