Rotational analysis of the A - X system of tellurium monoxide

A fairly complete rotational analysis has been made of a number of bands of the main system A-X of TeO using two separated tellurium isotopes. A new vibrational analysis is proposed and is confirmed by the isotope effect. The structure of the bands indicates that Hund's case c applies to both states, so that the transition is better described as A0 + -X0 + , A1-X1, rather than A 3 Σ - -X 3 Σ - . Transitions 1-0 + , 0 + -1 have not been observed. Derived constants, in cm -1 , for 128 TeO are as follows: The upper state is perturbed, and is also predissociated in A0 + at ν = 9. The dissociation energy D 0 " is estimated to be about 90 kcal mole -1 .