Abstract
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 A3Σ--X3Σ-. Transitions 1-0+, 0+-1 have not been observed. Derived constants, in cm-1, for 128TeO are as follows:
| State | T00 | ωe | xeωe |
|---|---|---|---|
| A1 | 27641.83 +x | - | - |
| A0+ | 28036.48 | ΔG1/2 = 445.25 | |
| X1 | x | 798.70 | 4.00 |
| X0+ | 0 | 797.69 | 4.00 |
| x ≃ 2750 cm-1 | |||
| B | 103α | r (Å) | |
| 1+ | B0 = 0.2779±0.0002 | - | |
| A1- | B0 = 0.2775±0.0002 | - | r0 = 2.066 |
| A0+ | B0 = 0.2735±0.0001 | 5.50 ±0.03 | r0 = 2.082 |
| 1+ | Be = 0.3575±0.0003 | 2.379±0.003 | |
| X1- | Be = 0.3572±0.0003 | 2.368±0.003 | re = 1.821 |
| X0+ | Be = 0.3560±0.0002 | 2.375±0.004 | re = 1.825 |
The upper state is perturbed, and is also predissociated in A0+ at ν = 9. The dissociation energy D0" is estimated to be about 90 kcal mole-1.