| Autor: |
Taher, F., Bernard, A., Effantin, C., d'Incan, J., Shenyavskaya, E.A., Vergès, J. |
| Zdroj: |
Journal of Molecular Spectroscopy; October 1996, Vol. 179 Issue: 2 p229-236, 8p |
| Abstrakt: |
An extensive study of theB(1)1Π →X1Σ+system of45Sc35Cl and45Sc37Cl observed in high resolution spectra of the molecular thermal emission is presented. The rotational analysis reveals the presence of localized perturbations in almost all branches of bands withv′ ≤ 5, associated with hyperfine broadening of the perturbedQlines. These effects are interpreted as consequences of the avoided crossing betweenB(1)1Π(v) and (1)3Σ+(v+ 2) levels due to spin–orbit interaction. It appears possible to enter the interacting levels for both isotopomers in the same matrix representation, the energy term elements only involving equilibrium parameters of the states (isotopically scaled to45Sc35Cl). A semideperturbed model of the interacting states, taking account of the (v∼v+ 2) perturbations only, is first envisaged. The simultaneous fit of some 6600 line wavenumbers in 17 bands for45Sc35Cl and 7 bands for45Sc37Cl with a total standard deviation of 0.005 cm−1makes it possible to characterize the (1)3Σ+state and precisely describeB(1)1Π fromv= 0 tov= 5. Spin–orbit interaction parameters ξv,v+2are determined. A full deperturbation is then carried out using a model describing the levelsv= 0 tov= 7 of45Sc35Cl andv= 0 tov= 4 of45Sc37Cl for the two states, and taking account of all significant interactions. The following principal equilibrium molecular constants (in cm−1) are obtained: —for (1)3Σ+,[formula]The vibration-independent spin–orbit interaction parameter is directly determined, ξel= 53.02 cm−1. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
Full Text from ScienceDirect