
Elastic collisions of sulfur and hydrogen in their ground states at low temperatures and spectroscopic parameters of SH(X^{2}$\varPi$^{}) radical
Shi DeHeng(施德恒), Zhang JinPing(张金平), Sun JinFeng(孙金锋), Liu YuFang(刘玉芳), Zhu ZunLüe(朱遵略), Ma Heng(马恒), and Yang XiangDong(杨向东)
Chin. Phys. B, 2008, 17 (10):
36783686.
DOI: 10.1088/16741056/17/10/025
This paper constructs the interaction potential of the SH($X^{2}\varPi)$ radical by using the coupledcluster singlesdoublesapproximatetriples theory combining the correlationconsistent quintuple basis set augmented with the diffuse functions, augccpV5Z, in the valence range. Employing the potential, it accurately determines the spectroscopic parameters. The present $D_{\rm e}$, $R_{\rm e}$, $\omega_{\rm e}$, $\omega_{\rm e}\chi_{\rm e}$, $\alpha _{\rm e}$ and $B_{\rm e}$ values are of 3.7767 eV, 0.13424 nm, 2699.846 cm$^{  1}$, 47.7055 cm$^{  1}$, 0.2639 cm$^{  1}$ and 9.4414 cm$^{  1}$, respectively, which are in excellent agreement with those obtained from the measurements. A total of 19 vibrational states has been found when $J$ = 0 by solving the radial Schrödinger equation of nuclear motion. The complete vibrational levels, classical turning points, initial rotation and centrifugal distortion constants when $J$ = 0 are reported for the first time, which are in good accord with the experimental results. The total and various partialwave cross sections are computed for the elastic collisions of sulfur and hydrogen in their ground states at low temperatures when two atoms approach each other along the SH($X^{2}\varPi)$ potential energy curve. Over the impact energy range from 1.0$\times $10$^{  11}$ to 1.0$\times $10$^{  4}$ a.u., eight shape resonances have been found in the total elastic cross sections. For each shape resonance, the resonant energy is accurately calculated. Careful investigations have pointed out that these resonances result from the $l$ = 0, 1, 2, 3, 4, 6, 7, 8 partialwave contributions.
