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Journal of Russian Laser Research

, Volume 32, Issue 2, pp 99–105 | Cite as

Theoretical study of collision and collision-free radiative lifetimes of \( {{\text{S}}_2}\left( {{{\text{B}}^3}\Sigma_{\text{u}}^{-} \left( {{\upsilon^{\prime}} = 0 - 9} \right)} \right) \)

  • Zhiqiang Gai
  • Bing Yan
  • Xin Yu
  • Rui Li
  • Junhua Yu
  • Shoufu Pan
  • Deying Chen
Article

Abstract

We calculate multireference configuration-interaction wavefunctions and the potential-energy curves for the \( {B^3}\Sigma_u^{-} \) and \( {X^3}\Sigma_g^{-} \) states of the collision-free S2 molecule and the T-shape collision complex S2–He using cc-pVQZ basis sets. We obtain the transition dipole moments of the \( {{\text{S}}_2}\left( {{B^3}\Sigma_u^{-} \to {X^3}\Sigma_g^{-} } \right) \) and the Franck–Condon factors between the vibrational levels of this two states. We evaluate the radiative lifetimes of \( {{\text{S}}_2}\left( {{B^3}\Sigma_u^{-} \left( {{\upsilon^{\prime}} = 0 - 9} \right)} \right) \) levels of the collision complex and the collision-free molecule and compare them with the experiments. The collision provides little change in the radiative lifetimes of \( {{\text{S}}_2}\left( {{B^3}\Sigma_u^{-} \left( {{\upsilon^{\prime}} = 0 - 9} \right)} \right) \) according to the previous calculations. We obtain excellent agreement between the theoretical results and the experiments. The data calculated are very useful in the study of the microwave-driven high-pressure sulfur lamp and an S2 laser pumped by a transverse fast discharge.

Keywords

S2–He system transition dipole moment transition probabilities radiative lifetimes 

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Copyright information

© Springer Science+Business Media, Inc. 2011

Authors and Affiliations

  • Zhiqiang Gai
    • 1
  • Bing Yan
    • 2
  • Xin Yu
    • 1
  • Rui Li
    • 2
  • Junhua Yu
    • 1
  • Shoufu Pan
    • 2
  • Deying Chen
    • 1
  1. 1.National Key Laboratory of Science and Technology on Tunable LaserHarbin Institute of TechnologyHeilongjiangChina
  2. 2.Institute of Atomic and Molecule PhysicsJi Lin UniversityJilinChina

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