Radiative quenching of He(2 1S) induced by collisions with ground-state helium atoms.
Radiative quenching of He(2 1S) induced by collisions with ground-state helium atoms.
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DOI：
10.1103/physreva.38.1877
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发表时间：
1988-08
期刊：
影响因子：
--
通讯作者：
Zygelman;Dalgarno
中科院分区：
文献类型：
--
作者：
Zygelman;Dalgarno
讨论了碰撞诱发辐射猝灭的半经典理论、光势理论和量子畸变波理论，并给出了它们之间的关系。应用这三种方法计算了He(2 $^{1}\mathit{S}$)+He(1 $^{1}$ S) \ensuremath{\rightarrow} He(1 $^{1}$ S)+He(1 $^{1}$ S)+h \ensuremath{\nu}过程的热碰撞能截面。对$^{4}$${\mathrm{He}}_{2}$分子的激发态A $^{1}\ensuremath{\Sigma}_{u}^{+}$的势能曲线进行了几种选择。通过与量子力学理论的比较，评价了半经典和光势方法的精度。结果表明，截面对A $^{1}\mathrm{\ensuremath{\Sigma}}_{\mathit{u}}^{+}$势垒敏感，但预测截面的主要不确定性在于所采用的跃迁偶极矩。
The semiclassical, optical potential, and quantal distorted wave theories of collision-induced radiative quenching are discussed and the relationships between them are presented. The three procedures are applied to the calculation of the cross sections at thermal collision energies of the process He(2 $^{1}\mathit{S}$)+He(1 $^{1}$S)\ensuremath{\rightarrow}He(1 $^{1}$S)+He(1 $^{1}$S)+h\ensuremath{\nu}. Several choices of the potential energy curves of the excited A $^{1}\ensuremath{\Sigma}_{u}^{+}$ state of the $^{4}$${\mathrm{He}}_{2}$ molecule are employed. The accuracy of the semiclassical and optical potential methods is assessed by comparison with the quantum-mechanical theory. It is shown that the cross sections are sensitive to the barrier in the A $^{1}\mathrm{\ensuremath{\Sigma}}_{\mathit{u}}^{+}$ potential but the major uncertainty in the predicted cross sections lies in the adopted transition dipole moment.