双原子氢化物阳离子II：OH $^+$和SH $^+$的电子碰撞激发
Electron-impact excitation of diatomic hydride cations II: OH$^+$ and SH$^+$
摘要：
R-矩阵计算结合绝热核旋转和库仑玻恩近似被用来计算两个开壳层的天体物理学感兴趣的双原子阳离子的电子碰撞旋转速率系数：羟基和硫酰基离子，OH $^+$和SH $^+$。利用无限阶突跃近似推导了超精细分辨速率系数。观察到的倾向规则$ΔF=Δj=ΔN=\pm 1$，如预期的阳离子与一个大的偶极矩。本文提出一个猎户座棒光子支配区（PDR）的OH $^+$激发模型，它很好地再现了Herschel对电子分数$x_e=10^{-4}$和OH $^+$柱密度为$3\times 10^{13}$ ~cm $^{-2}$的观测。电子碰撞电子激发截面和速率系数的离子。
英文摘要：
R-matrix calculations combined with the adiabatic-nuclei-rotation and Coulomb-Born approximations are used to compute electron-impact rotational rate coefficients for two open-shell diatomic cations of astrophysical interest: the hydoxyl and sulphanyl ions, OH$^+$ and SH$^+$. Hyperfine resolved rate coefficients are deduced using the infinite-order-sudden approximation. The propensity rule $ΔF=Δj=ΔN=\pm 1$ is observed, as is expected for cations with a large dipole moment. A model for OH$^+$ excitation in the Orion Bar photon-dominated region (PDR) is presented which nicely reproduces Herschel observations for an electron fraction $x_e=10^{-4}$ and an OH$^+$ column density of $3\times 10^{13}$~cm$^{-2}$. Electron impact electronic excitation cross sections and rate coefficients for the ions are also presented.
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