论文标题
h $ _2 $ fiak y equalton Impact的同位素和振动水平的依赖性
Isotopic and vibrational-level dependence of H$_2$ dissociation by electron impact
论文作者
论文摘要
数十年来，分子氢的低能电子影响解离一直是各种计算和测量之间的分歧的根源。现在对离解$ b ^3σ_U ^+$状态激发了H $ _2 $的基础状态现在已经充分了解，最近的测量值与分子收敛关闭偶联（MCCC）的积分和差异横截面的计算非常吻合（2018年Rev. A 98 062704）。但是，在没有针对振动兴奋的或同位素固定的h $ _2 $的相似测量的情况下，必须单独通过理论来确定这些物种解离的横截面。我们已经确定了MCCC计算与推荐的$ r $ -Matrix横截面之间的巨大差异并依赖初始振动水平。在这里，我们研究了差异的来源，并讨论了已包含先前推荐数据的等离子体模型的后果。
The low-energy electron-impact dissociation of molecular hydrogen has been a source of disagreement between various calculations and measurements for decades. Excitation of the ground state of H$_2$ into the dissociative $b ^3Σ_u^+$ state is now well understood, with the most recent measurements being in excellent agreement with the molecular convergent close-coupling (MCCC) calculations of both integral and differential cross sections (2018 Phys. Rev. A 98 062704). However, in the absence of similar measurements for vibrationally-excited or isotopically-substituted H$_2$, cross sections for dissociation of these species must be determined by theory alone. We have identified large discrepancies between MCCC calculations and the recommended $R$-matrix cross sections for dissociation of vibrationally-excited H$_2$, D$_2$, T$_2$, HD, HT, and DT (2002 Plasma Phys. Contr. F. 44 1263-1276,2217-2230), with disagreement in both the isotope effect and dependence on initial vibrational level. Here we investigate the source of the discrepancies, and discuss the consequences for plasma models which have incorporated the previously recommended data.
