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arXiv 0810.3462physics.chem-phphysics.space-ph
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HeH + + e-直接和间接解离复合率的从头算框架变换计算

ab initio frame transformation calculations of direct and indirect dissociative recombination rates of HeH+ + e-

Daniel J. Haxton, Chris H. Greene

摘要:

HeH $^+$阳离子与自由电子发生解离复合,产生中性He和H片段。我们使用从头计算量子缺陷和Fano的振转框架转换技术,以及PRL 89,263003(2002)的方法,计算了低能(1-300 meV)和高能(约100 MeV)的复合率。0.6 Hartree)区域。我们获得了非常好的协议与实验结果,表明这种相对简单的方法是能够再现所观察到的速率为两个间接的解离重组,驱动的低能量区域中的旋转振动自电离态,和直接的解离重组,驱动的电子自电离里德堡态连接到较高能量的激发阳离子通道。

英文摘要:

The HeH$^+$ cation undergoes dissociative recombination with a free electron to produce neutral He and H fragments. We present calculations using ab initio quantum defects and Fano's rovibrational frame transformation technique, along with the methodology of PRL 89, 263003 (2002), to obtain the recombination rate both in the low-energy (1-300 meV) and high-energy (ca. 0.6 hartree) regions. We obtain very good agreement with experimental results, demonstrating that this relatively simple method is able to reproduce observed rates for both indirect dissociative recombination, driven by rovibrationally autoionizing states in the low-energy region, and direct dissociative recombination, driven by electronically autoionizing Rydberg states attached to higher-energy excited cation channels.

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