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Calcium-hydrogen interactions for collisional excitation and charge transfer

机译:煤氢相互作用,用于碰撞激励和电荷转移

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摘要

The accurate highly correlated ab initio calculations for ten low lying covalent (2)Sigma(+) states of CaH molecule, and one ionic Ca+H- state, are performed using large active space and extended basis set, with special attention to the long-range (6-20 angstrom) region where a number of avoided crossings between ionic and covalent states occur. These states are further transformed to a diabatic representation using a numerical diabatization scheme based on the minimization of derivative coupling. This results in a smooth diabatic Hamiltonian which can be easily fit to an analytic form. The diagonal elements of the diabatic potentials were then empirically corrected to reproduce experimental dissociation energies. Though the emphasis is on the asymptotic region, the obtained spectroscopic constants are in good agreement with available experimental and theoretical data. The resulting analytical Hamiltonian, after back transformation to adiabatic representation, is used to obtain cross sections for different inelastic processes using both the multichannel and the branching probability current approaches. It is shown that while for most intense transitions both approaches provide very close results, the multichannel approach underestimates the cross sections of weak transitions, as a consequence of the short-range avoided crossings that are accounted for only in the branching probability current method. Published by AIP Publishing.
机译:CAH分子的10个低位躺线(2)Σ(+)和一种离子CA + H-状态的精确高度相关的AB初始计算,使用大型有源空间和延长的基础设定,特别注意长期 - 发生(6-20埃)区域,其中发生离子和共价状态之间的许多避免交叉。使用基于衍生物耦合的最小化的数值糖化方案,这些状态进一步转化为糖尿病表示。这导致光滑的糖尿病哈密顿,可以容易地适应分析形式。然后经验校正糖尿病电位的对角元件以再现实验解离能。虽然重点是渐近区域,但是获得的光谱常数与可用的实验和理论数据吻合良好。由此产生的分析Hamiltonian在后面转换为绝热表示之后,用于获得使用多通道和分支概率电流方法的不同内部过程的横截面。结果表明,虽然对于最强烈的转换,但两种方法都提供了非常接近的结果,因此多通道方法低估了弱转换的横截面,因为仅在分支概率电流方法中占用的短程避免交叉。通过AIP发布发布。

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  • 来源
    《The Journal of Chemical Physics》 |2017年第1期|共10页
  • 作者单位

    Univ Paris Est Lab Modelisat &

    Simulat Multiechelle UMR CNRS 8208 5 Bd Descartes F-77454 Marne La Vallee Champs Sur Marn France;

    Univ Paris Est Lab Modelisat &

    Simulat Multiechelle UMR CNRS 8208 5 Bd Descartes F-77454 Marne La Vallee Champs Sur Marn France;

    Herzen Univ Dept Theoret Phys &

    Astron Moika 48 St Petersburg 191186 Russia;

    Herzen Univ Dept Theoret Phys &

    Astron Moika 48 St Petersburg 191186 Russia;

    UPMC Univ Paris 06 Sorbonne Univ PSL Res Univ LERMA Observ Paris CNRS UMR 8112 F-92195 Meudon France;

    UPMC Univ Paris 06 Sorbonne Univ PSL Res Univ LERMA Observ Paris CNRS UMR 8112 F-92195 Meudon France;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 物理化学(理论化学)、化学物理学;
  • 关键词

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