Multi-component molecular orbital study on positron attachment to alkali-metal hydride molecules: nature of chemical bonding and dissociation limits of [LiH; e+]

Multi-component molecular orbital study on positron attachment to alkali-metal hydride molecules: nature of chemical bonding and dissociation limits of [LiH; e+]
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正电子与碱金属氢化物分子附着的多组分分子轨道研究:化学键的性质和[LiH;解离极限]

DOI:
10.1140/epjd/e2014-40708-4
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发表时间:
2014
期刊:
Eur. Phys. J. D
影响因子:
--
通讯作者:
T. Oyamada and M. Tachikawa
T. Oyamada and M. Tachikawa
中科院分区:
--
文献类型:
--
作者:
Yurika Yamada;Yukiumi Kita;and Masanori Tachikawa;T. Oyamada and M. Tachikawa

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我们进行了多组分全组态相互作用的计算,以调查在小和大的核间距的化学键的性质[LiH;e+]。我们讨论了几何变化的重要性,在正电子化合物中诱导的正电子附着的维里定理,与绝热和垂直的正电子亲和力(PA)的比较。还讨论了通过优化(i)分子几何形状和(ii)正电子基中心实现的PA值的系统改进。通过对[LiH;e+]的势能曲线和电子、正电子密度的分析,将[LiH;e+]的稳定解离通道与其母体分子LiH的离子解离通道和中性解离通道进行了比较。给出了垂直方向的PA随的变化关系,它是母体分子(LiH → Li + H)与其正电子化合物([LiH; e+] → Li + [H; e+])的势能曲线之差。与之前的研究不同[M。梅拉等人,J.Chem.Phys.113,6154(2000)],由于长程离子键合相互作用,需要比玻尔更多的时间来收敛垂直PA。
We have performed multi-component full-configuration interaction calculations to investigate the nature of chemical bonding of [LiH;e+] at the small and large internuclear distance. We discuss the importance of geometrical changes in positronic compounds induced by a positron attachment in terms of the virial theorem, with a comparison of the adiabatic- and vertical-positron affinity (PA). The systematic improvement of the PA values achieved by optimisation of (i) the molecular geometry and (ii) the positronic basis centre is also discussed. The stable dissociation channel of [LiH;e+] is compared with the ionic- and neutral-dissociation channels of its parent molecule LiH through the analysis of the potential energy curve and the electronic and positronic densities. The vertical PA as a function of is also presented, which is the difference between the potential energy curve of the parent molecule (LiH → Li + H) and its positronic compound ([LiH; e+] → Li + [H; e+]). Unlike the preceding study of [M. Mella et al., J. Chem. Phys.113, 6154 (2000)], it took more than bohr to converge the vertical PA due to the long-range ionic bonding interaction.
M.Tachikawa:“通过全 CI 波函数同时优化电子和正电子的高斯型函数指数 - 应用多组分分子轨道方法应用于正电子化合物的基态和激发态”化学物理
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