Quantum Features of Anionic Species He*鈥?and He2*鈥?in Small HeN Clusters

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• 作者：Pablo Villarreal ; Roc铆o Rodr铆guez-Cantano ; Tom谩s Gonz谩lez-Lezana ; Rita Prosmiti ; Gerardo Delgado-Barrio ; Franco A. Gianturco
• 刊名：Journal of Physical Chemistry A
• 出版年：2015
• 出版时间：November 25, 2015
• 年：2015
• 卷：119
• 期：47
• 页码：11574-11582
• 全文大小：499K
• ISSN：1520-5215

文摘

We present variational calculations on systems containing a few boson helium atoms attached to electronically excited atomic and molecular helium anions He^{*鈥?/sup> and He₂*鈥?/sup> and characterize their structures and energetics. Previously reported high-level ab initio results [Huber, S. E.; Mauracher, A. Mol. Phys. 2014, 112, 794] to describe the interactions between excited (metastable) anions and a neutral He atom have been employed. For the case of the atomic species He*鈥?/sup>, the corresponding interaction with He suggests large anharmonicity effects due to the presence of a deep well of 鈭?7鈥?00 cm鈥? at short distances, together with a more external shallow secondary well of 鈭? cm鈥?, both supporting bound levels. Moreover, when a sum of pairwise interactions is assumed to describe the full PES corresponding to the presence of several neutral He atoms, geometrical constraints already predict the complete solvation of the anionic impurity by six helium atoms, giving rise to a bipyramidal structure. In turn, for the anisotropic weak interaction He鈥揌e₂*鈥?/sup>, where the anionic dimer is considered as a rigid rotor, the obtained structures show the tendency of the helium atoms to pack themselves together and largely far away from the dopant, thereby confirming the heliophobic character of He₂*鈥?/sup>.}