Bressanini Dario
Dipartimento di Scienza e Alta Tecnologia, Università dell'Insubria, Via Valleggio 9, I-22100 Como, Italy.
J Chem Phys. 2022 Apr 21;156(15):154302. doi: 10.1063/5.0089157.
Two new positronic molecules have been recently discovered: eH [Charry et al., Angew. Chem., Int. Ed. 57, 8859 (2018)] and (PsH) [D. Bressanini, J. Chem. Phys. 155, 054306 (2021)]. These molecules seem to be stabilized by a new type of bond, the positronic bond, where one or two positrons are directly responsible for the bonding of two otherwise repelling negative ions. We show that an additional positron can attach to (PsH) to form a locally stable species with three positrons whose potential energy curve shows an equilibrium structure at about 8 bohr and a binding energy of 11.5(5) mhartree with respect to the dissociation into PsH + ePsH. This molecule, tentatively called e(PsH), is the first system with three positrons discovered.
eH [查里等人，《德国应用化学》，国际版57, 8859 (2018)] 和 (PsH) [D. 布雷萨尼尼，《化学物理杂志》155, 054306 (2021)]。这些分子似乎是由一种新型键——正电子键稳定的，在这种键中，一个或两个正电子直接负责两个原本相互排斥的负离子的键合。我们表明，一个额外的正电子可以附着到 (PsH) 上，形成一个具有三个正电子的局部稳定物种，其势能曲线显示在约8玻尔处有一个平衡结构，相对于分解为PsH + ePsH的结合能为11.5(5) 毫哈特里。这个分子，暂称为e(PsH)，是发现的第一个具有三个正电子的系统。
