Some <i>ab initio</i> thoughts on the bonding in O<sub>3</sub>H
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We study the ground X~2A′′ state of O<sub>3</sub>H (= O<sub>a</sub>O<sub>b</sub>O<sub>c</sub>H) with single (RCCSD(T)) and multi (MRCI) reference correlation methods in order to shed some light on its bonding mechanism in connection with its low dissociation energy and rather long bond distance (O<sub>a</sub>O<sub>b</sub>−O<sub>c</sub>H). For such a task all three dissociation/formation paths were considered (O<sub>2 </sub>+ OH, O + O<sub>2</sub>H, and O<sub>3 </sub>+ H) and the associated nonadiabatic coupling matrix elements were examined. It appears that the excited states of the above asymptotic fragments participate in the equilibrium wavefunction of O<sub>3</sub>H in a way that results in a symmetry broken structure.
本研究采用单参考（RCCSD(T)）与多参考（MRCI）相关电子结构方法，对O₃H（即OₐOᵦO꜀H）的基态X~2A''态开展理论探究，以期阐明其成键机制——该机制与其低解离能及较长的OₐOᵦ−O꜀H键长密切相关。为完成此项研究，我们考量了全部三条解离/形成路径：O₂ + OH、O + O₂H与O₃ + H，并对与之相关的非绝热耦合矩阵元进行了考察。研究结果表明，上述渐近解离碎片的激发态以特定方式参与O₃H的平衡波函数，最终使体系呈现对称性破缺结构。
