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Tricationic metastability by symmetry restrictions: B-2(n+), n=3, 4

机译:对称性限制的趋势效应性:B-2(n +),n = 3,4

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To explain the experimentally observed metastability of the trication B-2(3+), we study this system by various ab-initio methods. Whereas the electronic ground state X-2 Sigma(+)(u) of B(2)(3+)turns out to be unstable, the potential energy curves of the lowest excited state 1(2)Pi(u) and of the quartet state 1(4)Sigma(-)(g) form barriers that support quasi-bound vibronic states. The lifetimes of these states are not only determined by the respective (dissociative) tunnelling rates, but also by possible radiative electronic transitions and predissociation via spin-orbit coupling, where the latter furnish the decisive decay mechanism for the low-lying vibronic levels. In case of the quadruply charged system B-2(4+), our computations do not predict any metastable states in the low-lying electronic spectrum. The deviation from a purely Coulombic repulsive behaviour in B-2(4+) is quantified by fitting the potential energy curves to a modified Murrell-Sorbie function.
机译:为了解释TRIPLED B-2(3+)的实验观察到的亚稳期性,我们通过各种AB-INITIO方法研究该系统。 虽然B(2)(3+)的电子地面X-2Σ(+)(+)(+)(+)(+)(+)(3)表示不稳定,但最低激励状态1(2)PI(U)的电位能曲线 四重奏状态1(4)σ( - - )(g)形成支持准界振动状态的屏障。 这些状态的寿命不仅由各自的(分离)隧道速率决定,而且通过旋转轨道耦合来确定可能的辐射电子转换和预测,其中后者提供用于低位振动水平的决定性衰减机制。 在二次充电系统B-2(4+)的情况下,我们的计算不会预测低洼电子谱中的任何亚稳态。 通过将潜在的能量曲线拟合到改进的Murrell-Sorbie功能,量化与B-2(4+)中纯库仑排斥行为的偏差。

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