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Ground and lowest-lying electronic states of CoN. A multiconfigurational study

机译:CoN的基础和最低电子状态。多元配置研究

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The lowest-lying X-1 Sigma(+), a(3)Phi, b(3)Pi, c(5)Delta, A(1)Phi, and B-1 Pi electronic states of CoN have been investigated at the ab initio MRCI and MS-CASPT2 levels, with extended atomic basis sets and inclusion of scalar relativistic effects. Among the singlet states, the A(1)Phi and B-1 Pi states have been described for the first time. Potential energy curves, excitation energies, spectroscopic constants, and bonding character for all states are reported. Comparison with other early transition-metal nitrides (ScN, TiN, VN, and CrN), isoelectronic (NiC) and isovalent (RhN and IrN) species has been made, besides analyzing the B-1 Pi <-> X-1 Sigma(+) electronic transition in terms of Franck-Condon factors, Einstein coefficients, and radiative lifetimes. At both levels of theory, the following energetic order has been obtained: X-1 Sigma(+), a(3)Phi, b(3)Pi, c(5)Delta, A(1)Phi, and B-1 Pi, with good agreement with experimental results. In contrast, previous DFT and MRCI calculations predicted the ground state to be the (5)Delta state.
机译:位于CoN的最低电子X-1 Sigma(+),a(3)Phi,b(3)Pi,c(5)Delta,A(1)Phi和B-1 Pi电子态已得到研究。从头算起MRCI和MS-CASPT2水平,具有扩展的原子基础集和标量相对论效应。在单重态中,首次描述了A(1)Phi和B-1 Pi状态。报告了所有状态下的势能曲线,激发能,光谱常数和键合特性。与其他早期过渡金属氮化物(ScN,TiN,VN和CrN),等电子(NiC)和等价(RhN和IrN)物种进行了比较,除了分析了B-1 Pi-X-1 Sigma( +)根据弗兰克-康登因子,爱因斯坦系数和辐射寿命的电子跃迁。在两个理论水平上,都获得了以下能量顺序:X-1 Sigma(+),a(3)Phi,b(3)Pi,c(5)Delta,A(1)Phi和B-1 ,与实验结果吻合良好。相反,先前的DFT和MRCI计算预测基态为(5)Delta状态。

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