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The lowest-lying electronic states of BeMg

机译:BeMg的最低电子状态

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摘要

In this study, potential energy curves for the lowest-lying electronic states correlating with the first four dissociation channels were determined using the cc-pVQZ basis sets and CASSCF/MRCI wavefunctions. All valence orbitals plus one set of s and p correlation functions were included in the active space. A whole set of spectroscopic constants completes the characterization of each state. In its ground state (X(1)Sigma(+)), BeMg is weakly bound (D-e = 0.05 eV) and consequently, has a long internuclear equilibrium distance (R-e = 3.300 Angstrom, omega(e) = 44.2 cm(-1)). In previous theoretical works, the internuclear equilibrium distance was calculated to be around 4.5 Angstrom (SCF, CCD, and CEPA methods) and 5.1 Angstrom (QCID method). (C) 2003 Elsevier Science B.V. All rights reserved. [References: 34]
机译:在这项研究中,使用cc-pVQZ基集和CASSCF / MRCI波函数确定了与前四个解离通道相关的最低电子态的势能曲线。所有的价轨道加上一组s和p相关函数都包含在活动空间中。整套光谱常数完成了每个状态的表征。在其基态(X(1)Sigma(+))中,BeMg弱结合(De = 0.05 eV),因此具有长的核间平衡距离(Re = 3.300埃,omega(e)= 44.2 cm(-1) ))。在先前的理论工作中,核之间的平衡距离经计算约为4.5埃(SCF,CCD和CEPA方法)和5.1埃(QCID方法)。 (C)2003 Elsevier Science B.V.保留所有权利。 [参考:34]

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