LiBe+分子基态及其低电子激发态
ACTA CHIMICA SINICA(2011)
Abstract
采用Davidson校正的多参考组态相互作用方法(MRCI+Q)和多参考平均二次耦合团簇方法(MRAQCC)结合基组ROOS-ANO-TZP得到了LiBe+分子基态(x1∑+)以及六个低电子激发态(a3Σ+,b3∏,A1∑+,B1∏,c3∑+,C1∑+)的势能曲线(PECs).计算结果表明:X1∑+,a3∑+,b3∏和B1∏为弱束缚态,A1∑+,c3∑+和C1∑+为排斥态.接着确定出束缚态的平衡键长Re,并将得到的势能曲线在全区域拟合到Murrell-Sorbie(MS)解析势能函数形式,从而获得各束缚电子态的光谱数据.基态X1Σ+的平衡键长为0.263 nm,谐振频率ωe为316 cm-1,离解能De为0.57 eV.a3∑+,b3∏和B1∏分别位于基态2.45,3.10,5.47 eV之上,平衡核间距分别为0.297,0.270,0.284 nm,相应的谐振频率为272,236和257 cm-1.排斥态A1∑+,c3∑+和C1∑+对应的垂直激发能Tv分别为4.75,6.43,6.72 eV.目前计算值和文献结果符合得非常好.最后在束缚态的平衡结构附近做Dunham展开,获得的光谱常数与MS结果一致,据此得到x1∑+,a3∑+,b3∏和B1∏态的部分振动能级.
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Key words
LiBe+,multi-reference configuration interaction method,analytical potential energy function,spectroscopic constant,vibrational level
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