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首页> 外文期刊>Chemical Physics Letters >ON THE INHERENT DIVERGENCE IN THE MOLLER-PLESSET SERIES - THE NEON ATOM - A TEST CASE
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ON THE INHERENT DIVERGENCE IN THE MOLLER-PLESSET SERIES - THE NEON ATOM - A TEST CASE

机译:关于MOLLER-PLESSET系列的内在散度-氖原子-一个测试案例

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摘要

It has recently been shown that Moller-Plesset perturbation calculations may diverge for single configuration dominated systems in extended basis sets. We examine the origin of this divergence using the neon atom as a test example. The lowest energies for total symmetric states are calculated for values of the perturbation parameter strength z is an element of[-1, 1]. For z approximate to(-0.9)-(-0.8) avoided crossings between the Hartree-Fock configuration dominated state and states dominated by quintuple and higher excitations are observed. The origin of the divergence is therefore ''back door'' intruder states, that are highly excited relative to the Hartree-Fock state. [References: 20]
机译:最近显示,在扩展基集中,对于单一配置为主的系统,Moller-Plesset扰动计算可能会有所不同。我们使用氖原子作为测试示例来检验这种发散的根源。对于扰动参数强度的值,计算出总对称状态的最低能量z是[-1,1]的元素。对于z近似于(-0.9)-(-0.8),可以避免在Hartree-Fock构型主导态和五重态主导态之间发生交叉,并观察到更高的激发。因此,差异的根源是“后门”入侵者状态,相对于Hartree-Fock状态而言,这些状态非常令人兴奋。 [参考:20]

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