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[求助]
GAUSSIAN怎么計算overlap matrix?
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本人非專業(yè)GAUSSIAN使用者,請問GAUSSIAN怎么計算overlap matrix , molecular orbital coefficients and energies ?如果可以,請列出輸入文件,謝謝! F0= SCC ,沒法顯示…… where S is the intermolecular overlap matrix, and C and are the dimer Kohn-Sham orbital’s coefficients and energies. The noninteracting molecular orbitals of the two individual molecules are calculated separately by the standard self- consistent field procedure. These noninteracting orbitals are then used to construct the dimer Kohn-Fock matrix. Namely, it takes directly the unperturbed individual molecule’s orbital and density matrix to guarantee that originally, the two mol- ecules are noninteracting, and only when putting them to- gether, one can get interaction information with respect to the individual molecules in the spirit of first-order perturba- tion. All of the calculations are performed with the GAUSSIAN 03 package 詳細的請看PHYSICAL REVIEW B 79, 115203 2009 [ Last edited by 賀儀 on 2011-10-17 at 16:20 ] |

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專家顧問 (職業(yè)作家)
地溝油冶煉專家
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小才
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為什么只是算兩個分子HOMO之間的呢?而且還只是overlap integral呢? 兩個分子之間的作用并不是二者HOMO之間的作用,把兩個分子放在一起算,之間的作用就都有了。 當然如何放分子,可以觀察A的HOMO與B的LUMO,或者A的LUMO與B的HOMO,看二者如何搭配、放置作為初始優(yōu)化的起點比較好。優(yōu)化的結(jié)果就得到了兩個分子之間的作用了。 兩個分子之間的overlap integral,只是軌道(用基組表達的)之間的,說明不了問題。要考察的是重疊布居。 將AB的計結(jié)果在Multiwfn中求全AB的電子密度ρAB,并在Multiwfn中進一步分別求分子片A、分子片B的電子密度ρa、ρB。求電子密度差Δρ=ρAB-ρa-ρB。 這時Δρ就是分子片A、分子片B之間的重疊布居。 [ Last edited by zhou2009 on 2011-10-17 at 19:30 ] |

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