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Chinese Physics, 2005, Vol. 14(6): 1101-1107    DOI: 10.1088/1009-1963/14/6/008
ATOMIC AND MOLECULAR PHYSICS Prev   Next  

Hybrid CIS-DFT method to study electric field effects on electronic excited states of ethylene

Ma Mei-Zhong (马美仲)ab, Zhu Zheng-He (朱正和)a, Chen Xiao-Jun (陈晓军)c, Xu Guo-Liang (徐国亮)a, Zhang Yong-Bin (张永彬)a, Mao Hua-Ping (毛化平)a, Shen Xiao-Hong (谌晓洪)a
a Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China; b College of Physics and Eelectronic Engineering, Yantai Normal University, Yantai 264025, China; c China Academy of Engineering Physics, Mianyang 621900, China
Abstract  The present work is devoted to the study of the effects of external dipole electric field on the molecular structure of ethylene using a hybrid method which combines the single-excitation configuration interactions (CIS) with density functional theory(DFT), i.e. CIS-DFT(B3LYP). It is found that the effects of electric dipole field on the molecular geometry (D2h, D2d and C2v), dipole moment, transition dipole moment, polarizability and, particularly, excitation energy of ethylene are rather remarkable. The advantages of hybrid CIS-DFT method are that it can determine the symmetry of molecule and the correct order of excitation as well as the Molecular Orbital(MO) electron configuration, thereby the electronic excitation states of ethylene are easily derived out, and most of them are in agreement with those obtained in experiments or references. It may be the first time the effects of external electric field on ethylene molecule have been considered. Compared with other ab initio methods, the CIS-DFT method is relatively accurate and low in computation cost. We expect that it can be used to study other closed-shell molecules.
Keywords:  excited state      hybrid CIS-DFT method      electric dipole field  
Received:  16 April 2004      Revised:  22 February 2005      Accepted manuscript online: 
PACS:  31.15.E-  
  31.15.vq (Electron correlation calculations for polyatomic molecules)  
  33.15.Bh (General molecular conformation and symmetry; stereochemistry)  
  33.15.Kr (Electric and magnetic moments (and derivatives), polarizability, and magnetic susceptibility)  
Fund: 国家自然科学基金资助(10376022)

Cite this article: 

Ma Mei-Zhong (马美仲), Zhu Zheng-He (朱正和), Chen Xiao-Jun (陈晓军), Xu Guo-Liang (徐国亮), Zhang Yong-Bin (张永彬), Mao Hua-Ping (毛化平), Shen Xiao-Hong (谌晓洪) Hybrid CIS-DFT method to study electric field effects on electronic excited states of ethylene 2005 Chinese Physics 14 1101

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