National Changhua University of Education Institutional Repository : Item 987654321/10058

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NCUEIR > College of Science > Department of Chemistry > Periodical Articles > Item 987654321/10058

Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/10058

Title:	Computational Study of Vertical Ionization Potentials Using Density Functional Theory and Green's Function Methods
Authors:	Hu, Ching-Han;Chong, D. P.
Contributors:	化學系
Date:	2000-02
Issue Date:	2012-05-03T06:16:55Z
Publisher:	中國化學會
Abstract:	Over one hundred vertical ionization potentials (VIPs) were computed using density functional theory (DFT) and Green's function (GF) based methods. The DFT approaches include the unrestricted transition state (uTS) and unrestricted diffuse ionization (uDI) approximations using the Becke88-Perdew86 exchange-correlation functional. Green's function methods include the outer-valence GF (OVGF) approach, the parametrized GF2 (pGF2), and the parametrized GF2 times screened interaction (pGW2) approximations. DFT computations of IPs using the uTS approximation was found to be nearly as accurate as those predicted using the elaborate OVGF method. The much more computationally efficient uDI approximation provides predictions of moderate accuracy and is recommended for computing IPs for larger molecules. We have observed that the average absolute deviations from a uDI calculation using poorer basis set (DZVP) and poorer geometry (AM1 optimization) is only slightly larger.
Relation:	J. Chin. Chem. Soc., 47(1): 141-147
Appears in Collections:	[Department of Chemistry] Periodical Articles

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