The coupled-cluster method in an open-shell version with non-Hen&an model interaction is applied for direct calculation of vertical ionization potentials of closed-shell molecular systems. The theory is illustrated by calculation of vertical ionization potentials of the water molecule. The calculate
Calculations of vertical ionization potentials of CF4 and SiF4 by the green-function method
β Scribed by P. Lazzeretti; R. Zanasi
- Publisher
- Elsevier Science
- Year
- 1976
- Tongue
- English
- Weight
- 380 KB
- Volume
- 42
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
Green-function method is empXoyed, within the framework of the CNDU approu-imation to the zero-order wavefunction, to c!dculate the photoelectron spectrum of the CF4 and SiF4 molecules, The agreement between theoretical and euperimental ionization potentials is quite good aitd a sensible ~prove~ent with respect to Koopmans' ~p~rox~~~ion is obtained.
Two different expansions for the self-energy are discussed.
π SIMILAR VOLUMES
The valence and core ionization potentials of Ne, Mg, and Hz0 have been calculated by using the one-body Green's function. The self-energy part WBS taken to include the second order and the w2dcpcndent terms, third order ita the perturbation.
The vertical ionization potentials of nine small molecules were computed by the deMon density functional program and different versions of the transition-state method and the results were compared with earlier calculations and with experiment. The average absolute deviation of the 38 computed ioniza
The vcrtlcat lonlz;lhon pokntlalsof Or\*, HNrz and Cl12r2 wcrc colnputcd by Raylclgb-SLhrodlnfcr purturbatlon corrcchons to Koopmans' theorem. Compxrlson of the rvcragc absolute devlatlon of 21 lomzahon potcnt!dls from c\pcrlmcnt lndlcates ngndiunt nnprovcmcnt over prcvlous large-scale frozcn-orbnal