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Electrostatic and relaxation effects in ionization of molecular dimers and intermolecular complexes
Author(s) -
Peel J. Barrie
Publication year - 1983
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/qua.560230235
Subject(s) - dimer , polarizability , chemistry , ionization , intermolecular force , ion , valence (chemistry) , ionization energy , relaxation (psychology) , molecule , monomer , chemical physics , atomic physics , computational chemistry , polymer , organic chemistry , social psychology , psychology , physics
The shifts in ionization energies which occur when a molecule is incorporated as an asymmetric dimer or in an intermolecular complex are analyzed theoretically. MO SCF calculations with 4–31 G basis sets were performed on closed‐ and open‐shell states of (HF) 2 , H 2 O·HF, and their valence–hole ions, as well as on the heterodimers incorporating the higher homologues CH 3 F, CH 3 OH, and (CH 3 ) 2 O. The analysis concerns the influence of electrostatic, polarization, and charge transfer effects associated with complexation on the initial molecular state of each monomer system, as well as monomer–dimer differences in the electronic relaxation mechanism considered as a final state effect in the ionization process. The calculated ionization energy shifts which agree well with the experimental data available for (CH 3 ) 2 O·HF, show that the shifts are dominated by electrostatic effects, but some effects arising from differences in molecular size and electric polarizability of the monomers can be discerned.