Document Detail

Nonadditive interactions in ns2 and spin-polarized ns metal atom trimers.
MedLine Citation:
PMID:  19045085     Owner:  NLM     Status:  PubMed-not-MEDLINE    
The origins of nonadditivity in the following groups of metal trimers are examined: alkali earth metals of the IIA group (Be, Mg, and Ca), Zn as a transition metal analog of this group, spin-polarized alkali metals from IA group (Li, Na, K), and the spin-polarized Cu as its transition metal analog. The nonadditive interactions in these trimers are analyzed using the following hierarchy of approximations: the Heitler-London, self-consistent field (SCF), and correlated levels of theory. The exchange nonadditivity, which is included at the Heitler-London level, constitutes a bulk of nonadditive interactions in these systems in their equilibrium structures. The SCF treatment reveals some unphysical characteristics. At the post-SCF levels of theory the multireference character of the wave function increases from atom to dimer to trimer. The role of configurations involving excitations ns-np increases in this sequence and it is the genuine nonadditive effect. There is also a dramatic change in the characteristics of the excited states upon formation of clusters. We use the parameters of these excited states to predict which complexes are bound by the unusually strong nonadditive interactions and which are not.
Jacek Kłos; Piotr S Zuchowski; Łukasz Rajchel; Grzegorz Chałasiński; Małgorzata M Szcześniak
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of chemical physics     Volume:  129     ISSN:  1089-7690     ISO Abbreviation:  J Chem Phys     Publication Date:  2008 Oct 
Date Detail:
Created Date:  2008-12-02     Completed Date:  2009-01-15     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0375360     Medline TA:  J Chem Phys     Country:  United States    
Other Details:
Languages:  eng     Pagination:  134302     Citation Subset:  -    
Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA.
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