Title 



An exact coupled cluster theory for Moshinsky and Hookean twoelectron model atoms with spincompensated ground states
 
Author 



 
Abstract 



The Moshinsky (M) and Hookean (H) models of twoelectron atoms replace the electronnuclear interaction by harmonic forces. The difference between them resides in the interparticle interaction, the H model retaining e(2)/r(12) as in helium, whereas the M atom is entirely harmonic. Using a 'coupled cluster' representation that = exp((X) over cap)Phi, (X) over cap is shown to be the sum of a onebody operator (X) over cap (1) and a twobody contribution (X) over cap (2). For Phi taken as a product of Gaussian functions, the onebody operator (X) over cap (1), is of length scaling form. In the M model, (X) over cap (2) is proportional to r(12)(2), whereas in the H model it is given explicitly as an infinite series in powers of r(12). Finally, some comments are added about the Helike ions in the limit of large atomic number. (C) 2003 Elsevier B.V. All rights reserved.   
Language 



English
 
Source (journal) 



Chemical physics letters.  Amsterdam  
Publication 



Amsterdam : 2003
 
ISSN 



00092614
 
Volume/pages 



378:12(2003), p. 167171
 
ISI 



000185124600027
 
Full text (Publishers DOI) 


  
Full text (publishers version  intranet only) 


  
