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, 1967, currens


Publication




Amsterdam
:
2003


ISSN




00092614
[print]
18734448
[online]


DOI




10.1016/S00092614(03)012557


Volume/pages




378
:12
(2003)
, p. 167171


ISI




000185124600027


Full text (Publisher's DOI)






Full text (publisher's version  intranet only)





