Av. Arbuznikov et M. Hendrickx, On the local structure of the correlation factor for the ground state of the helium atom, CHEM P LETT, 334(4-6), 2001, pp. 325-329
The correlation factor in the explicitly correlated wave function for the g
round state of the helium atom has been analyzed. The general structure of
the correlation factor (including its angular dependency) in the region of
small viz has been obtained. The 'extent of non-sphericity' of the correlat
ion factor, g(r(1), r(2), r(12)), is proportional to the first derivative o
f logarithm of the 'coalescence function' h(r) = g(r, r, 0). (C) 2001 Elsev
ier Science B.V. All rights reserved.