T. Vanmourik et al., REMOVAL OF DEPENDENCIES FROM NEARLY COMPLETE BASIS-SETS - CALCULATIONS ON THE HELIUM DIMER, International journal of quantum chemistry, 63(4), 1997, pp. 805-815
A method is devised for dealing with almost linearly dependent basis s
ets that contain large sets of bond functions. Using the largest of su
ch basis sets, LARSAT, the second-order Moller-Plesset polarization di
spersion energy of the helium dimer is calculated to be -17.08 K at R
= 5.6 bohrs. MR-SDCI calculations, employing a set of 37 reference con
figurations, were performed for the helium dimer with several basis se
ts at 4.0 and 5.6 bohrs. Size-extensivity corrections were included to
take into account the R dependency of the size-extensivity error in M
R-SDCI calculations. The He-2 interaction energies computed with basis
LARSAT are -10.92 K at 5.6 bohrs and 295.1 K at 4.0 bohrs. The 37-MR-
SDCI calculations with basis LARSAT almost reproduce the He-2 full con
figuration interaction (CI) interaction energies computed with the sam
e basis, at notably smaller cost. (C) 1997 John Wiley & Sons, Inc.