F. Rakowitz et al., Ground and excited states of PtCH2+: assessment of the no-pair Douglas-Kroll ab initio model potential method, PHYS CHEM P, 2(11), 2000, pp. 2481-2488
Relativistic all-electron and ab initio model potential (AIMP) calculations
have been performed on the PtCH2+ ground and low-lying excited states empl
oying a one-component Hamiltonian. Electron correlation is taken into accou
nt by means of a multireference configuration interaction treatment whereas
spin-orbit coupling effects have been added as a perturbation. The no-pair
Douglas-Kroll ab initio model potential method is found to reproduce all-e
lectron results excellently. The one-center spin-orbit mean-field Douglas-K
roll ab initio model potential approach appears to be a competitive means f
or electronic structure calculations on compounds containing heavy elements
. An analysis of the PtCH2+ electronic ground state structure reveals that
both the Pt+ configurations d(9) and d(8)s(1) participate in the double bon
d. This finding differs to some extent from a model postulating that a d(8)
s(1) structure is preferred.