Ab initio CI calculations using a large spd-basis with polarisation functions have been obtained for the ground state of S2N2 and for many doublet state radical cations of each symmetry. All valence shell electrons were considered in the CI, leading to markedly lower energies than previous work. All doublet states down to about 20 eV have probably been found - this leads to a more general description of the UV-photoelectron spectrum, but the principal IP's are still assigned according to our previous work. Some deficiencies in the Green's Function/Tam Dancoff Method have been noted. The principal groups of shake-up states seem to agree with weak structure in the observed spectrum.
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