Sr. Andrews et De. Parry, A COMPARATIVE-STUDY OF THEORETICAL METHODS FOR THE ANALYSIS OF HIGH-RESOLUTION DOUBLE-CHARGE-TRANSFER SPECTRA, APPLIED TO THE ETHENE MOLECULE, Rapid communications in mass spectrometry, 7(6), 1993, pp. 552-554
The low-energy electronic states of the ethene dication are investigat
ed theoretically, a comparison being made between the predictions of t
he ab initio ADC(2) Green's function method and of the recently develo
ped semi-empirical MSXalpha method. Both methods provide a consistent
unambiguous analysis of the closely-spaced peak structure recently obs
erved in a high-resolution double-charge-transfer spectrum for the eth
ene molecule.