Abstract
Double ionization of C2H5I, n-C3H7I and n-C4H9I has been investigated experimentally using double-charge-transfer spectroscopy. On the assumption that spin is conserved in the double-electron-capture reactions, and because of the use of OH+ as the projectile ion, it is probable that triplet states of the dications were populated. Peaks in the spectra were interpreted in terms of the electronic transitions giving rise to double-ionization energies calculated using a semi-empirical version of the multiple scattering Xα(MSXα) method of molecular orbital calculations. The density of states was found to increase as the alkyl chain-length increased, and most of the peaks observed were interpreted as being due to transitions to groups of close-lying states. In addition to the use of the MSXα method, ab initio double-ionization energies to the lowest triplet states of the dications were calculated.
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