Deposition of mass-selected ions in neon matrices: CS2+ and C6F6+

Infrared and visible absorption spectra and laser-induced fluorescence (LIF ) and excitation spectra are obtained for several simple cations deposited from a mass-selected ion beam. In the present preliminary study we demonstr ate successful and clean mass selection by presenting spectra of samples ob tained by depositing the isotopic (SCS+)-S-34-C-12-S-32 ion in natural isot opic abundance, and analyzing its spectrum. Spectra of C6F6+ deposited from a 20 eV ion beam exhibit quite different inhomogeneous line profiles, sugg esting that even the relatively low kinetic energy results in considerable damage to the solid. Analysis of the spectra indicates that the Jahn-Teller -distorted vibrational structure in the doubly degenerate ground state of C 6F6+ is strongly perturbed in the newly formed sites, which are presumably of lower symmetry. A 33-46 cm(-1) splitting of the origin and other totally symmetric bands in emission is tentatively attributed to the spin-orbit sp litting in the E-2(1g) ground state. (C) 2000 American Institute of Physics . [S1063-777X(00)02109-5].