Deposition of mass-selected ions in neon matrices: CS2+ and C6 F6+

Low-Temperature Physics and Chemistry in Cryomatrice

Анотація

Infrared, visible absorption as well as 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 demonstrate the successfull and clean mass selection by presenting spectra of samples obtained by depositing the isotopic ³⁴S¹²C³²S⁺ ion in natural isotopic abundance, and analysing its spectrum. Spectra of C₆F₆⁺ deposited from a 20 eV ion beam exhibit quite different inhomogeneous line profiles, suggesting that even the relatively low kinetic energy results in considerable damage of the solid. Analysis of the spectra indicates that the Jahn√Teller distorted vibrational structure in the doubly degenerate ground state of C₆F₆⁺ 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 splitting in the ²E_1g ground state.