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IR, NIR, and UV Absorption Spectroscopy of C602+ and C603+ in Neon Matrixes

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journal contribution
posted on 17.12.2015, 00:28 by Bastian Kern, Dmitry Strelnikov, Patrick Weis, Artur Böttcher, Manfred M. Kappes
C602+ and C603+ were produced by electron-impact ionization of sublimed C60 and charge-state-selectively codeposited onto a gold mirror substrate held at 5 K together with neon matrix gas containing a few percent of the electron scavengers CO2 or CCl4. This procedure limits charge-changing of the incident fullerene projectiles during matrix isolation. IR, NIR, and UV–vis spectra were then measured. Ten IR absorptions of C602+ were identified. C603+ was observed to absorb in the NIR region close to the known vibronic bands of C60+. UV spectra of C60, C60+, and C602+ were almost indistinguishable, consistent with a plasmon-like nature of their UV absorptions. The measurements were supported by DFT and TDDFT calculations, revealing that C602+ has a singlet D5d ground state whereas C603+ forms a doublet of Ci symmetry. The new results may be of interest regarding the presence of C602+ and C603+ in space.