# SPECTROSCOPY OF CARBON CLUSTER ANIONS IN ARGON MATRICES

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/13694

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 Title: SPECTROSCOPY OF CARBON CLUSTER ANIONS IN ARGON MATRICES Creators: Szczepanski, J.; Ekern, S.; Vala, Martin Issue Date: 1996 Abstract: Carbon cluster anions ($C_{2a}$ with n=3-18) have been generated via a laser-induced graphite/Ar plasma with low energy electron beam access. The negative carbon cluster ions, partially extracted from a vaporization region, were trapped in an argon matrix at 20K. Absorption bands have been observed from 615 8nm to 6097.5nm. Shorter wavelength bands correspond well to the Ne matrix-isolated, mass selected $C_{6}^{-}$ through $C_{20}^{-}$ cluster bands observed by Maier and coworkers $^{a}$. Longer wavelength bands fit the $0^{\prime\prime}_{0}$ electronic transitions expected by free electron molecular orbital (FEMO) model for the even carbon anion linear chain series well and extend it to $C_{36}^{-}$. The asymmetric mode frequencies for small carbon cluster anions will be reported. The significance of these measurements for observations from unknown species in interstellar space will be discussed. URI: http://hdl.handle.net/1811/13694 Other Identifiers: 1996-TH-04