Abstract

Benzyl and tropyl in charge: Electronic spectra of mass-selected benzylium (Bz+) and tropylium (Tr+) cations embedded in solid neon are reported for the first time. They reveal a weak (1)1B1←1A1 visible (see picture) and a much stronger (1)1A1←1A1 ultraviolet transition for Bz+ (C2v symmetry). The lowest dipole-allowed 1A′′2←1A′1 absorption in the ultraviolet region for Tr+ (D7h) is also observed.

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