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Paper
Phys. Chem. Chem. Phys., 2007, 9, 127 - 130, DOI: 10.1039/b613109c
Gas-phase electronic spectrum of the C14 ring
A. E. Boguslavskiy and J. P. Maier
The electronic spectrum of a cyclic C14 in the visible range has been detected in the gas phase by a mass selective resonant two-color two-photon ionization technique coupled to a laser ablation source. Absorption is localized in the 19 000 to 20 000 cm–1 region and appears as a dozen of 3–7 cm–1 narrow peaks belonging to one or two close-lying electronic states. Bands have structures which for the narrowest ones is likely to be the rotational profile contour. The spectrum is attributed to a cyclic form of C14 based on time-dependent density-functional calculations and reactivity with H2. The spectral pattern differs from that previously seen in the larger C4n+2 member rings, C18 and C22, indicating some sort of a structural crossover.
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