The fundamentals: The IR spectrum of the adamantane cation, C10H16+, has been derived by resonant IR photodissociation of weakly bound C10H16+⋅Ln clusters (see picture). The analysis of the IR spectrum provides the first spectroscopic characterization of this fundamental cycloalkane carbocation in the gas phase and direct evidence for the Jahn–Teller distortion in the 2A1 ground electronic state.
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