B (2)Sigma(u)+ <-- X (2)Pi(g) electronic spectrum of NCCN+ in the gas phase.

The B (2)Sigma(u)(+) <-- X (2)Pi(g) absorption spectrum of NCCN(+) in the gas-phase was observed using a two-color, two-photon photodissociation technique. This was measured at approximately 20 K in a 22-pole ion trap with laser bandwidths of less than a cm(-1). The spectrum shows distinct vibrational structure, with the origin band near 11,253 cm(-1), and the excitation of four normal modes in the excited state. The rotational structure of the 0(0)(0) band in the gas phase could not be resolved, indicating that the B (2)Sigma(u)(+) state has a lifetime of a few picoseconds because of a fast intramolecular process.

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