Abstract
Strong (1+2) resonance-enhanced multiphoton ionization (REMPI) spectra have been recorded for cyanogen resonantly excited by single photon absorption on vibronically allowed transitions to the à 1Σu− and B̃ 1Δu electronic states at wavelengths from 205 to 220 nm. A previously unreported Fermi resonance between the ν2 and 4ν5 vibrational modes of the à state is observed for the rotationally resolved spectra of transitions that involve excitations of the ν2 mode. New measurements of vibrational and rotational spectroscopic constants are reported for the à and B̃ electronic states. A detection limit of 120 ppb measured for (1+2) REMPI of cyanogen is an order of magnitude larger than typical (2+1) REMPI detection limits for other aliphatic compounds.
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