Laser-induced photodissociation of chloroethane molecular ions in the gas phase

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Abstract
Photodissociation of the chloroethane molecular ion (C2H5Cl+) has been carried out in a pulsed ion cyclotron resonance (icr) mass spectrometer using a flashlamp‐pumped dye laser. The relative photodissociation cross section and the ratio of the cross sections for the production of the two photoproduct ions (C2H4+, C2H5+) are reported as a function of excitation wavelength betwen 691 and 455 nm. Structure observed in both the photodissociation spectrum and the branching ratio spectrum indicates that dissociation occurs predominantly from excited electronic states of the molecular ion. Some indication of the qualitative features of the excited state potential surfaces is also given.