Abstract
The technique of laser induced predissociation and laser induced fluorescence is applied to study spectra of gas-phase molecular ions. The main feature of the experiment is a beam of mass selected molecular ions illuminated by a pulsed dye laser. Over an extended range of excitation energies spectroscopic information can be obtained about positive and negative ions including transient species. As a first result we present predissociation spectra of O 2 + ,b 4 bE − −a 4 π u Δv=3 andgDv=2 which can well be simulated by calculated spectra assuming a rotational ion temperature of 300δK.
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