Abstract
Resonance-enhanced multiphoton ionization (REMPI) has been widely applied for sensitive detection of molecules at low concentrations.1 In investigations of a range of dynamic effects, such as photodissociation, gas-phase reactions, and molecule-surface interactions, this process has been used as a spectroscopic method to deduce the rovibrational population distribution of the product molecules. In contrast to the case of laser-induced fluorescence. REMPI requires detailed knowledge of both excitation steps, i.e., of the first step from the initial state to another bound electronic state and of the second step in which the molecule in its excited state is ionized. For the first step, which yields the state selectivity of the technique, a wealth of spectroscopic data on transition energies and line strengths is available. Few theoretical or experimental results exist, however, concerning the transition leading to ionization.
© 1989 Optical Society of America
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