Abstract
We have employed a line-narrowed tunable ArF excimer laser (λ ≈ 193 nm) together with laser-induced fluorescence, resonant multiphoton ionization, and time-of-flight (TOF) ion detection techniques to investigate multiphoton dissociation and ionization channels in diatomic molecules induced by UV photons. We have excited such systems as CO, O2, H2, and NO through intermediate states to final states which are unstable against decomposition. Subsequently, we measure the fluorescence spectra and/or the kinetic energy spectra of both neutral and ionic fragments to determine branching ratios and Internal state distributions. Our measurements are carried out at field strengths of 1010–1011 W/cm2, which allow both weak and nonlinear multiphoton decomposition channels to be studied. Simultaneously, however, this combination of high field strength and short-wavelength radiation infuses other nonlinear features into the spectra, which must be properly treated (e.g., the ac Stark effect and postdecomposition excitation of the fragments).
© 1989 Optical Society of America
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