Abstract
Recent advances in the generation of ultrashort laser pulses have made possible the investigation of chemical dynamics on a subpicosecond time scale, revealing details of the transition states region between reactants and products. We describe the development and characterization of a new apparatus capable of simultaneously generating both intense femtosecond UV (308-, 248.5-nm) excitation pulses and femtosecond continua for probing photoexcited molecules via broadband absorption spectroscopy. The excitation pulses are obtained by amplification of femtosecond pulses in XeCl and KrF excimer gain modules. The probe pulses rely on continuum generation in the gas phase. Currently, three spectral regions can conveniently be probed with our apparatus. These occur in the UV (230–450 nm), visible (400–800 nm), and IR (2.2–2.7 μm).
© 1989 Optical Society of America
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