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We report the demonstration of a high repetition rate desktop-size capillary discharge laser emitting at (= 46.9 nm (26.5 eV) used for experiments in photochemistry. Laser pulses with energy ~ 13 uJ were generated at 12 Hz repetition rate by single pass amplification in a 21 cm long Ne-like Ar capillary discharge plasma column. The capillary lifetime is 2-3 104 shots. This new type of portable laser is of interest for numerous applications requiring a compact intense source of short wavelength laser light. One such application that we are currently pursuing is the study of small molecules using time of flight mass spectroscopy. Molecules include ammonia, NO, oxygen, hydrogen bonded nanoclusters, and metal oxide nanoclusters. Through single photon ionization the reactivity and catalytic behavior of these molecules is studied.

Desk-top size high repetition rate 46.9 nm capillary discharge laser as photoionization source for photochemistry applications