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A terawatt tabletop laser wakefield acceleration source of relativisticelectrons has been developed in our Terawatt Ultrafast High Field Facility(TUHFF). The preliminary results for ultrafast radiolysis of liquid water usingthis femtosecond electron source are presented. A TUHFF based femtosecond x-raysource is proposed. Thomson scattering of the accelerated electrons off acounterpropagating terawatt laser beam will be used to generate keV x-rayphotons. The expected parameters of this x-ray source have been estimated. Theshort pulse duration, high flux, and good collimation of the resulting x-raybeam would be conducive for ultrafast time-resolved x-ray absorption studies ofshort-lived transient species in gases, liquids, and solids. It is argued thatthe solvation dynamics of Br atoms generated in photoinduced electrondetachment from aqueous bromide would make a convenient choice for the firstpump-probe experiment using this x-ray source.

Femtosecond electron and x-ray source based on laser wakefield accelerator