Abstract
We have examined the feasibility of performing crossed molecular beam chemistry with pulsed beams ablated from surfaces. Crossed ablated beams (CAB) could be formed by laser photodissociation, photoejection or thermal desorption involving either adsorbate molecules or substrate. We note that: (i) reagents can be formed in high flux pulses with temporal widths as short as the laser duration, (ii) reaction product signal levels are several orders of magnitude higher than for conventional crossed molecular beam experiments, (iii) the short duration of the beam crossing allows the product time-of-flight spectra to display excellent translational energy resolution, (iv) the method lends itself to the generation of free radical beams, permitting radical-radical reactions to be studied under single collision conditions, (v) reactions with cross-sections as low as 0.01 Å2 should be readily observable. Other attributes of CAB include aligned reagents or beams of complexes.
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