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We demonstrate a new technique in velocity map imaging (VMI) that allowsspatial gating of the laser focal overlap region in time resolved pump-probeexperiments. This significantly enhances signal-to-noise ratio by eliminatingbackground signal arising outside the region of spatial overlap of pump andprobe beams. This enhancement is achieved by tilting the laser beams withrespect to the surface of the VMI electrodes which creates a gradient in flighttime for particles born at different points along the beam. By suitably pulsingour microchannel plate detector, we can select particles born only where thelaser beams overlap. This spatial gating in velocity map imaging can benefitnearly all photoion pump-probe VMI experiments especially whenextreme-ultraviolet (XUV) light or X-rays are involved which produce largebackground signals on their own.

Focal overlap gating in velocity map imaging to achieve high signal-to-noise ratio in photo-ion pump-probe experiments