A pulsed electron source for atomic collision experiments

Details A pulsed electron source for atomic collision experiments A pulsed electron source for atomic collision experiments

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..570..996s&link_type=abstract

The fourteenth international spin physics symposium, SPIN2000. AIP Conference Proceedings, Volume 570, pp. 996-999 (2001).

Physics

Atomic And Molecular Beam Sources And Techniques, Electron And Positron Beams, Electron Sources, Polarized Beams

Scientific paper

A pulsed photoelectron gun has been constructed to satisfy the beam specifications required by ``reaction microscope'' studies of atomic collisions [1,3]. Short pulses of electrons (<500 ps) are produced using GaAs/AlGaAs heterostructure crystals. The laser diode for the gun operates at 650 nm and can generate up to 60 μA average current. Quantum efficiencies of 3% and a photocathode lifetime of one week have been achieved. To study the emission characteristics of the photoelectrons a novel imaging spectrometer has been constructed and first energy-distribution curves have been measured at moderate resolution. Computer simulations show, that an excellent energy (<1 meV) and angular resolution is attainable with such a spectrometer. .

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