A High Efficiency Electron Energy Analyzer for Multiphoton Photoemission Spectroscopy.

We report the use of a new, extremely efficient electron energy analyzer for recording high resolution electron spectra from multiphoton photoemission. The analyzer uses an electrostatic parabolic mirror and has a collection solid angle in excess of 2pi sr with an energy resolution of 35 meV at 1.8 eV. We have used this detector to record the above threshold ionization spectra emitted in xenon using a 275 fsec, 616 nm, 2x10 sup 14 W/cm sup 2 laser pulse.