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Measurement of autoionization rates for electron emission above a metal surface.

We present K Auger spectra arising from collisions of N6+ ions with a Ni(110) target for different kinetic energies and observation angles. The bulk of the electrons is ascribed to emission below the surface. At very low collision velocities (v(perpendicular-to) less-than-or-equal-to 10(-2) a.u.) we find a pronounced contribution from electrons emitted prior to impact. The velocity dependence of the above-surface component is used for the experimental determination of the time scales involved in electron emission above the surface. Comparison with theoretical estimates is also presented.