Abstract
In this paper, results are presented on the emission of secondary electrons from various surfaces under collisional excitation by incident energetic multiply-charged macro-molecular ions from an electrospray source. The impact velocities fall in the range v = 30 to 90 km/s, above the threshold for kinetic electron emission. The secondary electron yield varies dramatically for different targets. The yield is proportional to ( v 2 − a), where a is a constant which depends on projectile mass and charge state and on the target material. For graphite, the secondary electron yield is proportional to mass, whereas for Al 2O 3 it is proportional to M 0.74. A simple model is proposed to explain an observed modulation of the electron yield with primary ion charge state and conformation.
Published Version
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