The electrostatic potential field has been calculated numerically near the ends of the electrostatic cylindrical mirror analyzer. The effects of various guard ring configurations on the field distortion are calculated. The trajectories of electrons passing through the guarded and unguarded fields are calculated, and it is shown how field distortions influence the focusing properties of the analyzer. A coincidence spectrometer is proposed, based on the action of guard rings upon the fringing field.
Potassium chloride single crystals are irradiated with a 3 ke V electron beam, and the optically stimulated exoelectron spectra (OSEE) are studied as a function of dose, temperature, and energy in the range from 300 to 650 nm. Optical extinction spectra are measured simultaneously with the OSEE spectra. The exoemission spectra seem to show exoemission peaks corresponding to the F and K optical absorption bands. In addition an emission peak appears at about 400 nm within the high‐energy tail of the K‐band. Emission lineshapes are narrower than extinction lines and peak positions do not exactly correspond. With increasing surface damage the F‐band emission diminishes. Increasing temperature produces a shift in the F‐band to longer wavelengths and an increase in intensity.
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