Interaction of Slow Electrons with Insulating Crystals. I. Absorption Coefficient for Cleaved Alkali Halides; Experimental Techniques

Autor:	William J. Fredericks, Charles J. Cook
Rok vydání:	1961
Předmět:	Chemistry Attenuation coefficient Analytical chemistry Impact energy General Physics and Astronomy Halide Electron trapping Charge (physics) Electron Alkali metal Molecular physics
Zdroj:	Journal of Applied Physics. 32:860-866
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.1736119
Popis:	Techniques have been developed that will permit a unique determination of an absorption coefficient δa for 0.2‐ to 20‐ev electrons on cleaved, insulating crystals. Two classes of electron trapping levels, one that empties rapidly and one that does not empty at room temperature, may exist in the target and if they do, effects caused by them may perturb the data. Experimental techniques were developed to compensate for each characteristic effect. Pure and nonstoichiometric KBr and KCl crystals were studied. The probability that a crystal‐incident electron results in a charge influx was found to vary makedly as a function of the impact energy and in a manner characteristic of the target. This feasibility study indicates that slow electron beams could be a powerful tool for diagnosing surface and bulk properties of insulating crystals.
Databáze:	OpenAIRE
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