Contribution of backscattered electrons to the total electron yield produced in collisions of 8-28 keV electrons with tungsten

Yadav, R. K.; Shanker, R.
March 2007
Pramana: Journal of Physics;Mar2007, Vol. 68 Issue 3, p507
Academic Journal
It is shown experimentally that under energetic electron bombardment the backscattered electrons from solid targets contribute significantly (∼80%) to the observed total electron yield, even for targets of high backscattering coefficients. It is further found that for tungsten (Z = 74) with a backscattering coefficient of about 0.50, about 20% of the total electron yield is contributed by the total secondary electrons for impact energies in the range of 8-28 keV. The yield of true backscattered electrons at normal incidence (η0), total secondary electrons (δ) and the total electron yield (δtot) produced in collisions of 8-28 keV electrons with W have been measured and compared with predictions of available theories. The present results indicate that the constant-loss of primary electrons in the target plays a significant role in producing the secondary electrons and that it yields a better fit to the experiment compared to the power-law.


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