An investigation of the range or absorption characteristics of secondary electrons in magnesium by means of examining (with high energy primary electrons) the secondary electron emission ratio $\delta$ as a function of the thickness $x_1$ of magnesium layers evaporated on a carbon backing has led to an expression $l_{1s}=l_{01s}{E}^2$ for the ranges of secondary electrons as a function of the energy $E$ of the secondary electrons at the point of production in the solid. An analysis of the results yields relations between $\delta$ and $x_1$ (for the primary energies used) as well as the separate contributions of backing and layer to the total secondary emission. Values of $l_{01s}$ obtained from this experiment on magnesium for two, four, six, and eight kilovolts are 1.3, 1.7, 2.2, 2.3×${10}^{-9\mathrm{}}$ cm/${\mathrm{}\left(\mathrm{volt}\right)\mathrm{}}^2$, respectively. The depth of origin of secondary electrons in the energy range from 10 volts to 200 volts will vary from 2×${10}^{-7\mathrm{}}$ cm to 4×${10}^{-5\mathrm{}}$ cm.

Close

PrevNext

View figure in article