Question

HW4.12. Primary Electron Range in Auger The range of primary electrons, the incident electrons responsible for ejecting a core electron, is described by the equation r = 27.6AE, 1.6 PZ0.89 nm. A is average atomic weight (in amu), r is electron range (in nm), E, is the energy of the primary electron beam (in keV), p is specimen density (g/cm3), and Z is the average atomic number. What is the minimum primary electron energy required to penetrate 10 nm into the surface of a silicon specimen? A, p, and Z for silicon are respectively 28.09 amu, 2.328 g/cm3, and 14. Consider the usual range of electron beam energies used for Auger spectroscopy, and think about why the energy you calculated might be different. energy (keV) 1 x0% Try question again Correct answer The correct answer is 0.5002042404802635 keV.

Answer 1

given ra lonm 28.09 Amo 2.328 g/cm3 2 = 14 we know 27.6A E !.67 (20.89 to a prezent 27.6 A 67 to = (2.328) (1990.89 r (10) €2.328) (14jo.8 27.6 (28.09) Eo = 0.500g ou keu