Аннотация:Abstract
Anisotropy of dependence of secondary electron emission coefficient σ from the angle α of primary electron incidence onto single crystals of metals with a different crystalline lattice (Cu, Mo, Zn and Ni4Mo) has been studied for an undisturbed surface and for a surface. It was shown that the yield of secondary electrons is smaller for the disturbed surface, than for initial one due to electron absorption by the side surfaces of hills and cones which are formed as a result of sputtering. On the σ (α) dependencies for Cu, Mo and Ni4Mo the maxima in the low-index directions of crystal lattice arise as a result of primary and secondary electron scattering on the atoms in open channels. At the same time, for the oxidized Zn single crystal surface the minimum of σ in the direction of open channel was observed. It is explained with reduction of work function of surface atoms, increase in penetration depth of electrons in an open channel and rise an electron-phonon interaction that leads to decrease of secondary electron emission. Angular dependences of secondary electron emission for a surface after ion irradiation have more complicated structure – with the additional maxima and minima caused by interaction of secondary and scattered electrons with a cone-shaped relief.