Localization of electron current density and its effect on damage production in a molybdenum crystal

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Abstract
Three-dimensional, fine distributions of electron current density in a molybdenum crystal are examined by the many-beam dynamical theory of electron diffraction for electrons incident parallel to the principal zone axes. It is found that the two-dimensional distribution in the transverse plane oscillates along the depth direction, and that a highly localized distribution around the rows of atoms and an almost flat distribution appears alternatively with definite periods of depth. The effect of the localized current density on the damage production is discussed by introducing the “effective current ratio”, J eff which is defined as the ratio of the local current density at the rows of atoms to the mean current density for electrons incident parallel to the zone axis. The values J eff for the incidence of 1 MeV electron are found to increase in the order of the (111), (001) and (110) directions. The energy dependence J eff is also examined for the (001), (110) and (111) axial cases respectively.