The Energy Loss of Electrons Passing through Thin Crystals. I

The energy loss spectra of electrons at the accelerating voltage 100∼500 kV are measured. The most probable energy loss depends on the orientation of the crystal to the incident beam. The most probable energy loss at the Bragg reflecting position is less than that at other diffraction conditions. The energy loss in thin crystal about 5 µm thick is less than that expected by the Landau theory (J. Phys. USSR 8 (1944) 201).