An Experimental Study on the Anomalous Transmission of Electrons through Crystals. Measurements with Molybdenite Films at 200 and 500 kV

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Abstract
Transmitted intensities of electrons I B and I N were measured at exact Bragg position and at non-Bragg position, respectively. The ratio I B /I N increased with the thickness at first, had a maximum value (about four) and then decreased with the thickness and approached unity. No anomalous transmission effect was observed for molybdenite films thicker than about 3 µm at 200 kV and 5 µm at 500 kV. This is against the two-beam dynamical theory, where the ratio increases with thicknesses monotonically. The experimental result was analyzed taking into consideration the contribution of electrons which shows no diffraction contrast.

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