Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, Vol. 293, No. 1433 (Jul. 26, 1966), pp. 169-180 (16 pages) The selected area electron diffraction patterns ...
A laser beam is shone onto a variable rectangular aperture. The size of the hole determines the type of diffraction produces on the screen. Very small apertures produce Fraunhofer diffraction, and ...