Hi there, My textbook says "When a beam of high energy electrons is directed at a thin solid sample of an element, the incident electrons are diffracted by the nuclei of the atoms in the foil." What does this mean exactly? Are the atoms diffracted by the gap between different nuclei? It goes on to say they are diffracted because the de broglie wavelength of the electrons is similar to the diameter of the nuclei - but I thought the wavelength had to be similar to the gap width, i.e the distance between two nuclei. This gap width wouldn't necessary by the same as the diameter of the nucleus would it? Thanks in advance!