1. The problem statement, all variables and given/known data Given: Diamond structure with conventional lattice parameter a. Show the Fourier component of the crystal potential at the reciprocal lattice point (4(pi)/a, 0, 0) is zero. 2. Relevant equations (I don't know!) 3. The attempt at a solution The Fourier component of potential = U_G1, U_-G1 (although I have no idea what G1 is.... this was pulled from my notes) G = (2hpi/a) where h is an integer G = (2pi/a)(h, k, l) where h,k,l must either all be odd or all be even This is as far as I got... any suggestions? Thanks! If it helps, I have been given the solution but I don't understand it, which is why I'm asking here. The solution mentions using the structure function (what is it?) and allowing Bragg reflection (but I don't know how to incorporate it).