text: George Sheldrick created the ShelX programs for use in this technique; those programs include algorithms for direct methods and charge flipping.
full_question: George Sheldrick created the ShelX programs for use in this technique; those programs include algorithms for direct methods and charge flipping. Analysis of structure factors can predict the systematic absences in this technique that result from geometries containing screw axes or glide planes. Peaks in this technique correspond to planes defined by the vectors h, k and l. Common sources of radiation for this technique include K-alpha emissions from copper or molybdenum tubes. This technique works because the incident radiation has wavelengths similar to atomic spacings, which serve as a grating. This technique, whose peaks must satisfy Bragg’s law, was used by Rosalind Franklin to deduce the structure of DNA. For 10 points, name this technique which uses electrons, neutrons, or high energy radiation to study the structure of solids.
first_sentence: George Sheldrick created the ShelX programs for use in this technique; those programs include algorithms for direct methods and charge flipping.