Important scientists and inventors - topics of interest beginning with X

These are lists of the topics covered in the lists of scientists and inventors, with some cross-referencing.

 X-ray  Muller, Perrin, Röntgen

 X-ray crystallography

 Deisenhofer, Hauptmann, Huber, Karle, von Laue, Michel

 X-ray diffraction

 Debye, Franklin, Wilkins

 X- ray photoelectron spectroscopy  Siegbahn
 X-ray spectroscopy  Barkla, Siegbahn