My Ph.D. supervisor, Prof. K. H. Jack, FRS, told me, many years ago, about a technique that he called pencilling, which was used in the Cavendish Laboratory in the 1940s to increase the beam intensity from plane monochromators. The technique was apparently devised by Prof. Sir Peter Hirsch, FRS, then one of his fellow Ph.D. students, and is very simple: take the blunt end of a pencil, and rub the surface of the monochromator with it in order to slightly disrupt the crystal lattice and increase the amount of mosaic structure.
See also: Kinematic and Dynamic Diffraction.
No comments:
Post a Comment