COMMENTS ON THE USE OF ASYMMETRIC MONOCHROMATORS FOR X-RAY-DIFFRACTION ON A SYNCHROTRON SOURCE - COMMENT

In the article ''Comments on the use of asymmetric monochromators for x-ray diffraction on a synchrotron source,'' by Colin Nave, Ana Gonzal ez, Graham Clark, Sean McSweeney, Stewart Cummings, and Michael Hart, Rev. Sci. Instrum. 66, 2174 (1995), paragraph II, the authors' unfamil iarity with our modeling codes leads them to claim that our approach t o treat bent-asymmetrically cut crystals in ray tracing calculations i s incorrect. Since SHADOW is a widely used code, it is important to co rrect any misunderstandings, and we give here arguments to demonstrate that our approach is perfectly valid, and the arguments used by the a uthors to criticize our method are based on an unwarranted conclusion extracted from one of our previous articles. We show that SHADOW, when properly run, treats the cases raised exactly. Indeed, their argument s provide a nice benchmark test for verifying the accuracy of SHADOW ( C) 1996 American Institute of Physics.