> But I am not sure about the gamma rays you talk about, it may be > able to > produce them, but I believe most of the work is done using short UV > radiation for examining molecular structures (which is why Welcome > Trust are > in the picture). PC just threw away a long response. Will teach me to save as I go, as I tell everyone they ought to do, and as I usually do. SO Read / skim this interesting document and report back on what you think about the world's "light sources", including "Diamond", which at 3 GeV ring energy and 100 keV plus "light" energy is 'right up there'. Extremely good introduction / overview to the development and current state of the art for generation of gamma rays, xrays and other types of very short wavelength light. http://www.business.ualberta.ca/tcc/documents/Synchrotron_Technology_Paper_FINAL.pdf Russell -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist