Laboratory EXAFS spectrometer for catalyst studies

Abstract

A laboratory x-ray absorption spectrometer is described which allows very high quality x-ray absorption edge and extended x-ray absorption fine structure (EXAFS) data to be obtained. The spectrometer utilizes a channel-cut crystal configuration monochromator for absorption edge studies and a fully focusing Johansson cut bent crystal monchromator operated on the Rowland circle for high flux, high resolution EXAFS studies. X-ray generation is by a rotating anode generator. Photon fluxes are about 104 higher than for a sealed-tube flat-crystal spectrometer; it is shown that data of quality comparable to that obtained from a synchrotron source (SSRL) can be obtained in comparable time.