Synchrotron Radiation X-Ray Fluorescence at the LNLS: Beamline Instrumentation and Experiments

C. A. PÉREZ; M. RADKE; H. J. SÁNCHEZ; H. TOLENTINO

X-RAY SPECTROMETRY

JOHN WILEY & SONS LTD

Año: 1999 vol. 28 p. 320 - 326

0049-8246

The x-ray fluorescence beamline of the Laboratorio Nacional de Luz S´ıncrotron (LNLS) is described.The main optical component of the beamline is a silicon (111) channel-cut monochromator, which cantune energies between 3 and 14 keV. A general description of two experimental stations is given. Beamcharacterization was done by measuring experimental parameters such as vertical profile and monochromaticflux. These results show that the photon flux at 8 keV in an area of 20 mm2 is 4:2  109 photons s−1. Thepossibility of achieving fine tuning of energies (high resolution) was confirmed. This paper presents someoriginal results derived from the commissioning of the beamline, such as a comparison of detection limitsin different experimental conditions, and a novel mechanical system to align capillaries together with asemi-automatic adjustment procedure. So far, there have been several proposals to perform a variety ofexperiments at this beamline, covering different fields, such as physics, chemistry, geology and biology.Copyright Ó 1999 John Wiley & Sons, Ltd.