EXAFS and Near Edge Structure IV

J. Phys. Colloques 47 (1986) C8-189-C8-192
DOI: 10.1051/jphyscol:1986835

EXAFS MEASUREMENT UNDER HIGH PRESSURE BY DIAMOND ANVIL CELL

K. OHSUMI¹, S. SUENO², I. NAKAI³, M. IMAFUKU³, H. MORIKAWA⁴, M. KIMATA², M. NOMURA¹ et O. SHIMOMURA<sup>5

1</sup>  Photon Factory, National Laboratory for High Energy Physics (KEK), Oho-machi, Tsukuba-gun, Ibaraki 305, Japan
²  Institut of Geoscience, University of Tsukuba, Japan
³  Department of Chemistry, University of Tsukuba , Japan
⁴  Research Laboratory of Engineering Materials, Tokyo Institut Technology, Japan
⁵  National Institut for Research in Inorganic Materials

Abstract
EXAFS spectra of materials under high pressure were successfully obtained for K-absorption edges of Fe, Co and Ni atoms by making use of synchrotron radiation together with the diamond anvil cell technique. A newly developed goniometer stage with a remote controlled motor was found to be useful for adjusting the position of a miniature diamond anvil cell for an X-ray beam. The present study revealed that an experimental system consisting of a Si(111) monochromator, a scintillation counter and a pair of normal 1/8 carats diamond anvils worked well for the measurement of Fe, Co and Ni atoms. For further measurement of absorption spectra of atoms with lower atomic number than Fe, a specially designed thinner diamond anvil or higher brightness synchrotron radiation source would be required.