2 TIME-DEPENDENT, FOCUS-DEPENDENT EXPERIMENTS USING THE ENERGY-DISPERSIVE SPECTROMETER AT LURE

Rather than a brief review of what has been achieved at LURE [A. Fontaine, E. Dartyge, J. P. Itie, A. Polian, H. Tolentino, and G. Tourillon, Topics in Current Chemistry 151, (Springer, Berlin, 1989), Vol. 151] since 1985 with the fully dedicated, energy dispersive x-ray absorption fine structure beam line, we will present two classes of experiments plus a discussion on the present ultimate source of noise of our mechanical movement-free spectrometer. Moreover, the readers interested in this field, can find two other studies with the new born ports at Hamburg [M. Hagelstein, S. Cunis, R. Frahm, W. Niemann, and P. Rabe, Phys. B 158, 324 (1989)] and Daresbury [G. Baker, C. Richard, A. Catlow, J. Couves, A. J. Dent, G. Derbyshire, G. N. Greaves, and J. M. Thomas, XAFS VI York 1990]. Related to this field are the quick extended x-ray absorption fine structure spectrometers developed initially at Hamburg under R. Frahm [R. Frahm, Nucl. Instrum. Methods A 270, 578 (1988)] and at LURE under P. Lagarde and C. Prietto [P. Lagarde, M. Lemonnier, and H. Dexpert, Physica B 158, 337 (1989)], which have been able in these two years to open new routes in a wide variety of science.