XANES REGISTRATION BY ELECTRON BEAM POSITION SCANNING FOR TIME-RESOLVED EXPERIMENT. Sergei G. Nikitenko, ^*Boris P. Tolochko, ^**Alexander N.Aleshaev, ^**Gennady N.Kulipanov, ^**Svyatoslav I. Mishnev. Institute of Catalysis, Novosibirsk-90, Russia; ^*Institute of Solid State Chemistry, Novosibirsk-128, Russia; ^**Institute of Nuclear Physics, Novosibirsk-90, Russia

We have designed and realized at VEPP-3 new method for XANES registration. Traditionally, the monochromator rotation is used for the energy scanning. In new method the position of the monochromator is fix, but the position of the electron beam change by magnetic field. As a result the angle SR-beam/monochromator change and change the energy of the monochromatic beam.

We received test-XANES spectra of Ag by electron beam position scanning and then use this method for investigation of the fast Ag reduction from metal-organic compounds.

Depending on the type of the monochromator used and energy interval scanned, XAFS spectra may now be measured in a matter of 6-20 s. Traditional QXAFS has natural limit, which depend from the mass of the crystal of the monochromator, holder and translation stage. The mass of the electrons in the bunch is very small and there is no limits for fast scanning.

The using ondulator as a SR source in this method can improve the time resolution of this method in several odes.