J. Phys. IV France 7 (1997) C2-549-C2-552
XANES Registration by Electron Beam Position Scanning for Time-Resolved ExperimentS.G. Nikitenko1, B.P. Tolochko2, A.N. Aleshaev3, G.N. Kulipanov3 and S.I. Mishnev3
1 Siberian SR Centre (SSRC) of Budker Institute of Nuclear Physics, Institute of Catalysis, Novosibirsk 630090, Russia
2 Siberian SR Centre (SSRC) of Budker Institute of Nuclear Physics, Institute of Solid State Chemistry, Novosibirsk 630128, Russia
3 Budker Institute of Nuclear Physics, Novosibirsk 630090, Russia
A new method of XANES registration has been designed and realised at VEPP-3. Traditionally, the monochromator rotation is used for the energy scanning. In this new method, the position of the monochromator is fixed, but the position of the electron beam is changed by the magnetic field. As a result, the angle SRbeam/ monochromator is changed thus changing the energy of the monochromatic beam. We registered test-XANES spectra of Ag by electron beam position scanning and then used this method to investigate fast Ag reduction from organometallic compounds. Depending on the type of monochromator and on the energy interval, XAFS spectra may be measured now within 6-20 s. Traditional QEXAFS has a natural limit, depending on 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 limit for fast scanning. The use of an undulator as synchrotron radiation source can improve the time resolution of this method by several orders of magnitude and reach nanosecond region.
© EDP Sciences 1997