Chemical environment determination using resonant Raman scattering spectroscopy

J. J. LEANI; HECTOR JORGE SANCHEZ; M.C. VALENTINUZZI; C. A. PÉREZ

Activity Report LNLS

LNLS, Brasil

Año: 2010 p. 1 - 2

1518-0204

X ray fluorescence spectra present singular characteristicsproduced by the different scattering processes. When atomsare irradiated with incident energy lower and close to an absorptionedge, scattering peaks appear due to an inelastic processknown as resonant Raman scattering (RRS) [1]. In thisprocess, the emitted photons have a continuous energy distributionwith a high energy cut-off limit. When the energyof the incident photon approaches from below to the absorptionedge of the target element, a strong resonant behaviortakes place contributing to the attenuation of x-rays in matter.According to the absorption-emission model the RRS processcan be represented by three steps [2]: 1) the initial state consistsof an incident photon with an energy below, for example,the K threshold 2) a hole is produced in the K shell and theexcited electron is ejected to an unoccupied state; an electronfrom a higher shell fills the vacancy and a photon is emitted 3)the final state consists of a hole in a higher shell, a scatteredphoton and an excited electron in the continuum or in a boundexcited state.