INVESTIGADORES
SANCHEZ Hector Jorge
congresos y reuniones científicas
Título:
Theoretical Comparison of the Resonant Raman Scattering contributions to the Background of XRF Spectra
Autor/es:
H. J. SÁNCHEZ; M.C. VALENTINUZZI; J. J. LEANI
Lugar:
Puebla
Reunión:
Congreso; SARX 2010; 2010
Resumen:
X-ray
fluorescence spectra present singular characteristics produced by the different
scattering processes. When atoms are irradiated with incident energy lower and
close to an absorption edge, scattering peaks appear due to an inelastic
process known as resonant Raman scattering. In this work we present theoretical
calculations of the resonant Raman scattering contributions to the background
of X-ray fluorescence spectra. In order to perform the calculations the
Shiraiwa and Fujino's model was used to calculate characteristic intensities
and scattering interactions. This model makes certain assumptions and
approximations to achieve the calculations, especially in the case of the
geometrical conditions and the incident and take-off beams. The calculations
show that the Raman scattering background is significant under the fluorescent
peak, affects the symmetry of the peaks and, depending on the concentrations,
overcomes the enhancements contributions (secondary fluorescence).
The
model proposed here allows analyzing the different sources of background, which
contribute to a better understanding of the physical processes involved in the
different techniques of XRF analysis.