Dependence with the oxidation state of x-ray transition energies, intensities and natural line widths of Cr-Kb spectra

M TORRES DELUIGI; TIRAO, G.; G. STUTZ; C. CUSATIS; J.A. RIVEROS

CHEMICAL PHYSICS

Elsevier Science B.V.

Lugar: HOLANDA; Año: 2006 vol. 325 p. 477 - 484

0301-0104

The Kb emission spectrum of chromium was experimentally analyzed in different compounds and compared with previous data. Measurements of whole Kb spectra were performed with a wavelength dispersive commercial XRF equipment. To study possible effects of thechemical state in the width and position of the main Kb1,3 line, high resolution measurements were also performed. In the latter measurements, a spectrometer based on a backdiffracting crystal analyzer with spherical focalization and synchrotron radiation monochromaticexcitation was used. Kb1,3 line shifts in relation to metallic Cr were observed, both to higher energies (ffi+1 eV) for CrIII and to lower energies (ffi0.5 eV) for CrVI. It was also found that the natural width of CrKb1,3 line, the ionization energy of the 3p orbital of Cr, and the relative intensities of Kb00 and Kb2,5 lines with respect to the main Kb1,3 line increase as the oxidation state increases. The use of these features as an index for chemical state analysis is discussed.