High resolution measurement of Kbeta1,3 emission line in Cr metal and Cr compounds

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

Campinas

Congreso; XV Reunión Anual de Usuarios del LNLS; 2005

LNLS

The CrKb1,3 line originates in the 3p ! 1s transition. Thistransition generates the 3p−1 state, whose unpaired electron isstrongly coupled with the unpaired electrons in the partiallyfilled 3d shell, giving origin to multiplets. According to thedipolar transition rule, the final states will have 5P or 7P symmetry,depending on the two possible orientations of the unpairedelectron spin in the 3p−1 state, with respect to that ofthe 3d electrons. If the spins are parallel it will have the term7P (Kb1,3 line), of higher energy; while if the spins are antiparallelit will have 5P term, giving origin to the Kb0 satelliteline.For d0 compounds, such as CrVI compounds, no splitting ofthe K spectrum is predicted by the simple model of 3p3d exchangecoupling. A way of introducing the covalent characterto this model would be to consider interactions between theground configuration and the configuration derived from theligand electron excited to the d−orbital of the metal [1]. Thisway, Kb fluorescence processes could be described by using aligand field atomic multiplet model that takes into account intermediatestates involving the ligand atoms [2]. In this work,the Kb emission spectra of chromium in compounds with differentoxidation states are analyzed to characterize the dependenceof the line energy and line width with the oxidation state.