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Chemical dependence of second-order radiative contributions in the Kbeta x-ray spectra of vanadium and its compounds

Kbeta x-ray spectra of metallic vanadium and its compounds (V_2O_3, V_O_2, V_2O_5, VC, VN, VCl_2, NH_4VO_3, and VOSO_4×5H_2O) induced in thick targets by 3 MeV proton beams were measured by using wavelength dispersive (WD) x-ray spectrometer. In addition to the main Kbeta_1, 3 x-ray line, "satellites" or second order contributions like Kbeta', Kbeta'', Kbeta''', and Kbeta_2, 5 were clearly resolved. Intensities and positions of these lines relative to the Kbeta_1, 3 x-ray line have been extracted by fitting the spectra and corrected for x-ray sample self-absorption. The influence of the oxidation states and vanadium-ligand bond distances in studied compounds on relative intensities and positions of Kbeta'', Kbeta_2, 5, and (Kbeta''+Kbeta_2, 5) x-ray lines (relative to Kbeta1, 3+Kbeta') has been studied and discussed. The obtained results indicate that the strength of the Kbeta'' and Kbeta_2, 5 transition probability per vanadium-ligand pair decreases exponentially with increasing vanadium-ligand distance, in agreement with the observation reported by Bergman et al. for K relative intensity in a number of Mn oxide compounds [U. Bergmann, C. R. Horne, T. J. Collins, J. M. Workman, and S. P. Cramer, Chem. Phys. Letters 302, 119 (1999)].

Kbeta x-ray spectra; vanadium

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