Browsing by Subject "Multiplet splitting"

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    XPS characterization of Bi and Mn collected on atom-trapping silica for AAS
    (Sage Publications, Inc., 1999) Süzer, Şefik; Ertas, N.; Ataman, O. Y.
    The chemical state of analyte species collected on a water-cooled silica tube during atom-trapping atomic absorption spectrometric determination is investigated with the use of X-ray photoelectron spectroscopy (XPS) for Bi and Mn. Analysis of the Bi 4f7/2 peak reveals that the chemical state of Bi is +3 during initial trapping (before the atomization stage), but an additional 0-valence state of Bi is also observed after the atomization stage. With the use of the measured Mn 2p3/2 binding energy together with the observed 3s multiplet splitting, the chemical state of Mn is determined as +2 in all stages. Together with our previous determination of 0 valence for Au, it is now postulated that the stability of certain valence states of the three elements (Au, Bi, and Mn) on the silica matrix can be correlated to their electrochemical reduction potentials.
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    XPS characterization of Co and Cr pigmented copper solar collectors
    (Elsevier, 1999-01-01) Süzer, S.; Kadirgan, F.; Söhmen, H. M.
    XPS is used to characterize the chemical state of Co and Cr on the surfaces of electrochemically pigmented copper plates. Using both the measured 2p binding energies and the magnitude of the 3s multiplet splitting chemical states of 2# and 3# are assigned to Co and Cr, respectively. FTIR reflectance analyses reveal that the surfaces of the pigmented samples contain hydrogen bonded OH groups. Optimum solar absorbance and thermal emittance values obtained are a"0.92 and e"0.17, a"0.96 and e"0.04 for the Co and Cr pigmented copper collectors, respectively. ( 1999 Elsevier Science B.V. All rights reserved.