J. Phys. IV France 7 (1997) C2-647-C2-648
EXAFS Study of the Hydration Structure of Ga Aqueous Solution. Comparison of Data from two LaboratoriesA. Muñoz-Páez1, S. Díaz-Moreno1, E. Sánchez Marcos2, J. M. Martínez2, R. R. Pappalardo2, I. Persson3, M. Sandstrom4, S. Pattanaik4 and P. Lindquist-Reis4
1 Departmento de Química Inorgánica and ICMSE, University of Sevilla - CSIC, 41012 Sevilla, Spain
2 Departamento de Química Física, Universidad de Sevilla, 41012 Sevilla, Spain
3 Department of Chemistry SLU, Box 7015, 75007 Uppsala, Sweden
4 Department of Chemisty, The Royal Institute of Technology, 10044 Stockholm, Sweden
The reliability of EXAFS data is a matter of controversy when new applications near the limit of the technique are carried out. Herewith we present results of aqueous solutions of Ga(N03)3 (0.005-1.0M) and Ga(C104)3 (0.5M) measured at two synchrotron sources, SRS (Daresbury, UK) and SSRL (Stanford, USA), respectively, by two independent teams (Sevilla, Spain and Uppsala-Stockholm, Sweden), and analyzed with two different software packages (XDAP and EXAFSPAK). For the first hydration sphere the fitting parameters obtained are the same (d(Ga-OI)=1.95±0.005Å, CN=6.0±0.1). Parameters apparently corresponding to a second hydration sphere (d(Ga-OII)=3.97±0.03Å, CN=12±2) can be refined from both sets of spectra if the XDAP package is used, but no such contribution can be found with the EXAFSPAK program package. This is a consequence of different spline fitting techniques used in the two program packages.
© EDP Sciences 1997