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We present extended x-ray absorption fine structure EXAFS data at the La L2 edge in LaOCl that were recorded on the L1 fluorescence line with an analyzer energy bandwidth of 1.3 eV. We show that by taking advantage of the high-energy-resolution fluorescence detection HERFD it is possible to extend the energy range for L2 EXAFS analysis beyond the L1 edge if the sample is optically thin. The arguments presented here generally apply to fluorescence-detected absorption spectroscopy if the fluorescence lines are sufficiently separated in energy. Calculations using an atomic multiplet model show that intensity due to 2p4d multiple- electron excitations is reduced in HERFD spectra. The technique has the potential of considerably improving EXAFS analyses at low energies 10 keV when absorption edges lie within a few hundred electron volts.

physical review. b, condensed matter and materials physics

Range-extended EXAFS at the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>L</mml:mi></mml:math>edge of rare earths using high-energy-resolution fluorescence detection: A study of La in LaOCl

Range-extended EXAFS at theLedge of rare earths using high-energy-resolution fluorescence detection: A study of La in LaOCl