<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2008000700008</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Ligand field and interference effects in L-edge x-ray Raman scattering of MnF2 and CoF2]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiménez-Mier]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Herrera-Pérez]]></surname>
<given-names><![CDATA[G.M]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Olalde-Velasco]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ederer]]></surname>
<given-names><![CDATA[D.L]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Schuler]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Ciencias Nucleares ]]></institution>
<addr-line><![CDATA[México DF]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Tulane University Department of Physics ]]></institution>
<addr-line><![CDATA[New Orleans LA]]></addr-line>
<country>U.S.A.</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2008</year>
</pub-date>
<volume>54</volume>
<fpage>30</fpage>
<lpage>35</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2008000700008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2008000700008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2008000700008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[We present experimental results for x-ray absorption and resonant emission at the L-edge of the transition metal in MnF2 and CoF2. The emission data are corrected for self-absorption. The data are compared with calculations in both the free-ion approximation and with the effect of the ligand field of D4h symmetry included. The results of the calculations take into account interference terms in the Kramers-Heisenberg expression. We obtain very good agreement between experiment and theory for both x-ray absorption and resonant emission in the two compounds. The inclusion of the ligand field is important to achieve such agreement. However, the results of the calculation that does not take into account the interference terms are in better agreement with experiment, indicating that the model used probably overestimates the importance of interference effects.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Presentamos resultados experimentales para absorción y emisión resonante de rayos x en la orilla L del metal de transición en MnF2 y CoF2. Los datos de emisión se presentan corregidos por autoabsorción. Los datos se comparan con cálculos en la aproximación de ion libre y con el efecto de un campo ligante de simetría D4h incluido. Los resultados del calculo toman en cuenta los términos de interferencia en la expresión de Kramers-Heisenberg. Se encuentra muy buen acuerdo entre el experimento y la teoría en los dos compuestos. La inclusión del campo ligante es muy importante para alcanzar dicho acuerdo. Sin embargo, los resultados del calculo que no incluyen los términos de interferencia estan en mejor acuerdo con el experimento, indicando que el modelo empleado probablemente sobre-estima la importancia de los términos de interferencia.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[x-ray Absorption]]></kwd>
<kwd lng="en"><![CDATA[x-ray emission]]></kwd>
<kwd lng="en"><![CDATA[electronic structure]]></kwd>
<kwd lng="en"><![CDATA[transition metal compounds]]></kwd>
<kwd lng="es"><![CDATA[absorción de rayos x]]></kwd>
<kwd lng="es"><![CDATA[emisión de rayos x]]></kwd>
<kwd lng="es"><![CDATA[estructura electrónica]]></kwd>
<kwd lng="es"><![CDATA[compuestos de metales de transición]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="center"><font face="verdana" size="4"><b>Ligand field and interference effects in L&#150;edge x&#150;ray Raman scattering of MnF<sub>2</sub> and CoF<sub>2</sub></b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>J. Jim&eacute;nez&#150;Mier* <sup>, a</sup>, G.M. Herrera&#150;P&eacute;rez&ordf;, P. Olalde&#150;Velasco&ordf;, D.L. Ederer<sup> b</sup>, and T. Schuler <sup>b</sup>.</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>&ordf; Instituto de Ciencias Nucleares, Universidad Nacional Aut&oacute;noma de M&eacute;xico, 04510 M&eacute;xico DF, M&eacute;xico.* Corresponding author, e&#150;mail: <a href="mailto:jimenez@nucleares.unam.mx">Jim&eacute;nez@nucleares.unam.mx</a>.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>b</sup> Department of Physics, Tulane University, </i><i>New Orleans, LA 70118, U.S.A.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido el 14 de mayo de 2007    <br> Aceptado el 26 de octubre de 2007</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>     <p align="justify"><font face="verdana" size="2">We present experimental results for x&#150;ray absorption and resonant emission at the L&#150;edge of the transition metal in MnF<sub>2</sub> and CoF<sub>2</sub>. The emission data are corrected for self&#150;absorption. The data are compared with calculations in both the free&#150;ion approximation and with the effect of the ligand field of D<i><sub>4h</sub></i> symmetry included. The results of the calculations take into account interference terms in the Kramers&#150;Heisenberg expression. We obtain very good agreement between experiment and theory for both x&#150;ray absorption and resonant emission in the two compounds. The inclusion of the ligand field is important to achieve such agreement. However, the results of the calculation that does not take into account the interference terms are in better agreement with experiment, indicating that the model used probably overestimates the importance of interference effects.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>x&#150;ray Absorption; x&#150;ray emission; electronic structure; transition metal compounds.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2">Presentamos resultados experimentales para absorci&oacute;n y emisi&oacute;n resonante de rayos x en la orilla L del metal de transici&oacute;n en MnF<sub>2</sub> y CoF<sub>2</sub>. Los datos de emisi&oacute;n se presentan corregidos por autoabsorci&oacute;n. Los datos se comparan con c&aacute;lculos en la aproximaci&oacute;n de ion libre y con el efecto de un campo ligante de simetr&iacute;a D<i><sub>4h</sub></i> incluido. Los resultados del calculo toman en cuenta los t&eacute;rminos de interferencia en la expresi&oacute;n de Kramers&#150;Heisenberg. Se encuentra muy buen acuerdo entre el experimento y la teor&iacute;a en los dos compuestos. La inclusi&oacute;n del campo ligante es muy importante para alcanzar dicho acuerdo. Sin embargo, los resultados del calculo que no incluyen los t&eacute;rminos de interferencia estan en mejor acuerdo con el experimento, indicando que el modelo empleado probablemente sobre&#150;estima la importancia de los t&eacute;rminos de interferencia.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores: </b>absorci&oacute;n de rayos x; emisi&oacute;n de rayos x; estructura electr&oacute;nica; compuestos de metales de transici&oacute;n. </font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS: 78.70.Ck; 78.70.En</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v54s1/v54s1a8.pdf">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Acknowledgements</b></font></p>     <p align="justify"><font face="verdana" size="2">We wish to thank Jonathan Denlinger for his expert help at the soft x&#150;ray end station at the ALS. We acknowledge support from DOE&#150;EPSCOR cluster research Grant No. DOE&#150;LEQSF (1993&#150;1995)&#150;03 and from CONACYT M&eacute;xico under grant No. U41007&#150;F. The Advanced Light Source is funded by the Office of Basic Energy Science, U.S. Department of Energy Contract No. DE&#150;AC03&#150;76SF00098.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. A. Kotani, <i>Eur. Phys. J. B </i><b>47</b> (2005) 3.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8348821&pid=S0035-001X200800070000800001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">2. A. Kotani and S. Shin, <i>Rev. Mod. 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