<?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>S0035-001X2006000600007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estructura electrónica de superficies: estados de superficie y estados resonantes del calcio]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Herrera]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mora]]></surname>
<given-names><![CDATA[César]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Politécnico Nacional Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2006</year>
</pub-date>
<volume>52</volume>
<numero>6</numero>
<fpage>534</fpage>
<lpage>539</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2006000600007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2006000600007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2006000600007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[En este artículo presentamos un estudio detallado de la estructura electrónica de bandas de superficies orientadas (001) y (110) de cristales cúbicos centrados en la cara del Ca. Para nuestro estudio utilizamos la aproximación de enlace fuerte y el método de acoplamiento de la función de Green de superficie. Primero, construimos hamiltonianos de enlace fuerte en el formalismo de Slater Koster (SK). Utilizamos una base ortogonal de nueve orbitales atómicos (spd) por átomo en la celda unitaria. Para el estudio de las superficies, utilizamos el método de empalme de la función de Green de superficie. Hallamos que nuestros resultados se comparan aceptablemente con los valores publicados en la literatura, y hacemos la predicción de diferentes estados no reportados aún.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[In this paper we present a detailed study of the electronic band structure of the (001) and (110) surface of the face centered cubic Ca. For our study we use the tight-binding approach and the surface Green function matching method. We use tigth-binding Hamiltonians in the Slater Koster formalism (SK). First, we use an orthogonal atomic basis of nine spd atomic orbitals, for each atom in the unitary cell. For the study of the surfaces we use the surface Green function matching method. We find that our results compare acceptably well with the previous published values, and we make the prediction of new different states not yet reported in the literature.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Estados de superficie]]></kwd>
<kwd lng="es"><![CDATA[mecánica cuántica]]></kwd>
<kwd lng="es"><![CDATA[tipos de superficies]]></kwd>
<kwd lng="es"><![CDATA[fenómenos de la superficie]]></kwd>
<kwd lng="es"><![CDATA[teoría de la estructura del cristal]]></kwd>
<kwd lng="es"><![CDATA[estructura: medidas y simulaciones]]></kwd>
<kwd lng="en"><![CDATA[Surface states]]></kwd>
<kwd lng="en"><![CDATA[quantum mechanics]]></kwd>
<kwd lng="en"><![CDATA[types of surface]]></kwd>
<kwd lng="en"><![CDATA[surface phenomena]]></kwd>
<kwd lng="en"><![CDATA[theory of crystal structure]]></kwd>
<kwd lng="en"><![CDATA[structure: measurements and simulations]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Estructura electr&oacute;nica de superficies: estados de superficie y estados resonantes del calcio</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>H. Herrera y C&eacute;sar Mora</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Centro de Investigaci&oacute;n en Ciencia Aplicada y Tecnolog&iacute;a Avanzada del Instituto Polit&eacute;cnico Nacional, Legaria 694, Colonia Irrigaci&oacute;n, 11500 M&eacute;xico D.F., e-mail: <a href="mailto:herjaher16@hotmail.com">herjaher16@hotmail.com</a> , <a href="mailto:cmoral@ipn.mx">cmoral@ipn.mx</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 3 de agosto de 2006     <br> Aceptado el 13 de noviembre de 2006</font></p>     ]]></body>
<body><![CDATA[<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">En este art&iacute;culo presentamos un estudio detallado de la estructura electr&oacute;nica de bandas de superficies orientadas (001) y (110) de cristales c&uacute;bicos centrados en la cara del Ca. Para nuestro estudio utilizamos la aproximaci&oacute;n de enlace fuerte y el m&eacute;todo de acoplamiento de la funci&oacute;n de Green de superficie. Primero, construimos hamiltonianos de enlace fuerte en el formalismo de Slater Koster (SK). Utilizamos una base ortogonal de nueve orbitales at&oacute;micos <i>(spd) </i>por &aacute;tomo en la celda unitaria. Para el estudio de las superficies, utilizamos el m&eacute;todo de empalme de la funci&oacute;n de Green de superficie. Hallamos que nuestros resultados se comparan aceptablemente con los valores publicados en la literatura, y hacemos la predicci&oacute;n de diferentes estados no reportados a&uacute;n.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores: </b>Estados de superficie; mec&aacute;nica cu&aacute;ntica; tipos de superficies; fen&oacute;menos de la superficie; teor&iacute;a de la estructura del cristal; estructura: medidas y simulaciones.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>     <p align="justify"><font face="verdana" size="2">In this paper we present a detailed study of the electronic band structure of the (001) and (110) surface of the face centered cubic Ca. For our study we use the tight-binding approach and the surface Green function matching method. We use tigth-binding Hamiltonians in the Slater Koster formalism (SK). First, we use an orthogonal atomic basis of nine <i>spd </i>atomic orbitals, for each atom in the unitary cell. For the study of the surfaces we use the surface Green function matching method. We find that our results compare acceptably well with the previous published values, and we make the prediction of new different states not yet reported in the literature.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>Surface states; quantum mechanics; types of surface; surface phenomena; theory of crystal structure; structure: measurements and simulations.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS: 73.20.r; 03.65.w; 68.47.b; 61.30.Hn; 61.57.Ah; 68.03.Hj</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v52n6/v52n6a7.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>Agradecimientos</b></font></p>     <p align="justify"><font face="verdana" size="2">Los autores agradecen el apoyo brindado por D. Olgu&iacute;n, G. Gonz&aacute;lez, J. A. Calder&oacute;n, R. Baquero y A. Rubio. Este trabajo fue parcialmente apoyado por CONACYT, y el proyecto de investigaci&oacute;n SIP 20060859. C. Mora es becario EDI y COFAA-IPN.</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. B. Fitton and R.F. 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