<?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>S0035-001X2008000600009</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Bound states of the hydrogen atom in parabolic coordinates]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres del Castillo]]></surname>
<given-names><![CDATA[G.F]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Navarro Morales]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Autónoma de Puebla Instituto de Ciencias Departamento de Física Matemática]]></institution>
<addr-line><![CDATA[Puebla Pue]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Autónoma de Puebla Facultad de Ciencias Físico Matemáticas ]]></institution>
<addr-line><![CDATA[Puebla Pue]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2008</year>
</pub-date>
<volume>54</volume>
<numero>6</numero>
<fpage>454</fpage>
<lpage>458</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2008000600009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2008000600009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2008000600009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[The spectrum and separable eigenfunctions in parabolic coordinates for the bound states of the hydrogen atom, as well as their relation with the separable eigenfunctions in spherical coordinates, are obtained making use of the elementary theory of angular momentum.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se obtiene el espectro y las eigenfunciones separables en coordenadas parabólicas para los estados ligados del átomo de hidrógeno, así como su relación con las eigenfunciones separables en coordenadas esféricas, haciendo uso de la teoría elemental del momento angular.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Hydrogen atom]]></kwd>
<kwd lng="en"><![CDATA[parabolic coordinates]]></kwd>
<kwd lng="en"><![CDATA[angular momentum]]></kwd>
<kwd lng="es"><![CDATA[Átomo de hidrógeno]]></kwd>
<kwd lng="es"><![CDATA[coordenadas parabólicas]]></kwd>
<kwd lng="es"><![CDATA[momento angular]]></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>Bound states of the hydrogen atom in parabolic coordinates</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>G.F. Torres del Castillo&ordf; and E. Navarro Morales<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; Departamento de F&iacute;sica Matem&aacute;tica, </i><i>Instituto de Ciencias, Universidad Aut&oacute;noma de Puebla, </i><i>72570 Puebla, Pue., M&eacute;xico.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>b</sup> Facultad de Ciencias F&iacute;sico Matem&aacute;ticas, </i><i>Universidad Aut&oacute;noma de Puebla, Apartado postal 1152, Puebla, Pue. 72001, M&eacute;xico.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido el 27 de agosto de 2008    ]]></body>
<body><![CDATA[<br> Aceptado el 26 de noviembre de 2008</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">The spectrum and separable eigenfunctions in parabolic coordinates for the bound states of the hydrogen atom, as well as their relation with the separable eigenfunctions in spherical coordinates, are obtained making use of the elementary theory of angular momentum.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>Hydrogen atom; parabolic coordinates; angular momentum.</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">Se obtiene el espectro y las eigenfunciones separables en coordenadas parab&oacute;licas para los estados ligados del &aacute;tomo de hidr&oacute;geno, as&iacute; como su relaci&oacute;n con las eigenfunciones separables en coordenadas esf&eacute;ricas, haciendo uso de la teor&iacute;a elemental del momento angular.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores: </b>&Aacute;tomo de hidr&oacute;geno; coordenadas parab&oacute;licas; momento angular. </font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">PACS: 03.65.Fd, 03.65.Ge</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v54n6/v54n6a9.pdf" target="_blank">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>Acknowledgment</b></font></p>     <p align="justify"><font face="verdana" size="2">One of the authors (E.N.M.) wishes to thank the Vicerrector&iacute;a de Investigaci&oacute;n y Estudios de Posgrado of the Universidad Aut&oacute;noma de Puebla for financial support through the programme "La ciencia en tus manos."</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. 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