<?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>S0035-001X2007000500012</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[The hydrogen atom via the four-dimensional spherical harmonics]]></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[Calvario Acócal]]></surname>
<given-names><![CDATA[J.L.]]></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>10</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>10</month>
<year>2007</year>
</pub-date>
<volume>53</volume>
<numero>5</numero>
<fpage>407</fpage>
<lpage>414</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2007000500012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2007000500012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2007000500012&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Using the fact that the Schrödinger equation for the stationary states of the hydrogen atom is equivalent to an integral equation on the unit sphere in a four-dimensional space, the eigenvalues, the eigenfunctions, and a dynamical symmetry group for this problem are obtained from the four-dimensional spherical harmonics and the group of rotations on the sphere. It is shown that the four-dimensional spherical harmonics separable in Euler angles correspond to solutions of the time-independent Schrödinger equation that are separable in parabolic coordinates.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Usando el hecho de que la ecuación de Schrödinger para los estados estacionarios del átomo de hidrógeno es equivalente a una ecuación integral sobre la esfera de radio 1 en un espacio de dimensión cuatro, los eigenvalores, las eigenfunciones y un grupo de simetría dinámica para este problema se obtienen a partir de los armónicos esféricos en dimensión cuatro y el grupo de rotaciones sobre la esfera. Se muestra que los armónicos esféricos en dimensión cuatro separables en ángulos de Euler corresponden a soluciones de la ecuación de Schrödinger que son separables en coordenadas parabólicas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Hydrogen atom]]></kwd>
<kwd lng="en"><![CDATA[hidden symmetries]]></kwd>
<kwd lng="en"><![CDATA[four-dimensional spherical harmonics]]></kwd>
<kwd lng="es"><![CDATA[Átomo de hidrógeno]]></kwd>
<kwd lng="es"><![CDATA[simetrías ocultas]]></kwd>
<kwd lng="es"><![CDATA[armónicos esféricos en dimensión cuatro]]></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>The hydrogen atom via the four-dimensional spherical harmonics</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>G.F. Torres del Castillo&ordf;</b> <b>y J.L. Calvario Ac&oacute;cal </b><b><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, 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, Universidad Aut&oacute;noma de Puebla, Apartado postal 1152, 72001 Puebla, Pue., 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 8 de junio de 2007     ]]></body>
<body><![CDATA[<br>   Aceptado el 15 de agosto de 2007</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">Using the fact that the Schr&ouml;dinger equation for the stationary states of the hydrogen atom is equivalent to an integral equation on the unit sphere in a four-dimensional space, the eigenvalues, the eigenfunctions, and a dynamical symmetry group for this problem are obtained from the four-dimensional spherical harmonics and the group of rotations on the sphere. It is shown that the four-dimensional spherical harmonics separable in Euler angles correspond to solutions of the time-independent Schr&ouml;dinger equation that are separable in parabolic coordinates.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>Hydrogen atom; hidden symmetries; four-dimensional spherical harmonics.</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">Usando el hecho de que la ecuaci&oacute;n de Schr&ouml;dinger para los estados estacionarios del &aacute;tomo de hidr&oacute;geno es equivalente a una ecuaci&oacute;n integral sobre la esfera de radio 1 en un espacio de dimensi&oacute;n cuatro, los eigenvalores, las eigenfunciones y un grupo de simetr&iacute;a din&aacute;mica para este problema se obtienen a partir de los arm&oacute;nicos esf&eacute;ricos en dimensi&oacute;n cuatro y el grupo de rotaciones sobre la esfera. Se muestra que los arm&oacute;nicos esf&eacute;ricos en dimensi&oacute;n cuatro separables en &aacute;ngulos de Euler corresponden a soluciones de la ecuaci&oacute;n de Schr&ouml;dinger que son separables en coordenadas parab&oacute;licas.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores:  </b>&Aacute;tomo de hidr&oacute;geno; simetr&iacute;as ocultas; arm&oacute;nicos esf&eacute;ricos en dimensi&oacute;n cuatro.</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.-w; 02.20.-a; 02.30.Gp</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/v53n5/v53n5a12.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>Acknowledgment</b></font></p>     <p align="justify"><font face="verdana" size="2">One of the authors (J.L.C.A.) wishes to thank CONACyT and Dr. Roberto Cartas Fuentevilla for financial support.</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. W. Pauli, <i>Z. 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