<?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>S0035-001X2011000100011</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[The hydrogen atom with an origin centred singularity]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aquino]]></surname>
<given-names><![CDATA[N]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Autónoma Metropolitana-Iztapalapa Departamento de Física ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2011</year>
</pub-date>
<volume>57</volume>
<numero>1</numero>
<fpage>65</fpage>
<lpage>67</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2011000100011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2011000100011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2011000100011&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[We study the problem of a hydrogen atom with an infinitely repulsive singularity at the origin, in two cases: in the first, the electron is free to move throughout space, while in the other, the system is confined in a spherical box of impenetrable walls centred at the nucleus. We show that spherically symmetric s states cannot exist in these systems.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Estudiamos el problema del átomo de hidrógeno con una singularidad infinitamente repulsiva en el origen, en dos casos: en el primero, el electrón se mueve libremente en todo el espacio, mientras que en el otro, el sistema se confina dentro de una caja esférica de paredes impenetrables centrada en el núcleo. Mostramos que no existen estados esfericamente simétricos en este problema.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Confined hydrogen atom]]></kwd>
<kwd lng="en"><![CDATA[energy eigenvalues]]></kwd>
<kwd lng="en"><![CDATA[eigenfunctions]]></kwd>
<kwd lng="es"><![CDATA[Átomo de hidrogeno confinado]]></kwd>
<kwd lng="es"><![CDATA[energías propias]]></kwd>
<kwd lng="es"><![CDATA[funciones propias]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n</font></p> 	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="center"><font face="verdana" size="4"><b>The hydrogen atom with an origin centred singularity</b></font></p> 	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="center"><font face="verdana" size="2"><b>N. Aquino</b></font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2"><i>Departamento de F&iacute;sica, Universidad Aut&oacute;noma Metropolitana&#150;Iztapalapa, Apartado Postal 55&#150;534, M&eacute;xico, 09340 D.F., M&eacute;xico, e&#150;mail:</i> <a href="mailto:naa@xanum.uam.mx">naa@xanum.uam.mx</a>.</font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2">Recibido el 22 de septiembre de 2010    ]]></body>
<body><![CDATA[<br>     Aceptado el 11 de noviembre de 2010</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">We study the problem of a hydrogen atom with an infinitely repulsive singularity at the origin, in two cases: in the first, the electron is free to move throughout space, while in the other, the system is confined in a spherical box of impenetrable walls centred at the nucleus. We show that spherically symmetric <i>s</i> states cannot exist in these systems.</font></p> 	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Confined hydrogen atom; energy eigenvalues; eigenfunctions.</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">Estudiamos el problema del &aacute;tomo de hidr&oacute;geno con una singularidad infinitamente repulsiva en el origen, en dos casos: en el primero, el electr&oacute;n se mueve libremente en todo el espacio, mientras que en el otro, el sistema se confina dentro de una caja esf&eacute;rica de paredes impenetrables centrada en el n&uacute;cleo. Mostramos que no existen estados esfericamente sim&eacute;tricos en este problema.</font></p> 	    <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> &Aacute;tomo de hidrogeno confinado; energ&iacute;as propias; funciones propias.</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.Ge; 31.15.&#150;p</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/v57n1//v57n1a11.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>References</b></font></p> 	    <!-- ref --><p align="justify"><font face="verdana" size="2">1. Y. 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