<?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>S0035-001X2002000400008</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Química primordial en un modelo no estándar del Big Bang]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lipovka]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Saucedo]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Campos]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Sonora Centro de Investigación en Física ]]></institution>
<addr-line><![CDATA[Hermosillo Sonora]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2002</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2002</year>
</pub-date>
<volume>48</volume>
<numero>4</numero>
<fpage>325</fpage>
<lpage>334</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2002000400008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2002000400008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2002000400008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[En el presente trabajo se considera la formación de moléculas en épocas pregaiácticas caracterizadas por corrimientos al rojo 10 < z < 400. El cálculo de la abundancia de dichas moléculas se ha hecho suponiendo un modelo no estándar del Big Bang que predice abundancias significativas de carbono y oxígeno. Se muestra que para este caso la abundancia relativa de la molécula de CH basada en carbono primordial debe alcanzar un valor superior a 10-14, mientras que las abundancias de moléculas basadas en oxígeno primordial resultan ser insignificantes.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[In the present paper the formation of primordial molecules in pregalactic epochs characterized by redshifts 10 < z < 400 is considered. The calculation of the abundances of these molecules has been made under the assumption of a Non Standard Big Bang Nucleosynthesis (NBBN) which leads to significant abundances of carbon and oxygen. It is shown that for this case the relative abundance of the molecule CH based on primordial carbon should have values higher than 10-14, whereas the molecular abundances of species based on primordial oxygen turn out to be insignificant.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Procesos químicos]]></kwd>
<kwd lng="es"><![CDATA[plasma astrofísico]]></kwd>
<kwd lng="es"><![CDATA[cosmología]]></kwd>
<kwd lng="es"><![CDATA[cálculos de la dinámica de las moléculas en plasmas]]></kwd>
<kwd lng="en"><![CDATA[Chemical processes]]></kwd>
<kwd lng="en"><![CDATA[astrophysical plasma]]></kwd>
<kwd lng="en"><![CDATA[cosmology]]></kwd>
<kwd lng="en"><![CDATA[molecular dynamics calculations in plasmas]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n</font></p>  	    <p>&nbsp;</p>  	    <p align="center"><font face="verdana" size="4"><b>Qu&iacute;mica primordial en un modelo no est&aacute;ndar del <i>Big Bang</i></b></font></p>  	    <p>&nbsp;</p>  	    <p align="center"><font face="verdana" size="2"><b>A. Lipovka, J. Saucedo, J. Campos</b></font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><i>Centro de Investigaci&oacute;n en F&iacute;sica, Universidad de Sonora Rosales y Blvd. Transversal, Col. Centro, Edif. 3&#45;183000, Apdo. Post. 5&#45;088, Hermosillo Sonora, M&eacute;xico.</i> e&#45;mail: <a href="mailto:aal@cajeme.cifus.uson.mx">aal@cajeme.cifus.uson.mx</a></font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2">Recibido el 11 de enero de 2002.    ]]></body>
<body><![CDATA[<br> 	Aceptado el 3 de junio de 2002.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2">En el presente trabajo se considera la formaci&oacute;n de mol&eacute;culas en &eacute;pocas pregai&aacute;cticas caracterizadas por corrimientos al rojo 10 <i>&lt; z &lt;</i> 400. El c&aacute;lculo de la abundancia de dichas mol<i>&eacute;</i>culas se ha hecho suponiendo un modelo no est&aacute;ndar del <i>Big Bang</i> que predice abundancias significativas de carbono y ox&iacute;geno. Se muestra que para este caso la abundancia relativa de la mol&eacute;cula de <i>CH</i> basada en carbono primordial debe alcanzar un valor superior a 10<sup>&#45;14</sup>, mientras que las abundancias de mol&eacute;culas basadas en ox&iacute;geno primordial resultan ser insignificantes.</font></p>      <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> Procesos qu&iacute;micos; plasma astrof&iacute;sico; cosmolog&iacute;a; c&aacute;lculos de la din&aacute;mica de las mol&eacute;culas en plasmas.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">In the present paper the formation of primordial molecules in pregalactic epochs characterized by redshifts 10 &lt; <i>z</i> &lt; 400 is considered. The calculation of the abundances of these molecules has been made under the assumption of a Non Standard Big Bang Nucleosynthesis (NBBN) which leads to significant abundances of carbon and oxygen. It is shown that for this case the relative abundance of the molecule <i>CH</i> based on primordial carbon should have values higher than 10<sup>&#45;14</sup>, whereas the molecular abundances of species based on primordial oxygen turn out to be insignificant.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Chemical processes; astrophysical plasma; cosmology; molecular dynamics calculations in plasmas.</font></p>  	    <p>&nbsp;</p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">PACS: 95.30.F; 95.30.Q; 98.80; 52.65.Y</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v48n4/v48n4a8.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>  	    <p>&nbsp;</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 al &aacute;rbitro por sus comentarios y sugerencias, los cuales han ayudado a mejorar substancialmente este art&iacute;culo.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1. F. Zwicky, <i>PASP</i><b> 71</b> (1959) 468.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8288780&pid=S0035-001X200200040000800001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
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