<?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>1870-249X</journal-id>
<journal-title><![CDATA[Journal of the Mexican Chemical Society]]></journal-title>
<abbrev-journal-title><![CDATA[J. Mex. Chem. Soc]]></abbrev-journal-title>
<issn>1870-249X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Química de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-249X2008000100015</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Ethane Internal Rotation -Vibrational Hamiltonian]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hidalgo-Olguín]]></surname>
<given-names><![CDATA[David Ricardo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villa]]></surname>
<given-names><![CDATA[María]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Senent]]></surname>
<given-names><![CDATA[María Luisa]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mora-Delgado]]></surname>
<given-names><![CDATA[Marco Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Autónoma Metropolitana Departamento de Química, Ciencias Básicas e Ingeniería ]]></institution>
<addr-line><![CDATA[México D.F]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto de Estructura de la Materia Departamento de Astrofísica Molecular e Infrarroja ]]></institution>
<addr-line><![CDATA[Madrid ]]></addr-line>
<country>España</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2008</year>
</pub-date>
<volume>52</volume>
<numero>1</numero>
<fpage>98</fpage>
<lpage>102</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-249X2008000100015&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-249X2008000100015&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-249X2008000100015&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[One of the main purposes of a theoretical spectroscopist is to propose a model to reproduce the xperimental spectra available in the literature as accurate and with as much physical information as possible. In this case it has been studied the Far infrared an Infrared spectra of non-rigid molecules, introducing in the Vibrational Potential their dependence on the large amplitude variables. The molecule that has been selected to test our proposed Hamiltonian is ethane which is a very well studied molecule. The molecule is a non-rigid molecule and their experimental spectra have been reported in the literature.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Uno de los objetivos principales de un espectroscopísta teórico es generar un modelo que reproduzca los espectros experimentales con la mayor precisión e información física posible. En este caso se estudió el espectro en el Infrarrojo lejano e Infrarrojo de moléculas no rígidas introduciendo en el potencial vibracional su dependencia de las variables de gran amplitud. La molécula de etano fue seleccionada para comprobar nuestro Hamiltoniano propuesto, ya que es una molécula ampliamente estudiada.; además de ser una molécula no rígida cuyo espectro experimental ha sido reportado en la literatura.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Ethane]]></kwd>
<kwd lng="en"><![CDATA[ab initio]]></kwd>
<kwd lng="en"><![CDATA[FIR-IR Spectrum]]></kwd>
<kwd lng="es"><![CDATA[Etano]]></kwd>
<kwd lng="es"><![CDATA[ab initio]]></kwd>
<kwd lng="es"><![CDATA[espectro de ir lejano]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Article</font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Ethane Internal Rotation &#150;Vibrational Hamiltonian</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>David Ricardo Hidalgo&#150;Olgu&iacute;n,<sup>1</sup> Mar&iacute;a Villa<sup>1 *</sup>, Mar&iacute;a Luisa Senent,<sup>2</sup> and Marco Antonio Mora&#150;Delgado<sup>1</sup></b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>1</sup> Departamento de Qu&iacute;mica, Ciencias B&aacute;sicas e Ingenier&iacute;a, Universidad Aut&oacute;noma Metropolitana. Av. San Rafael Atl&iacute;xco 186, Col. Vicentina, Iztapalapa, C.P., 09340 M&eacute;xico, D.F., M&eacute;xico.<sup>*</sup>Responsible author: </i><a href="mailto:mvv@xanum.uam.mx">mvv@xanum.uam.mx</a>.</font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>2</sup> Departamento de Astrof&iacute;sica Molecular e Infrarroja, Instituto de Estructura de la Materia, C.S.I.C.,Serrano 113 b, Madrid 28006, Espa&ntilde;a. E&#150;mail:</i> <a href="mailto:mvv@xanum.uam.mx">mvv@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 27 de septiembre del 2007    ]]></body>
<body><![CDATA[<br>   Aceptado el 1 de abril 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">One of the main purposes of a theoretical spectroscopist is to propose a model to reproduce the xperimental spectra available in the literature as accurate and with as much physical information as possible. In this case it has been studied the Far infrared an Infrared spectra of non&#150;rigid molecules, introducing in the Vibrational Potential their dependence on the large amplitude variables. The molecule that has been selected to test our proposed Hamiltonian is ethane which is a very well studied molecule. The molecule is a non&#150;rigid molecule and their experimental spectra have been reported in the literature.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>Ethane, <i>ab initio, </i>FIR&#150;IR Spectrum.</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">Uno de los objetivos principales de un espectroscop&iacute;sta te&oacute;rico es generar un modelo que reproduzca los espectros experimentales con la mayor precisi&oacute;n e informaci&oacute;n f&iacute;sica posible. En este caso se estudi&oacute; el espectro en el Infrarrojo lejano e Infrarrojo de mol&eacute;culas no r&iacute;gidas introduciendo en el potencial vibracional su dependencia de las variables de gran amplitud. La mol&eacute;cula de etano fue seleccionada para comprobar nuestro Hamiltoniano propuesto, ya que es una mol&eacute;cula ampliamente estudiada.; adem&aacute;s de ser una mol&eacute;cula no r&iacute;gida cuyo espectro experimental ha sido reportado en la literatura.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave: </b>Etano, <i>ab initio, </i>espectro de ir lejano.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><a href="/pdf/jmcs/v52n1/v52n1a15.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. Smeyers, Y. G. <i>Teor&iacute;a de Grupos para Mol&eacute;culas no r&iacute;gidas. El Grupo Local. Las aplicaciones; </i>in Memorias de la Real Academia de Ciencias Exactas, F&iacute;sicas y Naturales de Madrid. Tomo XIII. 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