<?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>S0035-001X2013000400003</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Collinear inelastic collisions of an atom and a diatomic molecule using operator methods]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Wendler]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Récamier]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Berrondo]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Brigham Young University Department Physics and Astronomy ]]></institution>
<addr-line><![CDATA[Provo UT]]></addr-line>
<country>USA</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Ciencias Físicas ]]></institution>
<addr-line><![CDATA[Cuernavaca Morelos]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2013</year>
</pub-date>
<volume>59</volume>
<numero>4</numero>
<fpage>296</fpage>
<lpage>301</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2013000400003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2013000400003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2013000400003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[We calculate transition probabilities between vibrational levels of a diatomic molecule induced by an incident atom. Our prototype model is constructed treating the relative translation of the colliding species as a classical variable. The vibrational states of the diatomic molecule are treated quantum mechanically in terms of the evolution operator without involving wave functions. The corresponding equations of motion are coupled quasi-classically. For illustration purposes we present applications to the time dependence of transition probabilities for different initial and final states as well as a canonical ensemble of initial conditions.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Calculamos probabilidades de transición entre estados vibracionales de una molécula diatómica inducidas por un átomo incidente. El modelo prototipo trata el movimiento de traslación relativo como una variable clásica. Los estados vibracionales de la molecula diatómica se tratan cuánticamente en términos del operador de evolucián, sin involucrar funciones de onda. Las ecuaciones de movimiento correspondientes se acoplan cuasi-clásicamente. A manera de ilustración presentamos aplicaciones a la dependencia temporal de probabilidades de transición para diferentes estados inicial y final así como para un ensamble canónico de condiciones iniciales.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Inelastic]]></kwd>
<kwd lng="en"><![CDATA[collisions]]></kwd>
<kwd lng="en"><![CDATA[Lie]]></kwd>
<kwd lng="en"><![CDATA[algebraic]]></kwd>
<kwd lng="en"><![CDATA[harmonic]]></kwd>
<kwd lng="en"><![CDATA[oscillator]]></kwd>
<kwd lng="es"><![CDATA[Colisiones]]></kwd>
<kwd lng="es"><![CDATA[inelásticas]]></kwd>
<kwd lng="es"><![CDATA[álgebras]]></kwd>
<kwd lng="es"><![CDATA[Lie]]></kwd>
<kwd lng="es"><![CDATA[oscilador]]></kwd>
<kwd lng="es"><![CDATA[armónico]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Research</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>              <p align="center"><font face="verdana" size="4"><b>Collinear inelastic collisions of an atom and a diatomic molecule using operator methods</b></font></p>              <p align="center"><font face="verdana" size="2">&nbsp;</font></p>              <p align="center"><font face="verdana" size="2"><b>T. Wendler<sup>a</sup>, J. R&eacute;camier<sup>b</sup>, and M. Berrondo<sup>a</sup></b></font></p>              <p align="center"><font face="verdana" size="2">&nbsp;</font></p>              <p align="justify"><font face="verdana" size="2"><i><sup>a</sup> Dept. Physics and Astronomy, Brigham Young University, Provo, UT84602 USA. </i></font></p>              <p align="justify"><font face="verdana" size="2"><i><sup>b</sup> Instituto de Ciencias F&iacute;sicas, Universidad Nacional Aut&oacute;noma de M&eacute;xico, Apartado Postal 48&#45;3, Cuernavaca, Morelos 62251, M&eacute;xico.</i></font></p>              <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>              ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Received 21 January 2013     <br>     Accepted 21 February 2013</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 calculate transition probabilities between vibrational levels of a diatomic molecule induced by an incident atom. Our prototype model is constructed treating the relative translation of the colliding species as a classical variable. The vibrational states of the diatomic molecule are treated quantum mechanically in terms of the evolution operator without involving wave functions. The corresponding equations of motion are coupled quasi&#45;classically. For illustration purposes we present applications to the time dependence of transition probabilities for different initial and final states as well as a canonical ensemble of initial conditions.</font></p>          <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Inelastic; collisions; Lie; algebraic; harmonic; oscillator</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">Calculamos probabilidades de transici&oacute;n entre estados vibracionales de una mol&eacute;cula diat&oacute;mica inducidas por un &aacute;tomo incidente. El modelo prototipo trata el movimiento de traslaci&oacute;n relativo como una variable cl&aacute;sica. Los estados vibracionales de la molecula diat&oacute;mica se tratan cu&aacute;nticamente en t&eacute;rminos del operador de evoluci&aacute;n, sin involucrar funciones de onda. Las ecuaciones de movimiento correspondientes se acoplan cuasi&#45;cl&aacute;sicamente. A manera de ilustraci&oacute;n presentamos aplicaciones a la dependencia temporal de probabilidades de transici&oacute;n para diferentes estados inicial y final as&iacute; como para un ensamble can&oacute;nico de condiciones iniciales.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> Colisiones; inel&aacute;sticas; &aacute;lgebras; Lie; oscilador; arm&oacute;nico.</font></p>              ]]></body>
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