<?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>S0035-001X2002000500011</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Melting of sodium clusters]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Reyes-Nava]]></surname>
<given-names><![CDATA[Juan A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Garzón]]></surname>
<given-names><![CDATA[Ignacio L.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Beltrán]]></surname>
<given-names><![CDATA[Marcela R.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Michaelian]]></surname>
<given-names><![CDATA[Karo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Autónoma de Mëxico Instituto de Física ]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Nacional Autónoma de Mëxico Instituto de Investigaciones en Materiales ]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></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>5</numero>
<fpage>450</fpage>
<lpage>456</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2002000500011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2002000500011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2002000500011&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Thermal stability properties and the melting-like transition of NaN, N = 13-147, clusters are studied through microcanonical molecular dynamics simulations. The metallic bonding in the sodium clusters is mimicked by a many-body Gupta potential based on the second moment approximation of a tight-binding Hamiltonian. The characteristics of the solid-to-liquid transition in the sodium clusters are analyzed by calculating physical quantities like caloric curves, heat capacities, and root-mean-square bond length fluctuations using simulation times of several nanoseconds. Distinct melting mechanisms are obtained for the sodium clusters in the size range investigated. The calculated melting temperatures show an irregular variation with the cluster size, in qualitative agreement with recent experimental results. However, the calculated melting point for the Na55 cluster is about 40 % lower than the experimental value.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[La fusión y las propiedades de estabilidad térmica de cúmulos de NaN, N = 13-147, se estudian utilizando simulaciones de dinámica molecular en el ensamble microcanónico. El enlace metálico en los cúmulos de sodio se modela con un potencial de Gupta de muchos cuerpos que se basa en la aproximación de segundo momento de un hamiltoniano de amarre fuerte. Las características de la transición sólido a líquido en los cúmulos de sodio se analizan mediante el cálculo de cantidades físicas como la curva calórica, el calor específico y la desviación cuadrática media de las fluctuaciones en las distancias interatómicas, utilizando tiempos de simulación de varios nanosegundos. Mecanismos diferentes de fusión se obtuvieron para cúmulos de sodio en el rango de tamaños investigados. Las temperaturas de fusión calculadas muestran una variación irregular como función del tamaño del cúmulo, en acuerdo cualitativo con resultados experimentales recientes. Sin embargo, el punto de fusión calculado para el cúmulo de Na55 es aproximadamente 40 % más bajo que el valor experimental.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Metal clusters]]></kwd>
<kwd lng="en"><![CDATA[sodium clusters]]></kwd>
<kwd lng="en"><![CDATA[melting in clusters]]></kwd>
<kwd lng="en"><![CDATA[phase transitions in clusters]]></kwd>
<kwd lng="es"><![CDATA[Cúmulos metálicos]]></kwd>
<kwd lng="es"><![CDATA[cúmulos de sodio]]></kwd>
<kwd lng="es"><![CDATA[fusión en cúmulos]]></kwd>
<kwd lng="es"><![CDATA[transición de fase en cúmulos]]></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>Melting of sodium clusters</b></font></p>  	    <p>&nbsp;</p>  	    <p align="center"><font face="verdana" size="2"><b>Juan A. Reyes&#45;Nava, Ignacio L. Garz&oacute;n, Marcela R. Beltr&aacute;n<sup>&dagger;</sup>, Karo Michaelian</b></font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><i>Instituto de F&iacute;sica, Universidad Nacional Aut&oacute;noma de M&eacute;xico Apdo. Post. 20&#45;364, M&eacute;xico D.F., 01000 M&eacute;xico.</i></font></p>  	    <p align="justify"><font face="verdana" size="2"><sup>&dagger;</sup> <i>Instituto de Investigaciones en Materiales, Universidad Nacional Aut&oacute;noma de M&eacute;xico Apdo. Post. 70&#45;360, M&eacute;xico D.F., 01000 M&eacute;xico.</i></font></p>  	    <p>&nbsp;</p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Recibido el 9 de marzo de 2002.    <br> 	Aceptado el 20 de junio de 2002.</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">Thermal stability properties and the melting&#45;like transition of Na<sub><i>N</i></sub>, <i>N</i> = 13&#45;147, clusters are studied through microcanonical molecular dynamics simulations. The metallic bonding in the sodium clusters is mimicked by a many&#45;body Gupta potential based on the second moment approximation of a tight&#45;binding Hamiltonian. The characteristics of the solid&#45;to&#45;liquid transition in the sodium clusters are analyzed by calculating physical quantities like caloric curves, heat capacities, and root&#45;mean&#45;square bond length fluctuations using simulation times of several nanoseconds. Distinct melting mechanisms are obtained for the sodium clusters in the size range investigated. The calculated melting temperatures show an irregular variation with the cluster size, in qualitative agreement with recent experimental results. However, the calculated melting point for the Na<sub>55</sub> cluster is about 40 % lower than the experimental value.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Metal clusters; sodium clusters; melting in clusters; phase transitions in clusters.</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">La fusi&oacute;n y las propiedades de estabilidad t&eacute;rmica de c&uacute;mulos de Na<sub><i>N</i></sub>, <i>N</i> = 13&#45;147, se estudian utilizando simulaciones de din&aacute;mica molecular en el ensamble microcan&oacute;nico. El enlace met&aacute;lico en los c&uacute;mulos de sodio se modela con un potencial de Gupta de muchos cuerpos que se basa en la aproximaci&oacute;n de segundo momento de un hamiltoniano de amarre fuerte. Las caracter&iacute;sticas de la transici&oacute;n s&oacute;lido a l&iacute;quido en los c&uacute;mulos de sodio se analizan mediante el c&aacute;lculo de cantidades f&iacute;sicas como la curva cal&oacute;rica, el calor espec&iacute;fico y la desviaci&oacute;n cuadr&aacute;tica media de las fluctuaciones en las distancias interat&oacute;micas, utilizando tiempos de simulaci&oacute;n de varios nanosegundos. Mecanismos diferentes de fusi&oacute;n se obtuvieron para c&uacute;mulos de sodio en el rango de tama&ntilde;os investigados. Las temperaturas de fusi&oacute;n calculadas muestran una variaci&oacute;n irregular como funci&oacute;n del tama&ntilde;o del c&uacute;mulo, en acuerdo cualitativo con resultados experimentales recientes. Sin embargo, el punto de fusi&oacute;n calculado para el c&uacute;mulo de Na<sub>55</sub> es aproximadamente 40 % m&aacute;s bajo que el valor experimental.</font></p>      <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> C&uacute;mulos met&aacute;licos; c&uacute;mulos de sodio; fusi&oacute;n en c&uacute;mulos; transici&oacute;n de fase en c&uacute;mulos.</font></p>  	    ]]></body>
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