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name="but9" width=90 height=16 border=0></a></td>         </tr>       </table>     </td>   </tr> </table> <!-- #EndEditable -->  <!-- MAIN CONTENT TABLE --> <table width=600 border=0 cellpadding=0 cellspacing=0>   <tr>      <td valign="top" width=132><!-- #BeginEditable "menu" --> <a name="skipnav"></a>        <!--start side bar-->       <img src="../px/simsname_f.gif" alt="L'Institut Steacie des sciences mol&eacute;culaires" width=132 height=92>        <img src="../px/side/progs_f.gif" alt="Programmes" width=132 height=30><br>       <a href="index_f.html"><img src="../px/side/molspec3_f.gif" width=132 height=26 alt="Spectroscopie mol&eacute;culaire" border="0"></a>        <a href="pub_f.html"><img src="../px/side/mn3pubs_f.gif" width="132" height="26" alt="Publications" border="0"></a><br>       <a href="http://infoex.nrc.gc.ca:3339/pls/fb/nrclookup.orgreport?orgno=166&lang=F&inst_top=99&addr="><img src="../px/side/mn3staff_f.gif" width="132" height="26" border="0" alt="Liste du personnel"></a><br>       <a href="projects_f.html"><img src="../px/side/mn3proj_f.gif" width="132" height="26" alt="Projets" border="0"><br>         </a><img src="../px/side/lastline.gif" width=132 height=1 alt="" border=0><!-- #EndEditable --></td>     <!--end side bar-->     <td valign="top" width=18><img src="../px/nowt.gif" alt="" width=18 height=1 border=0></td>     <td width=450 valign="top"><!-- #BeginEditable "content" --><a name="content"><img src="../px/swoosh.jpg" alt="L'Institut Steacie des sciences mol&eacute;culaires" width=450 height=75></a><br>       <!--start main content-->       <H1>Projets en spectroscopie mol&eacute;culaire</H1>       <h2>La spectroscopie th&eacute;orique</h2>       <p> Cette recherche touche &agrave; diff&eacute;rents aspects de l'interpr&eacute;tation          des spectres de mol&eacute;cules en fonction de la m&eacute;canique quantique.</p>       <p> Les projets r&eacute;cents comprennent les spectres Rydberg-Rydberg          de mol&eacute;cules comme l'H3 et l'ArH, qui n'ont qu'un seul &eacute;lectron          Rydberg autour d'un noyau positif &agrave; couches ferm&eacute;es. L'application          de cette m&ecirc;me th&eacute;orie &agrave; l'&eacute;tat Rydberg le plus          bas du groupement CH a men&eacute; &agrave; l'identification d'une &quot;          bande &quot; interstellaire diffuse dans l'ultraviolet lointain comme          &eacute;tant une ligne attribuable au CH.</p>       <p> Un autre projet r&eacute;cent &eacute;tait celui d'utiliser les vibrations          de point z&eacute;ro pour d&eacute;terminer les structures mol&eacute;culaires          &agrave; partir de spectres rotationnels observ&eacute;s pour plusieurs          isotopom&egrave;res. Il s'agit d'un probl&egrave;me d'une certaine importance          pratique.</p>       <p> Les travaux actuels sont ax&eacute;s sur les impr&eacute;cisions dans          plusieurs probl&egrave;mes mol&eacute;culaires. Les fr&eacute;quences          du spectre d&eacute;pendent seulement des valeurs propres de l'op&eacute;rateur          Hamiltonien mol&eacute;culaire, et il est possible que celles-ci ne permettent          pas de d&eacute;terminer tous les param&egrave;tres de l'Hamiltonien.          Ce travail est ax&eacute; actuellement sur les corrections &agrave; apporter          &agrave; l'approximation de Born-Oppenheimer, qui ignore l'inertie des          &eacute;lectrons et pr&eacute;sume qu'ils suivent instantan&eacute;ment          le mouvement des noyaux. Les corrections d&eacute;pendent du rapport de          la masse de l'&eacute;lectron et de la masse des atomes, plut&ocirc;t          que simplement les masses atomiques.</p>       <p> Les autres travaux concernent l'utilisation de la th&eacute;orie des          groupes pour r&eacute;soudre diff&eacute;rents probl&egrave;mes li&eacute;s          &agrave; la sym&eacute;trie des mol&eacute;cules. </p>       <!-- #EndEditable --></td>   </tr> </table> <table width=600 border=0 cellpadding=0 cellspacing=0 summary="Footer">   <colgroup> <col width=150> <col width=450> </colgroup>    <tr>      <td valign="top" width=150><img src="../px/nrcbot.gif" alt="National Research Council-Conseil national de recherches Canada" width=150 height=58></td>     <td valign="top" width=450> <img src="../px/line.gif" alt="" width=450 height=58>        <table width=450 border=0 cellpadding=0 cellspacing=0>         <colgroup> <col width=225> <col width=225> </colgroup>          <tr>            <td>              <!--change published date-->             <p class="menu"> Mise &agrave; jour:                <!-- #BeginDate format:IS1 -->2003-02-06<!-- #EndDate -->             </p>             <!--end published date-->           </td>           <td align="right">              <p class="menur"> <a href="../notices_f.html">Avis Importants</a></p>           </td>         </tr>       </table>     </td>   </tr> </table> </body> <!-- #EndTemplate --></html> 
