{"id":14724,"date":"2021-09-18T16:50:51","date_gmt":"2021-09-18T16:50:51","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=14724"},"modified":"2021-09-29T08:10:25","modified_gmt":"2021-09-29T08:10:25","slug":"spectroscopie-moleculaire-comment-sonder-lunivers-en-laboratoire","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/09\/18\/spectroscopie-moleculaire-comment-sonder-lunivers-en-laboratoire\/","title":{"rendered":"La spectroscopie en laboratoire au secours des astronomes"},"content":{"rendered":"<p><strong>Pour comprendre ce qui se passe tr\u00e8s loin dans l&#8217;Univers, les chercheurs ont besoin d&#8217;identifier de nouvelles mol\u00e9cules en laboratoire.<\/strong><\/p>\n<h5>Des antennes pour traquer les mol\u00e9cules :<\/h5>\n<p>Depuis <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/01\/06\/galilee-le-savant-qui-a-ouvert-nos-yeux-sur-lunivers\/\" target=\"_blank\" rel=\"noopener\">Galil\u00e9e<\/a> il y a quatre si\u00e8cles, les astronomes n&#8217;ont de cesse d&#8217;am\u00e9liorer leurs instruments d&#8217;observation. Objectif : voir toujours plus loin pour mieux comprendre ce qui nous entoure. Mais pour interpr\u00e9ter certaines donn\u00e9es acquises avec les plus puissants instruments, il faut parfois faire un d\u00e9tour par le laboratoire.<\/p>\n<figure id=\"attachment_10888\" aria-describedby=\"caption-attachment-10888\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/06\/alma.jpg\" rel=\"lightbox[14724]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-10888\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/06\/alma-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/06\/alma-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/06\/alma-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/06\/alma-1024x615.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/06\/alma.jpg 1498w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-10888\" class=\"wp-caption-text\">Les antennes du radiot\u00e9lescope ALMA sous la Voie lact\u00e9e. \u00a9 P. Hor\u00e1lek\/ESO<\/figcaption><\/figure>\n<p>Prenez <a href=\"https:\/\/www.eso.org\/public\/france\/teles-instr\/alma\/\" target=\"_blank\" rel=\"noopener\">ALMA<\/a> (<em>Atacama Large Millimeter\/submillimeter Array<\/em>), cet observatoire radiomillim\u00e9trique et submillim\u00e9trique construit au Chili. Dans les informations recueillies par ses antennes, les astronomes retrouvent en g\u00e9n\u00e9ral la signature de nombreuses mol\u00e9cules d\u00e9j\u00e0 connues. Mais il arrive que des raies spectrales enregistr\u00e9es n&#8217;appartiennent \u00e0 aucun compos\u00e9 identifi\u00e9. C&#8217;est l\u00e0 qu&#8217;entre en sc\u00e8ne la spectroscopie mol\u00e9culaire d\u00e9velopp\u00e9e dans certains laboratoires.<!--more--><\/p>\n<h5>Un petit tour en laboratoire :<\/h5>\n<p>Cyril Richard est ing\u00e9nieur de recherche au CNRS. Il travaille au <a href=\"https:\/\/icb.u-bourgogne.fr\/\" target=\"_blank\" rel=\"noopener\">Laboratoire Interdisciplinaire Carnot de Bourgogne<\/a> \u00e0 Dijon. Il est \u00e9galement astronome amateur et participe au d\u00e9veloppement du logiciel de traitement d\u2019images\u00a0<a href=\"https:\/\/www.siril.org\/fr\/\" target=\"_blank\" rel=\"noopener\">Siril<\/a>. Au sein de l&#8217;\u00e9quipe <a href=\"https:\/\/icb.u-bourgogne.fr\/spectroscopie-moleculaire-processus-collisionnels-et-applications\/\" target=\"_blank\" rel=\"noopener\">SMPCA<\/a>, il analyse des spectres mol\u00e9culaires haute r\u00e9solution obtenus en laboratoire.<\/p>\n<p><iframe loading=\"lazy\" title=\"Cyril Richard, Ing\u00e9nieur de Recherche CNRS (\u00e9quipe SMPCA, ICB)\" width=\"474\" height=\"267\" src=\"https:\/\/www.youtube.com\/embed\/2OklAqa6W-E?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>Il nous explique en quoi consiste son travail : &#8220;<em>Lorsqu\u2019une mol\u00e9cule absorbe un photon, les lois de la physique pr\u00e9voient que la mol\u00e9cule r\u00e9\u00e9met un photon d\u2019une autre \u00e9nergie, et donc d\u2019une longueur d\u2019onde d\u00e9pendante de ladite mol\u00e9cule. Mon travail consiste, en utilisant les \u00e9quations de la m\u00e9canique quantique, \u00e0 analyser le spectre haute r\u00e9solution de cette mol\u00e9cule pour le mod\u00e9liser informatiquement. Cette mod\u00e9lisation sert de point de d\u00e9part \u00e0 la recherche de l\u2019esp\u00e8ce \u00e9tudi\u00e9e dans l\u2019espace. Et parfois, gr\u00e2ce \u00e0 cette \u00e9troite collaboration entre astronomes et th\u00e9oriciens en laboratoire, on peut d\u00e9tecter une nouvelle mol\u00e9cule au voisinage d\u2019une \u00e9toile en formation. Ce fut le cas cette ann\u00e9e avec le <a href=\"https:\/\/icb.u-bourgogne.fr\/actualites-fr\/detection-dune-nouvelle-molecule-dans-le-milieu-interstellaire\/\" target=\"_blank\" rel=\"noopener\">dim\u00e9thyl\u00e9ther doublement deut\u00e9r\u00e9<\/a>. &#8220;<\/em><\/p>\n<figure id=\"attachment_14726\" aria-describedby=\"caption-attachment-14726\" style=\"width: 342px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/09\/cyril2.jpg\" rel=\"lightbox[14724]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-14726\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/09\/cyril2-342x450.jpg\" alt=\"\" width=\"342\" height=\"450\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/09\/cyril2-342x450.jpg 342w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/09\/cyril2-777x1024.jpg 777w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/09\/cyril2-768x1012.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/09\/cyril2.jpg 1009w\" sizes=\"auto, (max-width: 342px) 100vw, 342px\" \/><\/a><figcaption id=\"caption-attachment-14726\" class=\"wp-caption-text\">D\u00e9tection du dim\u00e9thyl\u00e9ther doublement deut\u00e9r\u00e9 au voisinage d&#8217;une \u00e9toile en formation. Les courbes noires repr\u00e9sentent les donn\u00e9es du t\u00e9lescope ALMA. En bleu, la mod\u00e9lisation des spectres des compos\u00e9s d\u00e9j\u00e0 d\u00e9tect\u00e9s. En rouge, les raies correspondantes au dim\u00e9thyl\u00e9ther doublement deut\u00e9r\u00e9. \u00a9 Cyril Richard\/SMPCA<\/figcaption><\/figure>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/02\/10\/lhistoire-de-la-nebuleuse-de-la-belle-au-bois-dormant-alias-egb-9\/\" target=\"_blank\" rel=\"noopener\">EGB 9, la n\u00e9buleuse retrouv\u00e9e par des amateurs<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/11\/14\/antennes-dalma-vert-voie-lactee\/\" target=\"_blank\" rel=\"noopener\">Les antennes d&#8217;ALMA en vert sous la Voie lact\u00e9e<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/05\/20\/les-diamants-de-la-nebuleuse-du-collier-ne-sont-pas-eternels\/\" target=\"_blank\" rel=\"noopener\">Les diamants de la n\u00e9buleuse du Collier ne sont pas \u00e9ternels<\/a><\/li>\n<\/ul>\n<p>Suivez l\u2019actualit\u00e9 astronomique et d\u00e9couvrez mes images du ciel en vous abonnant \u00e0 Cielmania sur\u00a0<a href=\"https:\/\/www.facebook.com\/cielmania\/\" target=\"_blank\" rel=\"noopener noreferrer\">Facebook<\/a>\u00a0ou\u00a0<a href=\"https:\/\/twitter.com\/cielmania\" target=\"_blank\" rel=\"noopener noreferrer\">Twitter<\/a>.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Pour comprendre ce qui se passe tr\u00e8s loin dans l&#8217;Univers, les chercheurs ont besoin d&#8217;identifier de nouvelles mol\u00e9cules en laboratoire. Des antennes pour traquer les mol\u00e9cules : Depuis Galil\u00e9e il y a quatre si\u00e8cles, les astronomes n&#8217;ont de cesse d&#8217;am\u00e9liorer leurs instruments d&#8217;observation. Objectif : voir toujours plus loin pour mieux comprendre ce qui nous &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/09\/18\/spectroscopie-moleculaire-comment-sonder-lunivers-en-laboratoire\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">La spectroscopie en laboratoire au secours des astronomes<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":14746,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[87],"tags":[1048,2645],"class_list":["post-14724","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-hommes-et-le-ciel","tag-alma","tag-cyril-richard"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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