{"id":204,"date":"2019-07-19T14:25:44","date_gmt":"2019-07-19T13:25:44","guid":{"rendered":"https:\/\/hebergement.universite-paris-saclay.fr\/SEMFIB\/?p=204"},"modified":"2021-10-04T14:30:20","modified_gmt":"2021-10-04T13:30:20","slug":"imagerie-electronique","status":"publish","type":"post","link":"https:\/\/hebergement.universite-paris-saclay.fr\/SEMFIB\/?p=204","title":{"rendered":"IMAGERIE ELECTRONIQUE"},"content":{"rendered":"\n<p class=\"has-drop-cap justification_texte\">Exemple d&rsquo;imagerie combin\u00e9e, obtenue avec les \u00e9lectrons secondaires (partie sup\u00e9rieure) , et les \u00e9lectrons r\u00e9trodiffus\u00e9es ( partie inf\u00e9rieure). La section efficace de r\u00e9trodiffusion de ces derniers \u00e9tant d\u00e9pendante de la masse des atomes qu\u2019ils rencontrent, on obtient un contraste caract\u00e9ristique de la pr\u00e9sence de plusieurs phases.<\/p>\n\n\n\n<p class=\"has-drop-cap justification_texte\">L&rsquo;objet observ\u00e9 est une sph\u00e9rule cosmique collect\u00e9e dans les glaces de l&rsquo;Antarctique, pr\u00e8s de la station Concordia. Il s&rsquo;agit d&rsquo;une microm\u00e9t\u00e9orite fondue lors de son entr\u00e9e atmosph\u00e9rique, puis recristallis\u00e9 rapidement lorsqu&rsquo;elle est arriv\u00e9e a proximit\u00e9 du sol de glace. D&rsquo;ou ces figures de croissance cristalline dendritique , caract\u00e9ristique de l&rsquo;effet de trempe.  L&rsquo;analyse par spectrom\u00e9trie de rayon X \u00e0 dispersion d&rsquo;\u00e9nergie EDS nous a permis d&rsquo;\u00e9tablir qu&rsquo;elle est constitu\u00e9e de cristaux de magn\u00e9tite (contrastes gris clair\/blanc) et de cristaux d&rsquo;olivine (contrastes gris fonc\u00e9).<\/p>\n\n\n\n<p><em>(Cr\u00e9dit th\u00e9matique  C. Engrand &#8211; CNRS- IJCLab)<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Micro-m\u00e9t\u00e9orite<\/p>\n","protected":false},"author":1,"featured_media":106,"comment_status":"closed","ping_status":"closed","sticky":true,"template":"","format":"standard","meta":{"_vp_format_video_url":"","_vp_image_focal_point":[]},"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/hebergement.universite-paris-saclay.fr\/SEMFIB\/index.php?rest_route=\/wp\/v2\/posts\/204"}],"collection":[{"href":"https:\/\/hebergement.universite-paris-saclay.fr\/SEMFIB\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hebergement.universite-paris-saclay.fr\/SEMFIB\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hebergement.universite-paris-saclay.fr\/SEMFIB\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hebergement.universite-paris-saclay.fr\/SEMFIB\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=204"}],"version-history":[{"count":3,"href":"https:\/\/hebergement.universite-paris-saclay.fr\/SEMFIB\/index.php?rest_route=\/wp\/v2\/posts\/204\/revisions"}],"predecessor-version":[{"id":207,"href":"https:\/\/hebergement.universite-paris-saclay.fr\/SEMFIB\/index.php?rest_route=\/wp\/v2\/posts\/204\/revisions\/207"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hebergement.universite-paris-saclay.fr\/SEMFIB\/index.php?rest_route=\/wp\/v2\/media\/106"}],"wp:attachment":[{"href":"https:\/\/hebergement.universite-paris-saclay.fr\/SEMFIB\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=204"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hebergement.universite-paris-saclay.fr\/SEMFIB\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=204"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hebergement.universite-paris-saclay.fr\/SEMFIB\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=204"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}