{"id":1107,"date":"2021-07-13T12:30:01","date_gmt":"2021-07-13T10:30:01","guid":{"rendered":"http:\/\/127.0.0.1\/?page_id=1107"},"modified":"2025-06-04T17:32:34","modified_gmt":"2025-06-04T15:32:34","slug":"formation-refroidissement-et-spectroscopie-de-molecules-neutres-et-ionisees","status":"publish","type":"page","link":"http:\/\/www.lac.universite-paris-saclay.fr\/?page_id=1107","title":{"rendered":"OR 2 : Processus dynamiques \u00e9l\u00e9mentaires"},"content":{"rendered":"<div  class=\"wp-block-ultimate-post-heading ultp-block-3f5ad5\"><div class=\"ultp-block-wrapper\"><div class=\"ultp-heading-wrap ultp-heading-style9 ultp-heading-center\"><h1 class=\"ultp-heading-inner\"><span>Processus dynamiques \u00e9l\u00e9mentaires<\/span><\/h1><\/div><\/div><\/div>\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-1 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:66.66%\">\n<div id=\"section-g-plllnln\" class=\"wp-block-gutentor-e1 section-g-plllnln gutentor-element gutentor-element-advanced-text text-align-justify-desktop text-align-justify-tablet text-align-justify-mobile\"><div class=\"gutentor-text-wrap\"><p class=\"gutentor-text\">Cette OR utilise comme pr\u00e9alable n\u00e9cessaire les calculs de structure des atomes, mol\u00e9cules et ions effectu\u00e9s dans l\u2019OR1 combin\u00e9s avec des donn\u00e9es spectroscopiques quand elles existent pour pr\u00e9dire de la fa\u00e7on la plus fiable possible des sch\u00e9mas de formation de ces particules dans leur \u00e9tat fondamental absolu et aussi pour interpr\u00e9ter les spectres et les observations faites par nos collaborateurs exp\u00e9rimentateurs. <\/p><\/div><\/div>\n\n\n<div class=\"wp-block-ub-content-toggle wp-block-ub-content-toggle-block\" id=\"ub-content-toggle-block-d64376cd-92dc-4a85-a4eb-5cd4752e40b0\" data-mobilecollapse=\"false\" data-desktopcollapse=\"true\" data-preventcollapse=\"false\" data-showonlyone=\"false\">\n<div class=\"wp-block-ub-content-toggle-accordion\" style=\"border-color: #f1f1f1; \" id=\"ub-content-toggle-panel-block-\">\n\t\t\t<div class=\"wp-block-ub-content-toggle-accordion-title-wrap\" style=\"background-color: #f1f1f1;\" aria-controls=\"ub-content-toggle-panel-0-d64376cd-92dc-4a85-a4eb-5cd4752e40b0\" tabindex=\"0\">\n\t\t\t<p class=\"wp-block-ub-content-toggle-accordion-title ub-content-toggle-title-d64376cd-92dc-4a85-a4eb-5cd4752e40b0\" style=\"color: #000000; \">Formation et refroidissement de mol\u00e9cules<\/p>\n\t\t\t<div class=\"wp-block-ub-content-toggle-accordion-toggle-wrap right\" style=\"color: #000000;\"><span class=\"wp-block-ub-content-toggle-accordion-state-indicator wp-block-ub-chevron-down\"><\/span><\/div>\n\t\t<\/div>\n\t\t\t<div role=\"region\" aria-expanded=\"false\" class=\"wp-block-ub-content-toggle-accordion-content-wrap ub-hide\" id=\"ub-content-toggle-panel-0-d64376cd-92dc-4a85-a4eb-5cd4752e40b0\">\n\n<p><\/p>\n\n\n\n<div id=\"section-g-l3n3ye3\" class=\"wp-block-gutentor-e1 section-g-l3n3ye3 gutentor-element gutentor-element-advanced-text text-align-justify-desktop text-align-justify-tablet text-align-justify-mobile\"><div class=\"gutentor-text-wrap\"><p class=\"gutentor-text\">La deuxi\u00e8me \u00e9tude, en collaboration avec le Br\u00e9sil, consiste \u00e0 unir nos efforts pour inventer de nouveaux sch\u00e9mas de refroidissement de mol\u00e9cules possiblement transposables \u00e0 une majorit\u00e9 de mol\u00e9cules et non seulement aux mol\u00e9cules bialcalines. Guid\u00e9s par nos simulations \u00e9labor\u00e9es \u00e0 l\u2019aide de calculs de structure mol\u00e9culaire, les exp\u00e9rimentateurs produiront des mol\u00e9cules de Rb2 directement \u00e0 partir d\u2019un jet mol\u00e9culaire supersonique en mettant en oeuvre une technique de pompage optique rovibrationnelle.<\/p><\/div><\/div>\n\n<\/div>\n\t\t<\/div>\n\n<div class=\"wp-block-ub-content-toggle-accordion\" style=\"border-color: #f1f1f1; \" id=\"ub-content-toggle-panel-block-\">\n\t\t\t<div class=\"wp-block-ub-content-toggle-accordion-title-wrap\" style=\"background-color: #f1f1f1;\" aria-controls=\"ub-content-toggle-panel-1-d64376cd-92dc-4a85-a4eb-5cd4752e40b0\" tabindex=\"0\">\n\t\t\t<p class=\"wp-block-ub-content-toggle-accordion-title ub-content-toggle-title-d64376cd-92dc-4a85-a4eb-5cd4752e40b0\" style=\"color: #000000; \">Contr\u00f4le de collisions mol\u00e9culaires<\/p>\n\t\t\t<div class=\"wp-block-ub-content-toggle-accordion-toggle-wrap right\" style=\"color: #000000;\"><span class=\"wp-block-ub-content-toggle-accordion-state-indicator wp-block-ub-chevron-down\"><\/span><\/div>\n\t\t<\/div>\n\t\t\t<div role=\"region\" aria-expanded=\"false\" class=\"wp-block-ub-content-toggle-accordion-content-wrap ub-hide\" id=\"ub-content-toggle-panel-1-d64376cd-92dc-4a85-a4eb-5cd4752e40b0\">\n\n<div id=\"section-g-dv7138m\" class=\"wp-block-gutentor-e1 section-g-dv7138m gutentor-element gutentor-element-advanced-text text-align-justify-desktop text-align-justify-tablet text-align-justify-mobile\"><div class=\"gutentor-text-wrap\"><p class=\"gutentor-text\">La premi\u00e8re \u00e9tude a pour but de progresser dans la compr\u00e9hension des processus collisionnels in\u00e9lastiques responsables de la dur\u00e9e de vie limit\u00e9e des \u00e9chantillons des mol\u00e9cules froides dans leur \u00e9tat fondamental absolu ce qui permettra de les \u00e9viter ou au contraire de les favoriser gr\u00e2ce \u00e0 un photon laser de fr\u00e9quence bien choisie pour orienter la r\u00e9action vers des produits bien d\u00e9finis. Sonder et contr\u00f4ler ces r\u00e9actions chimiques en \u00e9tudiant l\u2019interaction lumi\u00e8re\u2010mol\u00e9cules sera l\u2019objectif principal de cette \u00e9tude qui permettra d\u2019\u00e9viter la perte des mol\u00e9cules et aussi qui permettra de d\u00e9couvrir des m\u00e9canismes efficaces de formation de complexes polyatomiques ultra froids.<\/p><\/div><\/div>\n\n\n<div class=\"wp-block-ub-content-toggle wp-block-ub-content-toggle-block\" id=\"ub-content-toggle-block-74deeb2e-edf2-4e02-bfff-25e4914eaffd\" data-mobilecollapse=\"false\" data-desktopcollapse=\"true\" data-preventcollapse=\"false\" data-showonlyone=\"false\">\n<div class=\"wp-block-ub-content-toggle-accordion\" style=\"border-color: #f1f1f1; \" id=\"ub-content-toggle-panel-block-\">\n\t\t\t<div class=\"wp-block-ub-content-toggle-accordion-title-wrap\" style=\"background-color: #f1f1f1;\" aria-controls=\"ub-content-toggle-panel-0-74deeb2e-edf2-4e02-bfff-25e4914eaffd\" tabindex=\"0\">\n\t\t\t<p class=\"wp-block-ub-content-toggle-accordion-title ub-content-toggle-title-74deeb2e-edf2-4e02-bfff-25e4914eaffd\" style=\"color: #000000; \">Par champ \u00e9lectrique<\/p>\n\t\t\t<div class=\"wp-block-ub-content-toggle-accordion-toggle-wrap right\" style=\"color: #000000;\"><span class=\"wp-block-ub-content-toggle-accordion-state-indicator wp-block-ub-chevron-down\"><\/span><\/div>\n\t\t<\/div>\n\t\t\t<div role=\"region\" aria-expanded=\"false\" class=\"wp-block-ub-content-toggle-accordion-content-wrap ub-hide\" id=\"ub-content-toggle-panel-0-74deeb2e-edf2-4e02-bfff-25e4914eaffd\"><\/div>\n\t\t<\/div>\n\n<div class=\"wp-block-ub-content-toggle-accordion\" style=\"border-color: #f1f1f1; \" id=\"ub-content-toggle-panel-block-\">\n\t\t\t<div class=\"wp-block-ub-content-toggle-accordion-title-wrap\" style=\"background-color: #f1f1f1;\" aria-controls=\"ub-content-toggle-panel-1-74deeb2e-edf2-4e02-bfff-25e4914eaffd\" tabindex=\"0\">\n\t\t\t<p class=\"wp-block-ub-content-toggle-accordion-title ub-content-toggle-title-74deeb2e-edf2-4e02-bfff-25e4914eaffd\" style=\"color: #000000; \">Dans le domaine micro-onde<\/p>\n\t\t\t<div class=\"wp-block-ub-content-toggle-accordion-toggle-wrap right\" style=\"color: #000000;\"><span class=\"wp-block-ub-content-toggle-accordion-state-indicator wp-block-ub-chevron-down\"><\/span><\/div>\n\t\t<\/div>\n\t\t\t<div role=\"region\" aria-expanded=\"false\" class=\"wp-block-ub-content-toggle-accordion-content-wrap ub-hide\" id=\"ub-content-toggle-panel-1-74deeb2e-edf2-4e02-bfff-25e4914eaffd\"><\/div>\n\t\t<\/div>\n\n<div class=\"wp-block-ub-content-toggle-accordion\" style=\"border-color: #f1f1f1; \" id=\"ub-content-toggle-panel-block-\">\n\t\t\t<div class=\"wp-block-ub-content-toggle-accordion-title-wrap\" style=\"background-color: #f1f1f1;\" aria-controls=\"ub-content-toggle-panel-2-74deeb2e-edf2-4e02-bfff-25e4914eaffd\" tabindex=\"0\">\n\t\t\t<p class=\"wp-block-ub-content-toggle-accordion-title ub-content-toggle-title-74deeb2e-edf2-4e02-bfff-25e4914eaffd\" style=\"color: #000000; \">Dans le domaine optique<\/p>\n\t\t\t<div class=\"wp-block-ub-content-toggle-accordion-toggle-wrap right\" style=\"color: #000000;\"><span class=\"wp-block-ub-content-toggle-accordion-state-indicator wp-block-ub-chevron-down\"><\/span><\/div>\n\t\t<\/div>\n\t\t\t<div role=\"region\" aria-expanded=\"false\" class=\"wp-block-ub-content-toggle-accordion-content-wrap ub-hide\" id=\"ub-content-toggle-panel-2-74deeb2e-edf2-4e02-bfff-25e4914eaffd\"><\/div>\n\t\t<\/div>\n<\/div>\n<\/div>\n\t\t<\/div>\n\n<div class=\"wp-block-ub-content-toggle-accordion\" style=\"border-color: #f1f1f1; \" id=\"ub-content-toggle-panel-block-\">\n\t\t\t<div class=\"wp-block-ub-content-toggle-accordion-title-wrap\" style=\"background-color: #f1f1f1;\" aria-controls=\"ub-content-toggle-panel-2-d64376cd-92dc-4a85-a4eb-5cd4752e40b0\" tabindex=\"0\">\n\t\t\t<p class=\"wp-block-ub-content-toggle-accordion-title ub-content-toggle-title-d64376cd-92dc-4a85-a4eb-5cd4752e40b0\" style=\"color: #000000; \">Transfert de charge<\/p>\n\t\t\t<div class=\"wp-block-ub-content-toggle-accordion-toggle-wrap right\" style=\"color: #000000;\"><span class=\"wp-block-ub-content-toggle-accordion-state-indicator wp-block-ub-chevron-down\"><\/span><\/div>\n\t\t<\/div>\n\t\t\t<div role=\"region\" aria-expanded=\"false\" class=\"wp-block-ub-content-toggle-accordion-content-wrap ub-hide\" id=\"ub-content-toggle-panel-2-d64376cd-92dc-4a85-a4eb-5cd4752e40b0\">\n\n<p><\/p>\n\n\n\n<div id=\"section-g-466241q\" class=\"wp-block-gutentor-e1 section-g-466241q gutentor-element gutentor-element-advanced-text text-align-justify-desktop text-align-justify-tablet text-align-justify-mobile\"><div class=\"gutentor-text-wrap\"><p class=\"gutentor-text\">Les investigations sur les collisions ultra\u2010froides ion\u2010atome et la formation d\u2019ions mol\u00e9culaires ultra\u2010froids sujet de la th\u00e8se de X. Xing (soutenance pr\u00e9vue \u00e0 l\u2019automne 2021), se poursuivront en \u00e9tendant les d\u00e9veloppements num\u00e9riques de cette th\u00e8se au couple (Rb,Sr+). En effet, lors de la collaboration initi\u00e9e avec le groupe de R. Ozeri (Weizmann Institute, Israel), nous avions limit\u00e9 le mod\u00e8le th\u00e9orique \u00e0 une approche collisionnelle semi\u2010classique qui r\u00e9v\u00e9lait quelques d\u00e9saccords avec les r\u00e9sultats exp\u00e9rimentaux. Ceux\u2010ci devraient s\u2019estomper dans le cadre du mod\u00e8le quantique mise en oeuvre par X. Xing. Ces calculs seront \u00e9tendus \u00e0 un couple d\u2019esp\u00e8ces plus l\u00e9g\u00e8re, (Li,Ca+), \u00e9tudi\u00e9s par l\u2019\u00e9quipe de T. Mukuyama (Osaka, Japon), et qui int\u00e9resse aussi celle de S. Rangwala (RRI, Bangalore, Inde).<\/p><\/div><\/div>\n\n<\/div>\n\t\t<\/div>\n\n<div class=\"wp-block-ub-content-toggle-accordion\" style=\"border-color: #f1f1f1; \" id=\"ub-content-toggle-panel-block-\">\n\t\t\t<div class=\"wp-block-ub-content-toggle-accordion-title-wrap\" style=\"background-color: #f1f1f1;\" aria-controls=\"ub-content-toggle-panel-3-d64376cd-92dc-4a85-a4eb-5cd4752e40b0\" tabindex=\"0\">\n\t\t\t<p class=\"wp-block-ub-content-toggle-accordion-title ub-content-toggle-title-d64376cd-92dc-4a85-a4eb-5cd4752e40b0\" style=\"color: #000000; \">Chaos en physique mol\u00e9culaire<\/p>\n\t\t\t<div class=\"wp-block-ub-content-toggle-accordion-toggle-wrap right\" style=\"color: #000000;\"><span class=\"wp-block-ub-content-toggle-accordion-state-indicator wp-block-ub-chevron-down\"><\/span><\/div>\n\t\t<\/div>\n\t\t\t<div role=\"region\" aria-expanded=\"false\" class=\"wp-block-ub-content-toggle-accordion-content-wrap ub-hide\" id=\"ub-content-toggle-panel-3-d64376cd-92dc-4a85-a4eb-5cd4752e40b0\">\n\n<p><\/p>\n\n\n\n<div id=\"section-g-2ds3j1u\" class=\"wp-block-gutentor-e1 section-g-2ds3j1u gutentor-element gutentor-element-advanced-text text-align-justify-desktop text-align-justify-tablet text-align-justify-mobile\"><div class=\"gutentor-text-wrap\"><p class=\"gutentor-text\">La derni\u00e8re \u00e9tude est men\u00e9e par Fr\u00e9deric Carlier \u00e0 l\u2019\u00e9tude th\u00e9orique des r\u00e9gimes de chaos classique et quantique dans les mol\u00e9cules diatomiques. La signature du chaos classique a \u00e9t\u00e9 observ\u00e9e dans les spectres de l\u2019atome d\u2019hydrog\u00e8ne ou de lithium en pr\u00e9sence d\u2019un champ magn\u00e9tique intense (Th\u00e8se de N. Bouloufa, 1993). Le probl\u00e8me du chaos a \u00e9t\u00e9 aussi \u00e9tudi\u00e9 dans le cas de l\u2019interaction coulombienne \u00e0 trois corps par D. Delande (Th\u00e8se B.Gr\u00e9maud 2006) pour les atomes \u00e0 deux \u00e9lectrons. Nous \u00e9tendons cette derni\u00e8re \u00e9tude \u00e0 la physique mol\u00e9culaire en \u00e9tudiant la mol\u00e9cule H2 ou Li2 en calculant d\u2019abord les sections de Poincar\u00e9 en fonction de param\u00e8tres bien choisis pour \u00e9tudier la dynamique classique avec transition vers le chaos avant de nous int\u00e9resser aux liens qui peuvent exister avec la m\u00e9canique quantique.<\/p><\/div><\/div>\n\n<\/div>\n\t\t<\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:33.33%\"><div  class=\"wp-block-ultimate-post-heading ultp-block-f5e5a2\"><div class=\"ultp-block-wrapper\"><div class=\"ultp-heading-wrap ultp-heading-style1 ultp-heading-left\"><h2 class=\"ultp-heading-inner\"><span>Membres<\/span><\/h2><\/div><\/div><\/div>\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:16px\"><b>N. BOULOUFA<\/b><br><a href=\"mailto:goulven.quemener@universite-paris-saclay.fr\" target=\"_blank\" rel=\"noreferrer noopener\">nadia.bouloufa_at_universite-paris-saclay.fr.<\/a><br><br><\/li>\n\n\n\n<li style=\"font-size:16px\">G. QUEMENER<br><a href=\"mailto:nadia.bouloufa@u-psud.fr\" target=\"_blank\" rel=\"noreferrer noopener\">goulven.quemener_at_cnrs.fr<\/a><br><br><\/li>\n\n\n\n<li style=\"font-size:16px\">O. DULIEU<br><a href=\"mailto:olivier.dulieu@universite-paris-saclay.fr\" target=\"_blank\" rel=\"noreferrer noopener\">olivier.dulieu_at_universite-paris-saclay.fr<\/a><br><br><\/li>\n\n\n\n<li style=\"font-size:16px\">L. WIESENFELD<br><a href=\"mailto:romain.vexiau@universite-paris-saclay.fr\" target=\"_blank\" rel=\"noreferrer noopener\">laurent.wiesenfeld_at_universite-paris-saclay.fr<\/a><br><br><\/li>\n\n\n\n<li style=\"font-size:16px\">F. CARLIER<br><a href=\"mailto:anne.crubellier@universite-paris-saclay.fr\" target=\"_blank\" rel=\"noreferrer noopener\">frederic.carlier_at_universite-paris-saclay.fr<\/a><br><br><\/li>\n\n\n\n<li style=\"font-size:16px\">E. LUC<br><a href=\"mailto:eliane.luc@universite-paris-saclay.fr\" target=\"_blank\" rel=\"noreferrer noopener\">eliane.luc_at_universite-paris-saclay.fr<\/a><\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n\n<div style=\"gap: 20px;\" class=\"align-button-center ub-buttons orientation-button-row ub-flex-wrap wp-block-ub-button\" id=\"ub-button-16f463fa-e4f4-40de-b9b9-cf5c55e6c71b\"><div class=\"ub-button-container\">\n\t\t\t<a href=\"?page_id=779\" target=\"_self\" rel=\"nofollow\" class=\"ub-button-block-main  \" role=\"button\" style=\"--ub-button-background-color: transparent; --ub-button-color: #7797b1; --ub-button-border: 3px solid #7797b1; --ub-button-hover-color: #2e5473; --ub-button-hover-border: 3px solid #2e5473; padding-top: 10px; padding-right: 10px; padding-bottom: 10px; padding-left: 10px; border-top-left-radius: 60px;; border-top-right-radius: 60px;; border-bottom-left-radius: 60px;; border-bottom-right-radius: 60px;; \">\n\t\t\t\t<div class=\"ub-button-content-holder\" style=\"flex-direction: row\">\n\t\t\t\t\t<span class=\"ub-button-block-btn\">Retour<\/span>\n\t\t\t\t<\/div>\n\t\t\t<\/a>\n\t\t<\/div><\/div>","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":2216,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1107","page","type-page","status-publish","has-post-thumbnail","hentry"],"featured_image_src":"http:\/\/www.lac.universite-paris-saclay.fr\/wp-content\/uploads\/2021\/08\/nadia-1.png","yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - 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