{"id":1759,"date":"2017-02-28T09:16:04","date_gmt":"2017-02-28T09:16:04","guid":{"rendered":"https:\/\/www.kolabtree.com\/blog\/?p=1759"},"modified":"2018-02-26T13:09:04","modified_gmt":"2018-02-26T13:09:04","slug":"raman-krishnan-collaboration","status":"publish","type":"post","link":"https:\/\/www.kolabtree.com\/blog\/fr\/raman-krishnan-collaboration\/","title":{"rendered":"En souvenir de la collaboration Raman-Krishnan \u00e0 l'occasion de la Journ\u00e9e nationale de la science"},"content":{"rendered":"<p>Il y a 89 ans, un scientifique indien a d\u00e9couvert un ph\u00e9nom\u00e8ne qui allait changer la fa\u00e7on dont le monde comprenait la diffusion de la lumi\u00e8re. Pour cette d\u00e9couverte, il a re\u00e7u le prix Nobel de physique en 1930, \u00e9tant le premier Asiatique et non-blanc \u00e0 avoir re\u00e7u ce laurier.<\/p>\n<div>Ce ph\u00e9nom\u00e8ne est l'effet Raman et l'homme qui en est \u00e0 l'origine est C. V. Raman. L'effet Raman d\u00e9montre que les photons diffus\u00e9s n'ont pas n\u00e9cessairement la m\u00eame \u00e9nergie (fr\u00e9quence et longueur d'onde) que les photons incidents. Une certaine quantit\u00e9 d'\u00e9nergie est perdue lorsqu'un photon frappe un atome, et chaque atome ne peut contenir qu'une quantit\u00e9 sp\u00e9cifique d'\u00e9nergie. L'\u00e9tude des \u00e9nergies correspondant aux d\u00e9calages de fr\u00e9quence Raman permet d'identifier la composition et les propri\u00e9t\u00e9s des mat\u00e9riaux.<\/div>\n<div>\n<div><img decoding=\"async\" loading=\"lazy\" class=\"alignnone wp-image-1761 size-full\" src=\"https:\/\/www.kolabtree.com\/blog\/wp-content\/uploads\/2017\/02\/raman-krishnan.jpg\" alt=\"raman-krishnan\" width=\"480\" height=\"360\" srcset=\"https:\/\/www.kolabtree.com\/blog\/wp-content\/uploads\/2017\/02\/raman-krishnan.jpg 480w, https:\/\/www.kolabtree.com\/blog\/wp-content\/uploads\/2017\/02\/raman-krishnan-300x225.jpg 300w\" sizes=\"(max-width: 480px) 100vw, 480px\" \/><\/div>\n<div>C.V. Raman had one dedicated student and collaborator who helped his <a href=\"https:\/\/www.kolabtree.com\/blog\/fr\/ensuring-reproducibility-in-ai-driven-research-how-freelance-experts-can-help-in-biotech-and-healthcare\/\">recherche<\/a> realize success. \u00a0By his side was K. S. Krishnan, who contributed enormously to Raman&#8217;s studies and experiments. Krishnan, who was working in Madras Christian College, moved to Calcutta in 1920 to work with Raman. During the years 1925 to 1928, Krishnan authored singly or jointly 16 papers, under Raman&#8217;s tutelage. He was the one who first gave Raman a demonstration of the scattering. Between Feb 19th and 26th, 1928, Krishnan performed many experiments that proved the inelastic scattering of light. The discovery of the Raman effect was made jointly by Raman and Krishnan on February 28th, which is now celebrated as National Science Day.<\/div>\n<div><\/div>\n<div>Apr\u00e8s l'attribution du prix Nobel \u00e0 Raman en 1930, une vive controverse a eu lieu, laissant entendre que Krishnan n'avait pas re\u00e7u suffisamment de cr\u00e9dit pour sa contribution. Cependant, <a href=\"http:\/\/madrasmusings.com\/Vol%2022%20No%2022\/the-illustrious-scientist-who-teamed-with-cv-raman.html\">Krishnan a d\u00e9clar\u00e9 ceci<\/a>:<\/div>\n<div><\/div>\n<div>\"Si vous lisez la conf\u00e9rence Nobel, qui est un compte rendu v\u00e9ridique et honn\u00eate des progr\u00e8s et de l'histoire du sujet, le professeur nomme tous ses collaborateurs dans l'ordre en commen\u00e7ant par K. R. Ramanathan, donnant \u00e0 chacun (et y compris \u00e0 moi) le cr\u00e9dit qui lui revient. \u00c0 maintes reprises, lors de conf\u00e9rences publiques, il a toujours mentionn\u00e9 que j'avais collabor\u00e9 avec lui \u00e0 la d\u00e9couverte de l'effet et que notre collaboration \u00e9tait similaire \u00e0 celle de Bowen et Millikan, ce qui \u00e9tait un v\u00e9ritable \u00e9loge\".<\/div>\n<\/div>\n<div>Si C. V. Raman a fait une perc\u00e9e importante, rappelons \u00e9galement que sa d\u00e9couverte n'a pas \u00e9t\u00e9 faite par une seule personne. Elle est le fruit d'une collaboration entre deux scientifiques, le r\u00e9sultat de deux personnes qui ont mis en commun leurs t\u00eates, leurs comp\u00e9tences et leur expertise.<\/div>\n<div>\n<div>\u00c0 l'occasion de la Journ\u00e9e nationale de la science, nous vous souhaitons d'autres merveilleuses collaborations, d\u00e9couvertes et innovations !<\/div>\n<p>&nbsp;<\/p>\n<div><\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Il y a 89 ans, un scientifique indien a d\u00e9couvert un ph\u00e9nom\u00e8ne qui allait changer la fa\u00e7on dont le monde comprenait la diffusion de la lumi\u00e8re. Pour cette d\u00e9couverte, il a re\u00e7u le prix Nobel de physique en 1930, \u00e9tant le premier Asiatique et non-blanc \u00e0 avoir re\u00e7u ce laurier. Le ph\u00e9nom\u00e8ne \u00e9tait l'effet Raman et l'homme...<\/p>\n<div class=\"read-more\"><a href=\"https:\/\/www.kolabtree.com\/blog\/fr\/raman-krishnan-collaboration\/\" title=\"Lire la suite\">Lire la suite<\/a><\/div>","protected":false},"author":12,"featured_media":1766,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[305,314],"tags":[17,264,266,263,265],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.1 (Yoast SEO v20.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Remembering the Raman-Krishnan collaboration on National Science Day<\/title>\n<meta name=\"description\" content=\"C. V. Raman, the Indian scientist who won the Nobel Prize in Physics in 1930, collaborated with K. S. 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