Organisateurs: Christelle Bruni (CNRS/Université Paris Saclay, bruni@ijclab.in2p3.fr), Marc Simon (Sorbonne université, marc.simon@upmc.fr), Geneviève Loupias (Sorbonne Université, genevieve.loupias@upmc.fr), Fabrice Catoire (Université de Bordeaux, fabrice.catoire@u-bordeaux.fr), Andrew Mayne (Université Paris Saclay, andrew.mayne@u-psud.fr) |
Division Physique Atomique et Moléculaire Optique, Division Accélérateurs |
Horaires: lundi 16h45 Salle Cécile DeWitt-Morette
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Il y a 100 ans, en 1923, Arthur Compton expliqua l’allongement de la longueur d’onde des photons X ou gamma qu’il avait observé lors de leur diffusion par des cibles variées. Pour ce faire, il utilisa l’aspect corpusculaire de la lumière, apportant ainsi une preuve expérimentale à la dualité onde-corpuscule introduite par Planck et Einstein dans les années 1900.
100 years ago, in 1923, Arthur Compton explained the lengthening wavelengths of X-ray and gamma-ray photons he had observed being scattered by a variety of targets. To do this, he used the corpuscular aspect of light, providing experimental proof of the wave-corpuscle duality introduced by Planck and Einstein in the 1900s. He imagined the inelastic scattering of incident photons by electrons engaged in the target, and thus determined the lengthening of photon wavelengths [the so-called "Compton shift": Nobel Prize 1927]. In addition to its fundamental role in highlighting the corpuscular nature of light, the Compton effect is widely used to probe matter, and is proving indispensable in medicine in particular. Thanks to the increased performance of particle accelerators and lasers, it is also the basis for new sources of intense, monochromatic X-rays. More recently, non-linear effects induced by intense and brief UV or X-ray fields obtained by X-ray Free Electron Lasers (XFEL) have made it possible to revisit the Compton effect, opening up new perspectives. Finally, the Compton effect is also widely used in astrophysics and cosmology, either for observation (Compton telescope), or by generating distortions to probe the Universe. These various themes surrounding the Compton effect have been addressed during this mini symposium. |