{"id":44748,"date":"2020-06-17T08:56:19","date_gmt":"2020-06-17T06:56:19","guid":{"rendered":"https:\/\/aktuelles.uni-frankfurt.de\/?p=44748"},"modified":"2023-02-22T14:08:13","modified_gmt":"2023-02-22T13:08:13","slug":"atomic-physics-radiation-pressure-with-recoil","status":"publish","type":"post","link":"https:\/\/aktuelles.uni-frankfurt.de\/en\/english\/atomic-physics-radiation-pressure-with-recoil\/","title":{"rendered":"Atomic physics: radiation pressure with recoil"},"content":{"rendered":"<div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2020\/06\/beitragsbild_atomphysik_doerner.jpg\" alt=\"\" class=\"wp-image-44741\" width=\"498\" height=\"344\" srcset=\"https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2020\/06\/beitragsbild_atomphysik_doerner.jpg 650w, https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2020\/06\/beitragsbild_atomphysik_doerner-300x208.jpg 300w\" sizes=\"(max-width: 498px) 100vw, 498px\" \/><figcaption> <em>Andrzej Mirecki \/ <\/em><br><em>CC BY-SA (https:\/\/creativecommons.org\/licenses\/by-sa\/3.0)<\/em> <\/figcaption><\/figure><\/div>\n\n\n\n<p>Light exerts a certain amount of pressure onto a body: sun sails could thus power space probes in the future. However, when light particles (photons) hit an individual molecule and knock out an electron, the molecule flies toward the light source. Atomic physicists at Goethe University have now observed this for the first time, confirming a 90 year-old theory. <\/p>\n\n\n\n<p>As early as the 16<sup>th<\/sup> century, the great scholar Johannes Kepler postulated that sunlight exerted a certain pressure, as the tail of the comets he observed consistently pointed away from the sun. In 2010 the Japanese space probe Ikaros used a sun sail for the first time in order to use the power of sunlight to gain a little speed. <\/p>\n\n\n\n<p>Physically and intuitively, the pressure\nof light or radiation can be explained by the particle characteristic of light:\nlight particles (photons) strike the atoms of a body and transfer a portion of their\nown momentum (mass times speed) onto that body, which\nthus becomes faster.<\/p>\n\n\n\n<p>However, when in the 20<sup>th<\/sup>\ncentury physicists studied this momentum transfer in the laboratory during\nexperiments on photons of certain wavelengths which knocked individual\nelectrons out of atoms, they were met by a surprising phenomenon: the momentum of\nthe ejected electron was greater than that of the photon that struck it. This\nis actually impossible \u2013 since Isaac Newton it has been known that within a\nsystem, for every force there must exist an equal but opposite force: the\nrecoil, so to speak. For this reason, the Munich scientist Arnold Sommerfeld\nconcluded in 1930 that the additional momentum of the ejected electron must\ncome from the atom it left. This atom must fly in the opposite direction; in\nother words, toward the light source. However, this was impossible to measure with\nthe instruments available at that time.<\/p>\n\n\n\n<p>Ninety years later the physicists in the\nteam of doctoral student Sven Grundmann and Professor Reinhard D\u00f6rner from the\nInstitute for Nuclear Physics have succeeded for the first time in measuring\nthis effect using the COLTRIMS reaction microscope developed at Goethe\nUniversity Frankfurt. To do so, they used X-rays at the accelerators DESY in\nHamburg and ESRF in French Grenoble, in order to knock electrons out of helium\nand nitrogen molecules. They selected conditions that would require only one\nphoton per electron. In the COLTRIMS reaction microscope, they were able to\ndetermine the momentum of the ejected electrons and the charged helium and\nnitrogen atoms \u2013 which are called ions \u2013 with unprecedented precision.<\/p>\n\n\n\n<p>Professor Reinhard D\u00f6rner explains: \u201cWe were not only able to measure the ion\u2019s momentum, but also see where it came from \u2013 namely, from the recoil of the ejected electron. If photons in these collision experiments have low energy, the photon momentum can be neglected for theoretical modelling. With high photon energies, however, this leads to imprecision. In our experiments, we have now succeeded in determining the energy threshold for when the photon momentum may no longer be neglected. Our experimental breakthrough allows us to now pose many more questions, such as what changes when the energy is distributed between two or more photons.\u201d<\/p>\n\n\n\n<p class=\"has-background has-very-light-gray-background-color\"><strong>Publication: <\/strong>Sven Grundmann, Max Kircher, Isabel Vela-Perez, Giammarco Nalin, Daniel Trabert, Nils Anders, Niklas Melzer, Jonas Rist, Andreas Pier, Nico Strenger, Juliane Siebert, Philipp V. Demekhin, Lothar Ph. H. Schmidt, Florian Trinter, Markus S. Sch\u00f6ffler, Till Jahnke, and Reinhard D\u00f6rner: <strong>Observation of Photoion Backward Emission in Photoionization of He and N2<\/strong>. Phys. Rev. Lett. 124, 233201 <a href=\"https:\/\/doi.org\/10.1103\/PhysRevLett.124.233201\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"https:\/\/doi.org\/10.1103\/PhysRevLett.124.233201 (\u00f6ffnet in einem neuem Tab)\">https:\/\/doi.org\/10.1103\/PhysRevLett.124.233201<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Light exerts a certain amount of pressure onto a body: sun sails could thus power space probes in the future. However, when light particles (photons) hit an individual molecule and [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":44741,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"footnotes":""},"categories":[126,254],"tags":[242],"post_folder":[],"class_list":["post-44748","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-english","category-research","tag-physics"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Atomic physics: radiation pressure with recoil | Aktuelles aus der Goethe-Universit\u00e4t Frankfurt<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/aktuelles.uni-frankfurt.de\/en\/english\/atomic-physics-radiation-pressure-with-recoil\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Atomic physics: radiation pressure with recoil | Aktuelles aus der Goethe-Universit\u00e4t Frankfurt\" \/>\n<meta property=\"og:description\" content=\"Light exerts a certain amount of pressure onto a body: sun sails could thus power space probes in the future. 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