{"id":48523,"date":"2020-12-23T13:51:13","date_gmt":"2020-12-23T12:51:13","guid":{"rendered":"https:\/\/aktuelles.uni-frankfurt.de\/?p=48523"},"modified":"2023-02-21T15:47:46","modified_gmt":"2023-02-21T14:47:46","slug":"quantum-wave-in-helium-dimer-filmed-for-the-first-time","status":"publish","type":"post","link":"https:\/\/aktuelles.uni-frankfurt.de\/en\/english\/quantum-wave-in-helium-dimer-filmed-for-the-first-time\/","title":{"rendered":"Quantum wave in helium dimer filmed for the first time"},"content":{"rendered":"<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"650\" height=\"450\" src=\"https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2020\/12\/beitragsbild_Kunitski-Doerner-Apparatur.jpg\" alt=\"\" class=\"wp-image-48514\" srcset=\"https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2020\/12\/beitragsbild_Kunitski-Doerner-Apparatur.jpg 650w, https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2020\/12\/beitragsbild_Kunitski-Doerner-Apparatur-300x208.jpg 300w\" sizes=\"(max-width: 650px) 100vw, 650px\" \/><figcaption><em>Professor Reinhard D\u00f6rner (left) and Dr Maksim Kunitzki in front of the COLTRIMS reaction microscope at Goethe University, which was used to observe the quantum wave. (Photo: Goethe University Frankfurt)<\/em><\/figcaption><\/figure><\/div>\n\n\n\n<p><strong>For the first time, an international team of scientists from Goethe University and the University of Oklahoma has succeeded in filming quantum physical effects on a helium dimer as it breaks apart. The film shows the superposition of matter waves from two simultaneous events that occur with different probability: The survival and the disintegration of the helium dimer. This method might in future make it possible to track experimentally the formation and decay of quantum Efimov systems.<\/strong><\/p>\n\n\n\n<p>Anyone entering the world of quantum physics must prepare themself for quite a few things unknown in the everyday world: Noble gases form compounds, atoms behave like particles and waves at the same time and events that in the macroscopic world exclude each other occur simultaneously.<\/p>\n\n\n\n<p>In the world of quantum physics, Reinhard\nD\u00f6rner and his team are working with molecules which \u2013 in the sense of most\ntextbooks \u2013 ought not to exist: Helium compounds with two atoms, known as helium\ndimers. Helium is called a noble gase precisely because it does not form any\ncompounds. However, if the gas is cooled down to just 10 degrees above absolute\nzero (minus 273 \u00b0C) and then pumped through a small nozzle into a vacuum\nchamber, which makes it even colder, then \u2013 very rarely \u2013 such helium dimers\nform. These are unrivaledly the weakest bound stable molecules in the Universe,\nand the two atoms in the molecule are correspondingly extremely far apart from\neach other. While a chemical compound of two atoms commonly measures about 1\nangstrom (0.1 nanometres), helium dimers on average measure 50 times as much,\ni.e. 52 angstrom.<\/p>\n\n\n\n<p>The scientists in Frankfurt irradiated\nsuch helium dimers with an extremely powerful laser flash, which slightly\ntwisted the bond between the two helium atoms. This was enough to make the two\natoms fly apart. They then saw \u2013 for the very first time \u2013 the helium atom\nflying away as a wave and record it on film.<\/p>\n\n\n\n<p>According to quantum physics, objects\nbehave like a particle and a wave at the same time, something that is best\nknown from light particles (photons), which on the one hand superimpose like\nwaves where they can pile upor extinguish each other (interference), but on the\nother hand as \u201csolar wind\u201d can propel spacecraft via their solar sails, for\nexample. <\/p>\n\n\n\n<p>That the researchers were able to observe\nand film the helium atom flying away as a wave at all in their laser experiment\nwas due to the fact that the helium atom only flew away with a certain\nprobability: With 98 per cent probability it was still bound to its second\nhelium partner, with 2 per cent probability it flew away. These two helium atom waves \u2013 Here it comes! Quantum\nphysics! \u2013 superimpose and their interference could be measured.<\/p>\n\n\n\n<p>The measurement of such \u201cquantum waves\u201d\ncan be extended to quantum systems with several partners, such as the helium\ntrimer composed of three helium atoms. The helium trimer is interesting because\nit can form what is referred to as an \u201cexotic Efimov state\u201d, says Maksim\nKunitski, first author of the study: \u201cSuch three-particle systems were\npredicted by Russian theorist Vitaly Efimov in 1970 and first corroborated on\ncaesium atoms. Five years ago, we discovered the Efimov state in the helium\ntrimer. The laser pulse irradiation method we\u2019ve now developed might allow us\nin future to observe the formation and decay of Efimov systems and thus better\nunderstand quantum physical systems that are difficult to access\nexperimentally.\u201d<\/p>\n\n\n\n<p class=\"has-background has-very-light-gray-background-color\"><strong>Publication:\n<\/strong>Maksim Kunitski, Qingze Guan, Holger\nMaschkiwitz, J\u00f6rg Hahnenbruch, Sebastian Eckart, Stefan Zeller, Anton Kalinin,\nMarkus Sch\u00f6ffler, Lothar Ph. H. Schmidt, Till Jahnke, D\u00f6rte Blume, Reinhard\nD\u00f6rner: <strong>Ultrafast manipulation of the\nweakly bound helium dimer<\/strong>. In: Nature Physics, <a href=\"https:\/\/doi.org\/10.1038\/s41567-020-01081-3\">https:\/\/doi.org\/10.1038\/s41567-020-01081-3<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>For the first time, an international team of scientists from Goethe University and the University of Oklahoma has succeeded in filming quantum physical effects on a helium dimer as it [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":48514,"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-48523","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 - 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