{"id":12792,"date":"2016-12-07T10:50:25","date_gmt":"2016-12-07T09:50:25","guid":{"rendered":"http:\/\/aktuelles.uni-frankfurt.de\/?p=12792"},"modified":"2023-02-22T15:56:42","modified_gmt":"2023-02-22T14:56:42","slug":"partnership-at-a-distance-deep-frozen-helium-molecules","status":"publish","type":"post","link":"https:\/\/aktuelles.uni-frankfurt.de\/en\/english\/partnership-at-a-distance-deep-frozen-helium-molecules\/","title":{"rendered":"Partnership at a distance: Deep-frozen helium molecules"},"content":{"rendered":"<figure id=\"attachment_12795\" aria-describedby=\"caption-attachment-12795\" style=\"width: 350px\" class=\"wp-caption alignleft\"><img fetchpriority=\"high\" decoding=\"async\" class=\"wp-image-12795\" src=\"https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2017\/01\/Helium-Molek\u00fcle.jpg\" alt=\"\u201cWhen two loners are forced to share a bed, they move well beyond its edges to get away from each other.\u201d\" width=\"350\" height=\"242\" srcset=\"https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2017\/01\/Helium-Molek\u00fcle.jpg 650w, https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2017\/01\/Helium-Molek\u00fcle-300x208.jpg 300w\" sizes=\"(max-width: 350px) 100vw, 350px\" \/><figcaption id=\"caption-attachment-12795\" class=\"wp-caption-text\">\u201cWhen two loners are forced to share a bed, they move well beyond its edges to get away from each other.\u201d<\/figcaption><\/figure>\n<p>Helium atoms are loners. Only if they are cooled down to an extremely low temperature do they form a very weakly bound molecule. In so doing, they can keep a tremendous distance from each other thanks to the quantum-mechanical tunnel effect. As atomic physicists in Frankfurt have now been able to confirm, over 75 percent of the time they are so far apart that their bond can be explained only by the quantum-mechanical tunnel effect.<\/p>\n<p>The binding energy in the helium molecule amounts to only about a billionth of the binding energy in everyday molecules such as oxygen or nitrogen. In addition, the molecule is so huge that small viruses or soot particles could fly between the atoms. This is due, physicists explain, to the quantum-mechanical \u201ctunnel effect\u201d. They use a potential well to illustrate the bond in a conventional molecule. The atoms cannot move further away from each other than the \u201cwalls\u201d of this well. However, in quantum mechanics the atoms can tunnel into the walls. \u201cIt\u2019s as if two people each dig a tunnel on their own side with no exit\u201d, explains <a href=\"http:\/\/www.atom.uni-frankfurt.de\/\" target=\"_blank\" rel=\"noopener\">Professor Reinhard D\u00f6rner of the Institute of Nuclear Physics<\/a> at Goethe University Frankfurt.<\/p>\n<p>D\u00f6rner\u2019s research group has produced this helium molecule in the laboratory and studied it with the help of the COLTRIMS reaction microscope developed at the University. The researchers were able to determine the strength of the bond with a level of precision not previously achieved and measured the distance between the two atoms in the molecule. \u201cThe helium molecule is something of a touchstone for quantum-mechanical theories, as the value of the binding energy theoretically predicted is heavily dependent on how accurately all physical and quantum-mechanical effects were taken into account\u201d, explains D\u00f6rner.<\/p>\n<figure id=\"attachment_10843\" aria-describedby=\"caption-attachment-10843\" style=\"width: 750px\" class=\"wp-caption alignleft\"><img decoding=\"async\" class=\"size-full wp-image-10843\" src=\"https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2016\/11\/blog_Gruppenfoto-AG-Doerner.jpg\" alt=\"Ein Teil des Teams, das die Messungen durchf\u00fchrte. Von rechts nach links: Till Jahnke, Stefan Zeller, Markus Sch\u00f6ffler, Christian Janke, Martin Richter, Maksim Kunitski, Alexander Hartung Foto: Janine Gatzke\" width=\"750\" height=\"350\" srcset=\"https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2016\/11\/blog_Gruppenfoto-AG-Doerner.jpg 750w, https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2016\/11\/blog_Gruppenfoto-AG-Doerner-300x140.jpg 300w\" sizes=\"(max-width: 750px) 100vw, 750px\" \/><figcaption id=\"caption-attachment-10843\" class=\"wp-caption-text\">D\u00f6rner&#8217;s research group: Till Jahnke, Stefan Zeller, Markus Sch\u00f6ffler, Christian Janke, Martin Richter, Maksim Kunitski, Alexander Hartung; photo: Janine Gatzke<\/figcaption><\/figure>\n<p>Even the theory of relativity, which is otherwise mainly required for astronomical calculations, had to be incorporated here. \u201cIf even just a small mistake occurs, the calculations produce major deviations or even indicate that a helium molecule cannot exist at all\u201d, says D\u00f6rner. The precision measurements performed by his research group will serve as a benchmark for future experiments.<\/p>\n<h3>Two years spent taking measurements in the cellar<\/h3>\n<p>D\u00f6rner\u2019s research group began investigating the helium molecule back in 2009, when the German Research Foundation awarded him a Reinhart Koselleck Project and funding to the tune of \u20ac 1.25 million. \u201cThis type of funding is risk capital, as it were, with which the German Research Foundation supports experiments with a long lead time\u201d, explains D\u00f6rner. He was thus able to design and set up the first experiments with his group. Initial results were achieved by Dr. J\u00f6rg Voigtsberger in the framework of his doctoral dissertation. \u201cIn the search for atoms which \u2018live in the tunnel\u2019, J\u00f6rg Voigtsberger spent two years of his life in the cellar\u201d, recalls Dr. Till Jahnke, senior lecturer and Voigtberger\u2019s supervisor at the time. It is there, in the cellar, that the laser laboratory of the atomic physics group is housed.<\/p>\n<p>Stefan Zeller, the next doctoral researcher, considerably improved the equipment with the help of Dr. Maksim Kunitski and increased measurement precision still further. To do so, one of his tasks was to shoot at the very weakly bonded helium molecule with FLASH, the free-electron laser at the DESY research centre in Hamburg and the largest &#8222;photon canon&#8220; in Germany. \u201cStefan Zeller\u2019s work was remarkable. It was his untiring effort, his excellent experimental research skills and his ability not to be disheartened by temporary setbacks which made our success possible at all\u201d, remarks Professor D\u00f6rner, Zeller\u2019s doctoral supervisor.<\/p>\n<p>Already beforehand the results have attracted considerable interest at national and international level. They will now appear in the renowned journal \u201cProceedings of the National Academy of Sciences of the United States of America (PNAS)\u201d and are also part of the research work for which the group was awarded the Helmholtz Prize 2016.<\/p>\n<p>[dt_call_to_action content_size=&#8220;small&#8220; background=&#8220;fancy&#8220; line=&#8220;true&#8220; animation=&#8220;fadeIn&#8220;]<\/p>\n<p><a href=\"http:\/\/www.pnas.org\/content\/113\/51\/14651.abstract\" target=\"_blank\" rel=\"noopener\"><strong>Publication<\/strong><\/a><\/p>\n<p>S. Zeller, M. Kunitski, J. Voigtsberger, A. Kalinin, A. Schottelius, C. Schober, M. Waitz, H. Sann, A. Hartung, T. Bauer, M. Pitzer, F. Trinter, C. Goihl, C. Janke, M. Richter, G. Kastirke, M. Weller, A. Czasch, M. Kitzler, M. Braune, R. E. Grisenti, W. Sch\u00f6llkopf, L. Ph. H. Schmidt, M. Sch\u00f6ffler, J. B. Williams, T. Jahnke, and R. D\u00f6rner:<\/p>\n<p>Imaging the He2 quantum halo state using a free electron laser, in: PNAS, DOI<br \/>\n[\/dt_call_to_action]<\/p>\n<p><em><strong>Source: <a href=\"http:\/\/www.goethe-university-frankfurt.de\/64324515\/43\" target=\"_blank\" rel=\"noopener\">Press Release 07\/12\/16<\/a><\/strong><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Helium atoms are loners. Only if they are cooled down to an extremely low temperature do they form a very weakly bound molecule. In so doing, they can keep a [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":12795,"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-12792","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>Partnership at a distance: Deep-frozen helium molecules | 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\/partnership-at-a-distance-deep-frozen-helium-molecules\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Partnership at a distance: Deep-frozen helium molecules | Aktuelles aus der Goethe-Universit\u00e4t Frankfurt\" \/>\n<meta property=\"og:description\" content=\"Helium atoms are loners. 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