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Wie alle Edelgase hat Helium eine vollständig gefüllte Valenzelektronenschale und kann entsprechend keine kovalente Bindung eingehen. Unter extrem kalten Bedingungen genügt jedoch die äußerst schwache Van‐der‐Waals‐Wechselwirkung, um mehrere Heliumatome aneinander zu binden. Einer Gruppe von Atomphysikern der Goethe‐Universität Frankfurt ist es gelungen, diese Verbindungen herzustellen und zu vermessen...