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Das Heliumdimer He2 ist das im Grundzustand am schwächsten gebundene, bekannte Molekül. Dass es ohne zu zerbrechen von einer Wand zurückprallt, widerspricht den Gesetzen der klassischen Physik. Ein Experiment am Fritz‐Haber‐Institut der Max‐Planck‐Gesellschaft hat nun gezeigt, dass Heliumdimere durchaus zerstörungsfrei zurückgestreut werden können. Die Erklärung liegt in der Quantenreflexion, die...
A photon as a particle has an energy and a momentum. In a matter–photon interaction, the matter and photons may exchange their momenta observing the momentum conservation law. The consequence of the momentum transfer from a photon to a matter particle is a mechanical force exerted on the particle. Several separation methods based on this force of light are reviewed. Photophoresis separations for micron-sized...
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