Einstein-Bohr recoiling double-slit gedanken experiment performed at the molecular level
2015 (English)In: Nature Photonics, ISSN 1749-4885, E-ISSN 1749-4893, Vol. 9, no 2, 120-125 p.Article in journal (Refereed) Published
Double-slit experiments illustrate the quintessential proof for wave-particle complementarity. If information is missing about which slit the particle has traversed, the particle, behaving as a wave, passes simultaneously through both slits. This wave-like behaviour and corresponding interference is absent if 'which-slit' information exists. The essence of Einstein-Bohr's debate about wave-particle duality was whether the momentum transfer between a particle and a recoiling slit could mark the path, thus destroying the interference. To measure the recoil of a slit, the slits should move independently. We showcase a materialization of this recoiling double-slit gedanken experiment by resonant X-ray photoemission from molecular oxygen for geometries near equilibrium (coupled slits) and in a dissociative state far away from equilibrium (decoupled slits). Interference is observed in the former case, while the electron momentum transfer quenches the interference in the latter case owing to Doppler labelling of the counter-propagating atomic slits, in full agreement with Bohr's complementarity.
Place, publisher, year, edition, pages
2015. Vol. 9, no 2, 120-125 p.
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:kth:diva-161619DOI: 10.1038/NPHOTON.2014.289ISI: 000349354300018ScopusID: 2-s2.0-84923071676OAI: oai:DiVA.org:kth-161619DiVA: diva2:797863
QC 201503252015-03-252015-03-132015-03-25Bibliographically approved