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Experimental and theoretical investigation of the crossover from the ultracold to the quasiclassical regime of photodissociation

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cris.lastimport.scopus2024-02-12T20:41:55Z
dc.abstract.enAt ultralow energies, atoms and molecules undergo collisions and reactions that are best described in terms of quantum-mechanical wave functions. In contrast, at higher energies these processes can be understood quasiclassically. Here, we investigate the crossover from the quantum-mechanical to the quasiclassical regime both experimentally and theoretically for photodissociation of ultracold diatomic strontium molecules. This basic reaction is carried out with a full control of quantum states for the molecules and their photofragments. The photofragment angular distributions are imaged and calculated by using a quantum-mechanical model as well as the Wenzel–Kramers–Brillouin approximation and a semiclassical approximation that are explicitly compared across a range of photofragment energies. The reaction process is shown to converge to its highenergy (axial-recoil) limit when the energy exceeds the height of any reaction barriers. This phenomenon is quantitatively investigated for two-channel photodissociation by using intuitive parameters for the channel amplitude and phase. While the axial-recoil limit is generally found to be well described by a commonly used quasiclassical model, we find that when the photofragments are identical particles, their bosonic or fermionic quantum statistics can cause this model to fail, requiring a quantum-mechanical treatment even at high energies.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorMoszyński, Robert
dc.contributor.authorMajewska, Iwona
dc.contributor.authorKondov, S. S.
dc.contributor.authorMcDonald, M.
dc.contributor.authorLee, C.-H.
dc.contributor.authorZelevinsky, T.
dc.contributor.authorMcGuyer, B. H.
dc.date.accessioned2024-01-25T00:07:52Z
dc.date.available2024-01-25T00:07:52Z
dc.date.issued2018
dc.description.financeNie dotyczy
dc.description.number4
dc.description.volume98
dc.identifier.doi10.1103/PHYSREVA.98.043404
dc.identifier.issn2469-9926
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/106750
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofPhysical Review A
dc.relation.pages43404
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.titleExperimental and theoretical investigation of the crossover from the ultracold to the quasiclassical regime of photodissociation
dc.typeJournalArticle
dspace.entity.typePublication