Ejection of quasi-free-electron pairs from the helium-atom ground state by single-photon absorption

Schöffler, M SStuck, CWaitz, MTrinter, FJahnke, T.Lenz, UJones, MBelkacem, ALanders, A LPindzola, M.S.Cocke, C LColgan, J.Kheifets, AnatoliBray, IgorSchmidt-Böcking, HDorner, RWeber, Th2015-12-130031-9007http://hdl.handle.net/1885/73255We investigate the single-photon double ionization of helium at photon energies of 440 and 800 eV. We observe doubly charged ions with close to zero momentum corresponding to electrons emitted back to back with equal energy. These slow ions are the uniqueAuthor/s retain copyrightKeywords: Convergent close couplings; Double ionization mechanisms; Doubly charged ions; Electromagnetic interactions; Experimental datum; Single-photon absorptions; Single-photon double ionization; Time-dependent close-coupling methods; Helium; Photons; PhotoionizEjection of quasi-free-electron pairs from the helium-atom ground state by single-photon absorption201310.1103/PhysRevLett.111.0130032016-02-24