R
R. A. Costa Fraga
Researcher at Goethe University Frankfurt
Publications - 10
Citations - 349
R. A. Costa Fraga is an academic researcher from Goethe University Frankfurt. The author has contributed to research in topics: Electron & Laser. The author has an hindex of 7, co-authored 10 publications receiving 302 citations.
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Journal ArticleDOI
The Simplest Double Slit: Interference and Entanglement in Double Photoionization of H2
D. Akoury,K. Kreidi,Till Jahnke,Th. Weber,André Staudte,Markus Schöffler,N. Neumann,J. Titze,L. Ph. H. Schmidt,Achim Czasch,Ottmar Jagutzki,R. A. Costa Fraga,Robert E. Grisenti,R. Díez Muiño,N. A. Cherepkov,S. K. Semenov,Predrag Ranitovic,C. L. Cocke,Timur Osipov,Hidehito Adaniya,J. C. Thompson,M. H. Prior,Ali Belkacem,A. L. Landers,Horst Schmidt-Böcking,Reinhard Dörner +25 more
TL;DR: It is shown that a photoelectron and two protons form a minimum particle/slit system and that a single additional electron constitutes a minimum environment and that interference fringes observed in the angular distribution of a single electron are lost through its Coulomb interaction with a second electron.
Journal ArticleDOI
Interference in the collective electron momentum in double photoionization of H2.
K. Kreidi,D. Akoury,D. Akoury,Till Jahnke,Th. Weber,André Staudte,André Staudte,Markus Schöffler,N. Neumann,J. Titze,L. Ph. H. Schmidt,Achim Czasch,Ottmar Jagutzki,R. A. Costa Fraga,Robert E. Grisenti,M. Smolarski,Predrag Ranitovic,C. L. Cocke,Timur Osipov,Hidehito Adaniya,J. C. Thompson,M. H. Prior,Ali Belkacem,Allen Landers,Horst Schmidt-Böcking,R. Dörner +25 more
TL;DR: A double slitlike interference pattern is found in the sum momentum of both electrons in the molecular frame which survives integration over all other degrees of freedom and is shown to results from a non-Heitler-London fraction of the H(2) ground state.
Journal ArticleDOI
Cryogenic microjet for exploration of superfluidity in highly supercooled molecular hydrogen
TL;DR: In this paper, a new approach to produce a sample of supercooled molecular para-hydrogen (pH2) at temperatures down to 1.3 K, well below the predicted superfluid transition temperature for pH2.
Journal ArticleDOI
Photo-double-ionization of H 2 : Two-center interference and its dependence on the internuclear distance
Markus Schöffler,K. Kreidi,D. Akoury,D. Akoury,Till Jahnke,André Staudte,N. Neumann,J. Titze,L. Ph. H. Schmidt,Achim Czasch,Ottmar Jagutzki,R. A. Costa Fraga,Robert E. Grisenti,M. Smolarski,Predrag Ranitovic,C. L. Cocke,Timur Osipov,Hidehito Adaniya,S. Lee,J. C. Thompson,M. H. Prior,Ali Belkacem,Th. Weber,Allen Landers,Horst Schmidt-Böcking,Reinhard Dörner +25 more
TL;DR: In this article, photo-double-ionization of H 2 by circular polarized photons was investigated and the previously observed two-center interference pattern in the angular distribution of the electron sum momentum was shown to depend strongly on the internuclear distance and the summed electron momenta.
Journal ArticleDOI
Efficient Laser-Driven Proton Acceleration from a Cryogenic Solid Hydrogen Target
J. Polz,Alexander Robinson,A. Kalinin,G. A. Becker,R. A. Costa Fraga,M. Hellwing,Marco Hornung,Sebastian Keppler,Sebastian Keppler,Alexander Kessler,Diethard Klöpfel,Hartmut Liebetrau,Frank Schorcht,Joachim Hein,Joachim Hein,Matthew Zepf,Matthew Zepf,Matthew Zepf,Robert E. Grisenti,Malte C. Kaluza,Malte C. Kaluza +20 more
TL;DR: Two-dimensional particle-in-cell simulations confirm the results indicating that the spectral modulations are caused by collisionless shocks launched from the surface of the the high-density filament into a low-density corona surrounding the target.