학술논문
Double Core-Hole Generation in O2 Molecules Using an X-Ray Free-Electron Laser: Molecular-Frame Photoelectron Angular Distributions
Document Type
article
Author
Kastirke, Gregor; Schöffler, Markus S; Weller, Miriam; Rist, Jonas; Boll, Rebecca; Anders, Nils; Baumann, Thomas M; Eckart, Sebastian; Erk, Benjamin; De Fanis, Alberto; Fehre, Kilian; Gatton, Averell; Grundmann, Sven; Grychtol, Patrik; Hartung, Alexander; Hofmann, Max; Ilchen, Markus; Janke, Christian; Kircher, Max; Kunitski, Maksim; Li, Xiang; Mazza, Tommaso; Melzer, Niklas; Montano, Jacobo; Music, Valerija; Nalin, Giammarco; Ovcharenko, Yevheniy; Pier, Andreas; Rennhack, Nils; Rivas, Daniel E; Dörner, Reinhard; Rolles, Daniel; Rudenko, Artem; Schmidt, Philipp; Siebert, Juliane; Strenger, Nico; Trabert, Daniel; Vela-Perez, Isabel; Wagner, Rene; Weber, Thorsten; Williams, Joshua B; Ziolkowski, Pawel; Schmidt, Lothar Ph H; Czasch, Achim; Ueda, Kiyoshi; Trinter, Florian; Meyer, Michael; Demekhin, Philipp V; Jahnke, Till
Source
Physical Review Letters. 125(16)
Subject
Language
Abstract
We report on a multiparticle coincidence experiment performed at the European X-ray Free-Electron Laser at the Small Quantum Systems instrument using a COLTRIMS reaction microscope. By measuring two ions and two electrons in coincidence, we investigate double core-hole generation in O_{2} molecules in the gas phase. Single-site and two-site double core holes have been identified and their molecular-frame electron angular distributions have been obtained for a breakup of the oxygen molecule into two doubly charged ions. The measured distributions are compared to results of calculations performed within the frozen- and relaxed-core Hartree-Fock approximations.