title: Identification of absolute geometries of cis and trans molecular isomers by Coulomb Explosion Imaging.
abstract: An experimental route to identify and separate geometric isomers by means of coincident Coulomb explosion imaging is presented, allowing isomer-resolved photoionization studies on isomerically mixed samples. We demonstrate the technique on cis/trans 1,2-dibromoethene (C2H2Br2). The momentum correlation between the bromine ions in a three-body fragmentation process induced by bromine 3d inner-shell photoionization is used to identify the cis and trans structures of the isomers. The experimentally determined momentum correlations and the isomer-resolved fragment-ion kinetic energies are matched closely by a classical Coulomb explosion model.
authors.affiliation: J. R. Macdonald Laboratory, Physics Dept., Kansas State University, Manhattan, KS 66506, USA.
authors.forename: Utuq
authors.initials: U
authors.lastname: Ablikim
authors.affiliation: Deutsches Elektronen-Synchrotron (DESY), 22607, Hamburg, Germany.
authors.forename: Cédric
authors.initials: C
authors.lastname: Bomme
authors.affiliation: Department of Physics, University of Connecticut, Storrs, CT 06269, USA.
authors.forename: Hui
authors.initials: H
authors.lastname: Xiong
authors.affiliation: Deutsches Elektronen-Synchrotron (DESY), 22607, Hamburg, Germany.
authors.forename: Evgeny
authors.initials: E
authors.lastname: Savelyev
authors.affiliation: Department of Physics, University of Connecticut, Storrs, CT 06269, USA.
authors.forename: Razib
authors.initials: R
authors.lastname: Obaid
authors.affiliation: J. R. Macdonald Laboratory, Physics Dept., Kansas State University, Manhattan, KS 66506, USA.
authors.forename: Balram
authors.initials: B
authors.lastname: Kaderiya
authors.affiliation: J. R. Macdonald Laboratory, Physics Dept., Kansas State University, Manhattan, KS 66506, USA.|Max Planck Institute for Nuclear Physics, 69117 Heidelberg, Germany.
authors.forename: Sven
authors.initials: S
authors.lastname: Augustin
authors.affiliation: Max Planck Institute for Nuclear Physics, 69117 Heidelberg, Germany.|Department of Chemistry, University of California, Berkeley, CA 94720, USA.
authors.forename: Kirsten
authors.initials: K
authors.lastname: Schnorr
authors.affiliation: Hobart and William Smith Colleges, Geneva, NY 14456, USA.
authors.forename: Ileana
authors.initials: I
authors.lastname: Dumitriu
authors.affiliation: SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA.
authors.forename: Timur
authors.initials: T
authors.lastname: Osipov
authors.affiliation: Department of Physics, University of Connecticut, Storrs, CT 06269, USA.|Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
authors.forename: René
authors.initials: R
authors.lastname: Bilodeau
authors.affiliation: Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
authors.forename: David
authors.initials: D
authors.lastname: Kilcoyne
authors.affiliation: J. R. Macdonald Laboratory, Physics Dept., Kansas State University, Manhattan, KS 66506, USA.
authors.forename: Vinod
authors.initials: V
authors.lastname: Kumarappan
authors.affiliation: J. R. Macdonald Laboratory, Physics Dept., Kansas State University, Manhattan, KS 66506, USA.
authors.forename: Artem
authors.initials: A
authors.lastname: Rudenko
authors.affiliation: Department of Physics, University of Connecticut, Storrs, CT 06269, USA.
authors.forename: Nora
authors.initials: N
authors.lastname: Berrah
authors.affiliation: J. R. Macdonald Laboratory, Physics Dept., Kansas State University, Manhattan, KS 66506, USA.|Deutsches Elektronen-Synchrotron (DESY), 22607, Hamburg, Germany.
authors.forename: Daniel
authors.initials: D
authors.lastname: Rolles