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Open Access Publications from the University of California

Identification of absolute geometries of cis and trans molecular isomers by Coulomb Explosion Imaging.

  • Author(s): Ablikim, Utuq
  • Bomme, Cédric
  • Xiong, Hui
  • Savelyev, Evgeny
  • Obaid, Razib
  • Kaderiya, Balram
  • Augustin, Sven
  • Schnorr, Kirsten
  • Dumitriu, Ileana
  • Osipov, Timur
  • Bilodeau, René
  • Kilcoyne, David
  • Kumarappan, Vinod
  • Rudenko, Artem
  • Berrah, Nora
  • Rolles, Daniel
  • et al.

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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.

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