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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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