Bond-rearrangement and ionization mechanisms in the photo-double-ionization of simple hydrocarbons (C2H4, C2H3F, and 1,1-C2H2F2) near and above threshold

Gaire, B.; Gatton, A. S.; Wiegandt, F.; Neff, J.; Janke, C.; Zeller, S.; Reedy, D.; Rajput, J.; Ben-Itzahk, I.; Landers, A. L.; Belkacem, A.; Weber, Th.

doi:10.1103/PhysRevA.94.033412

Title: Bond-rearrangement and ionization mechanisms in the photo-double-ionization of simple hydrocarbons (C₂H₄, C₂H₃F, and 1,1-C₂H₂F₂) near and above threshold

Journal Article · Wed Sep 14 00:00:00 EDT 2016 · Physical Review A

DOI:https://doi.org/10.1103/PhysRevA.94.033412· OSTI ID:1339563

Gaire, B. ^[1]; Gatton, A. S. ^[1]; Wiegandt, F. ^[2]; Neff, J. ^[2]; Janke, C. ^[3]; Zeller, S. ^[3]; Reedy, D. ^[4]; Rajput, J. ^[5]; Ben-Itzahk, I. ^[5]; Landers, A. L. ^[4]; Belkacem, A. ^[1]; Weber, Th. ^[1]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Goethe Univ., Frankfurt (Germany)
Goethe Univ., Frankfurt (Germany)
Auburn Univ., AL (United States)
Kansas State Univ., Manhattan, KS (United States)

We investigate bond-rearrangement driven by photo-double-ionization (PDI) near and above the double-ionization threshold in a sequence of carbon-carbon double-bonded hydrocarbon molecules: ethylene, fluoroethylene, and 1,1-difluoroethylene. We employ the kinematically complete cold target recoil ion momentum spectroscopy method to resolve all photo-double-ionization events leading to two-ion fragments. We observe changes in the branching ratios of different dissociative ionization channels depending on the presence of no, one, or two fluorine atoms. The role of the fluorine atom in the bond-rearrangement channels is intriguing, as evident by the reordering of the threshold energies of the PDI in the fluorinated molecules. These effects offer a compelling argument that the electronegativity of the fluorine (or the polarity of the molecule) strongly influences the potential energy surfaces of the molecules and drives bond rearrangement during the dissociation process. The energy sharing and the relative angle between the three-dimensional momentum vectors of the two electrons enable us to distinguish between knockout and other ionization mechanisms of the PDI processes.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231; FG02-86ER13491

OSTI ID:: 1339563

Alternate ID(s):: OSTI ID: 1324498; OSTI ID: 1377491

Report Number(s):: LBNL-1005182; ir:1005182; TRN: US1701640

Journal Information:: Physical Review A, Vol. 94; ISSN 2469-9926

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 2 works

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Title: Bond-rearrangement and ionization mechanisms in the photo-double-ionization of simple hydrocarbons (C₂H₄, C₂H₃F, and 1,1-C₂H₂F₂) near and above threshold