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Osipov, T.; Stener, Mauro; Belkacem, A.; Schöffler, M. S.; Weber, Thorsten; Schmidt, L. Ph. H.; Landers, A. L.; Prior, M. H.; Dørner, R.; Cocke, C. L.

doi:10.1103/physreva.81.033429

Cited by 7 publications

(6 citation statements)

References 24 publications

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“…The wide range of E Auger measured in our experiment (from about 250 to 268 eV) is an indication that all three different Auger decay mechanisms (i.e., DA, SA, and CA) introduced earlier play a role. Though we did not record photoelectrons in the current measurement, the kinetic energies of the photoelectrons from the K-shell ionization of ethylene molecules in a similar photon energy range are reported in the literature [52]. The reported photoelectron energy distribution in fact shows satellite lines in addition to the main line in Ref.…”

Section: A Energy Mapssupporting

confidence: 70%

“…The reported photoelectron energy distribution in fact shows satellite lines in addition to the main line in Ref. [52]; however, in that experiment the corresponding Auger electrons were not recorded. From these yields and our branching ratios we can deduce that for 310-eV photons the DA mechanism is likely to dominate.…”

Section: A Energy Mapsmentioning

confidence: 55%

“…Highly differential measurements have revealed an "f -wave shape resonance" near threshold (298 eV) for the core ionization of C 2 H 4 [52]. In our present measurement we have used 310-eV photons; i.e., we are at the tail of this shape resonance.…”

Section: Ch 2 + + Ch 2 + Channelmentioning

confidence: 95%

“…From these yields and our branching ratios we can deduce that for 310-eV photons the DA mechanism is likely to dominate. The SA and CA mechanisms are less probable and likely contribute on a comparable level (they are hard to distinguish in [52] as they fall in the similar kinetic energy range of the photoelectron).…”

Section: A Energy Mapsmentioning

confidence: 99%

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Auger decay and subsequent fragmentation pathways of ethylene followingK-shell ionization

et al. 2015

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The fragmentation pathways and dynamics of ethylene molecules after core ionization are explored using coincident measurements of the Auger electron and fragment ions by employing the cold target recoil-ion momentum spectroscopy method. The influence of several factors on the dynamics and kinematics of the dissociation is studied. These include propensity rules, ionization mechanisms, symmetry of the orbitals from which the Auger electrons originate, multiple scattering, conical intersections, interference, and possible core-hole localization for the double ionization of this polyatomic molecule. Energy correlation maps allow probing the multidimensional potential energy surfaces and, in combination with our multiconfiguration self-consistent field calculations, identifying the populated electronic states of the dissociating dication. The measured angular distributions of the Auger electrons in the molecular frame further support and augment these assignments. The deprotonation and molecular hydrogen ion elimination channels show a nearly isotropic Auger electron angular distribution with a small elongation along the direction perpendicular to the molecular axis. For the symmetric breakup the angular distributions show a clear influence of multiple scattering on the outgoing electrons. The lowest kinetic energy release feature of the symmetric breakup channel displays a fingerprint of entangled Auger and photoelectron motion in the angular emission pattern identifying this transition as an excellent candidate to probe core-hole localization at a conical intersection of a polyatomic molecule.

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Section: A Energy Mapssupporting

confidence: 70%

Section: A Energy Mapsmentioning

confidence: 55%

Section: Ch 2 + + Ch 2 + Channelmentioning

confidence: 95%

Section: A Energy Mapsmentioning

confidence: 99%

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Auger decay and subsequent fragmentation pathways of ethylene followingK-shell ionization

et al. 2015

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“…Two paired fragment ions resulting from a breakup channel form a stripe in the PIPICO spectrum (also e.g. [27,[47][48][49][50] of the fragment ions to determine the populated electronic state of the parent dication and the asymptotic final energy. Once determined, these values are used to back trace the path the molecule took through the PES, as discussed in the following subsections.…”

Section: (A)mentioning

confidence: 99%

Photo-double-ionization of ethylene and acetylene near threshold

Gaire¹,

Lee²,

Haxton³

et al. 2014

Phys. Rev. A

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We present kinematically complete measurements of the photo double ionization of ethylene (double CC bond) and acetylene (triple CC bond) hydrocarbons just above the double ionization threshold. We discuss the results in terms of the coincident kinetic energy of the photo electrons and the nuclear kinetic energy release of the recoiling ions. We have incorporated quantum chemistry calculations to interpret which of the electronic states of the dication have been populated and trace the various subsequent fragmentation channels. We suggest pathways that involve the electronic ground and excited states of the precursor ethylene dication and explore the strong influence of the conical intersections between the different electronic states. The nondissociative ionization yield is small in ethylene and high in acetylene when compared with the dissociative ionization channels.The reason for such a striking difference is explained in part on the basis of a propensity rule which influences the population of states in the photo double ionization of a centrosymmetric closed shell molecule by favoring singlet ungerade and triplet gerade final states. This propensity rule and the calculated potential energy surfaces clarify a picture of the dynamics leading to the observed dication dissociation products.

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Fragmentation of C₂H₄ ²⁺ produced by 300 eV electron impact

Wang

Wei

Zhang

et al. 2020

J. Phys. B: At. Mol. Opt. Phys.

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The fragmentation of C2H42+ produced by 300 eV electron impact has been investigated. Both 2-body and 3-body fragmentation channels were observed with an ion–ion coincidence technique. Using the recoil ion momentum spectroscopy, the momentum vector of each ionic fragment was measured and the kinetic energy release (KER) distributions for different fragmentation channels were obtained. For 2-body fragmentation channels, the branching ratios and the peak values of the KER distributions were compared with previous photon ionization experiments. The electronic state information of the parent ion C2H42+ was inferred by comparing the present measured KER values and the predictions in previous works. For 3-body fragmentation channels, the dissociation mechanisms were analyzed according to the signature on the Newton diagram.

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CarbonK-shell photoionization of fixed-in-spaceC2H4<

Cited by 7 publications

References 24 publications

Auger decay and subsequent fragmentation pathways of ethylene followingK-shell ionization

Auger decay and subsequent fragmentation pathways of ethylene followingK-shell ionization

Photo-double-ionization of ethylene and acetylene near threshold

Fragmentation of C₂H₄ ²⁺ produced by 300 eV electron impact

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CarbonK-shell photoionization of fixed-in-spaceC2H4<

Cited by 7 publications

References 24 publications

Auger decay and subsequent fragmentation pathways of ethylene followingK-shell ionization

Auger decay and subsequent fragmentation pathways of ethylene followingK-shell ionization

Photo-double-ionization of ethylene and acetylene near threshold

Fragmentation of C2H4 2+ produced by 300 eV electron impact

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Product

Resources

About

Fragmentation of C₂H₄ ²⁺ produced by 300 eV electron impact