Single-Photon Multiple Detachment in Fullerene Negative Ions: Absolute Ionization Cross Sections and the Role of the Extra Electron

Bilodeau, R. C.; Gibson, N. D.; Walter, C. W.; Macaluso, David; Schippers, S.; Müller, A.; Phaneuf, R. A.; Aguilar, A.; Hoener, M.; Rost, Jan M.; Berrah, N.

doi:10.1103/physrevlett.111.043003

Cited by 21 publications

(17 citation statements)

References 35 publications

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“…[25,34] studying photoionization time delays of neutral A@C 60 endohedrals. No comprehensive research has been performed on time delays upon photoionization of A@C q 60 anions which are other types of nano-formations of interest [41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Wigner photoemission time delay from endohedral anions

et al. 2016

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Characteristic features of Wigner photoemission time delay from endohedral anions A@C q 60 along with their dependence on the anion charge q are unraveled. Specifically, significant enhancement of the time delay in the innermost dipole photoionization channels near threshold is found, owing to the presence of the Coulomb confined resonances (CRs). Moreover, it is shown that interchannel coupling of the inner-shell Coulomb CRs with outer-shell photoionization channels results in resonantly enhanced time delay in the release of the outer-shell photoelectron well above-several hundreds eV-the outer-shell thresholds. It is also demonstrated that, and explained why, photoionization cross sections of the innermost subshells as well as outer subshells (near the inner-subshell threshold) depends only very weakly on the anion charge q, but the dependence of the corresponding time delays on q can be significant. Furthermore, Coulomb CRs are found to emerge in the innermost quadrupole photoionization channels as well, thereby causing considerable time delay in the quadrupole photoemission. These findings are illustrated in calculations of the photoionization of inner and outer subshells of the endohedral anions Ne@C −1 60 and Ne@C −5 60 that were chosen as case studies.

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Section: Introductionmentioning

confidence: 99%

Wigner photoemission time delay from endohedral anions

et al. 2016

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“…At the same time, sample purity is not an issue since unwanted beam components can be efficiently suppressed by the in-situ mass/charge analysis. The classes of cluster ions that have been most intensely studied so far are charged fullerenes [66,67] and endohedral fullerenes [68][69][70][71].…”

Section: Atoms In Cages: Photoionization Of Endohedral Fullerene Ionsmentioning

confidence: 99%

Photoionisation of ions with synchrotron radiation: from ions in space to atoms in cages

Schippers

Kilcoyne

Phaneuf

et al. 2015

Contemporary Physics

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The photon-ion merged-beams technique for the photoionization of mass/charge selected ionized atoms, molecules and clusters by x-rays from synchrotron radiation sources is introduced. Examples for photoionization of atomic ions are discussed by going from outer-shell ionization of simple few-electron systems to inner-shell ionization of complex many-electron ions. Fundamental ionization mechanisms are elucidated and the importance of the results for applications in astrophysics and plasma physics is pointed out. Finally, the unique capabilities of the photon-ion merged-beams technique for the study of photoabsorption by nanoparticles are demonstrated by the example of endohedral fullerene ions.

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“…These observations pave the way toward new, exciting experiments for probing double photodetachment at relatively low energies, including correlation measurements on emitted photoelectrons. 4 The detachment of two electrons from a gas-phase species via the absorption of a single photon is a common process that is observed in systems as diverse as neutral or charged atoms, small molecules, molecular anions and multiply charged proteins (Table 1) [1][2][3][4][5][6][7][8][9][10][11][12][13] . A range of mechanisms for double electron detachment are available, including processes such Auger emission, shakeoff processes, knock-out and relaxation following double excitation.…”

mentioning

confidence: 99%

Single-Photon, Double Photodetachment of Nickel Phthalocyanine Tetrasulfonic Acid 4- Anions

Daly

Girod

Vojković

et al. 2016

J. Phys. Chem. Lett.

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Single-photon, two-electron photodetachment from nickel phthalocyanine tetrasulfonic acid tetra anions, [NiPc](4-), was examined in the gas-phase using a linear ion trap coupled to the DESIRS VUV beamline of the SOLEIL Synchrotron. This system was chosen since it has a low detachment energy, known charge localization, and well-defined geometrical and electronic structures. A threshold for two-electron loss is observed at 10.2 eV, around 1 eV lower than previously observed double detachment thresholds on multiple charged protein anions. The photodetachment energy of [NiPc](4-) has been previously determined to be 3.5 eV and the photodetachment energy of [NiPc](3-•) is determined in this work to be 4.3 eV. The observed single photon double electron detachment threshold is hence 5.9 eV higher than the energy required for sequential single electron loss. Possible mechanisms are for double photodetachment are discussed. These observations pave the way toward new, exciting experiments for probing double photodetachment at relatively low energies, including correlation measurements on emitted photoelectrons.

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Single-Photon Multiple Detachment in Fullerene Negative Ions: Absolute Ionization Cross Sections and the Role of the Extra Electron

Cited by 21 publications

References 35 publications

Wigner photoemission time delay from endohedral anions

Wigner photoemission time delay from endohedral anions

Photoionisation of ions with synchrotron radiation: from ions in space to atoms in cages

Single-Photon, Double Photodetachment of Nickel Phthalocyanine Tetrasulfonic Acid 4- Anions

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