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Article Dans Une Revue Journal of Physical Chemistry Letters Année : 2016

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

Résumé

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-center dot) 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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Dates et versions

hal-01344589 , version 1 (12-07-2016)

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Steven Daly, Marion Girod, Marin Vojkovic, Alexandre Giuliani, Rodolphe Antoine, et al.. Single-Photon, Double Photodetachment of Nickel Phthalocyanine Tetrasulfonic Acid 4-Anions. Journal of Physical Chemistry Letters, 2016, 7 (13), pp.2586-2590. ⟨10.1021/acs.jpclett.6b01030⟩. ⟨hal-01344589⟩
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