Single-Photon, Double Photodetachment of Nickel Phthalocyanine Tetrasulfonic Acid 4- Anions.
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.
Institut Lumière Matière, Université Claude Bernard Lyon 1, CNRS UMR 5306 , F-69622 Lyon, France.
Steven
S
Daly
Institut des Sciences Analytiques, Université de Lyon, Université Claude Bernard Lyon 1, CNRS & ENS Lyon, UMR 5280 , 69100 Villeurbanne, France.
Marion
M
Girod
Institut Lumière Matière, Université Claude Bernard Lyon 1, CNRS UMR 5306 , F-69622 Lyon, France.
Marin
M
Vojkovic
SOLEIL, l'Orme des Merisiers, St Aubin, BP48, F-91192 Gif sur Yvette Cedex, France.|INRA, UAR1008 Caractérisation et Élaboration des Produits Issus de l'Agriculture, F-44316 Nantes, France.
Alexandre
A
Giuliani
Institut Lumière Matière, Université Claude Bernard Lyon 1, CNRS UMR 5306 , F-69622 Lyon, France.
Rodolphe
R
Antoine
SOLEIL, l'Orme des Merisiers, St Aubin, BP48, F-91192 Gif sur Yvette Cedex, France.
Laurent
L
Nahon
Richard A J
RA
O'Hair
Institut Lumière Matière, Université Claude Bernard Lyon 1, CNRS UMR 5306 , F-69622 Lyon, France.
Philippe
P
Dugourd