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024 7 _ |a 10.1002/chem.202101515
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100 1 _ |a Schubert, Kaja
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245 _ _ |a Ionization and photofragmentation of isolated metalloporphyrin cations investigated by VUV action spectroscopy
260 _ _ |a Weinheim
|c 2021
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520 _ _ |a We investigated the photoionization and fragmentation of isolated metal protoporphyrin IX cations (MPPIX+ with M=Fe, Co, Zn) by means of vacuum-ultraviolet (VUV) action spectroscopy in the energy range of 8.5–35 eV. Experiments were carried out in the gas phase by interfacing an electrospray ionization tandem mass spectrometer with a synchrotron beamline. The mass spectra and partial ion yields show that photoexcitation of the precursor ions predominantly leads to .CH$_2$COOH radical side-chain losses of the macrocycle with additional methyl radical (.CH$_3$) side-chain losses. Ionization, in contrast, leads to the formation of the intact ionized precursor and various doubly charged fragments which are mostly due to side-chain cleavages. Although statistical fragmentation dominates, we found evidence for non-statistical processes such as new fragments involving for example single and double H2O losses, indicating that different relaxation mechanisms are at play upon photoionization compared to photoexcitation. The measured ionization energies were 9.6±0.2 eV, 9.4±0.2 eV and 9.6±0.2 eV for FePPIX$^+$, CoPPIX$^+$ and ZnPPIX$^+$, respectively.
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536 _ _ |a DFG project 28586557 - SFB 755: Photonische Abbildungen auf der Nanometerskala (28586557)
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700 1 _ |a Schwob, Lucas
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700 1 _ |a Dörner, Simon
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700 1 _ |a Girod, Marion
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700 1 _ |a MacAleese, Luke
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700 1 _ |a Pieterse, Cornelius L.
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700 1 _ |a Schlathölter, Thomas
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700 1 _ |a Techert, Simone
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700 1 _ |a Bari, Sadia
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773 _ _ |a 10.1002/chem.202101515
|g Vol. 27, no. 48, p. 12371 - 12379
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856 4 _ |u https://bib-pubdb1.desy.de/record/459413/files/Chemistry%20A%20European%20J%20-%202021%20-%20Schubert%20-%20Ionization%20and%20Photofragmentation%20of%20Isolated%20Metalloporphyrin%20Cations.pdf
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