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Photo-ionization and fragmentation of ScN@C following excitation above the Sc K-edge.
J Chem Phys
September 2019
Department of Physics, University of Connecticut, Storrs, Connecticut 06269, USA.
We have investigated the ionization and fragmentation of a metallo-endohedral fullerene, ScN@C, using ultrashort (10 fs) x-ray pulses. Following selective ionization of a Sc (1s) electron (hν = 4.55 keV), an Auger cascade leads predominantly to either a vibrationally cold multiply charged parent molecule or multifragmentation of the carbon cage following a phase transition.
View Article and Find Full Text PDFOptical Spectroscopy of Small Carbon Clusters from Electron-Impact Fragmentation and Ionization of Fullerene-C.
J Phys Chem A
June 2019
Division of Physical Chemistry of Microscopic Systems , Karlsruhe Institute of Technology (KIT), Karlsruhe 76131 , Germany.
A series of cationic molecular fragments (C , n = 11, 12, 15, 16, 18, and 21), produced by electron-impact ionization of C in the gas phase, were each mass-selected and accumulated in cryogenic Ne matrices. Optical absorption measurements in the UV-vis and IR spectral ranges reveal linear carbon chain structures. In particular, we have observed the known electronic transitions of linear C, C, and C.
View Article and Find Full Text PDFA comparative VUV absorption mass-spectroscopy study on protonated peptides of different size.
Phys Chem Chem Phys
August 2017
Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747AG Groningen, The Netherlands.
The ionization of gas-phase protonated peptides and proteins can induce molecular responses ranging from purely non-dissociative ionization to extensive multifragmentation of the system. In the case of soft X-ray photoionization, a monotonic transition between both regimes occurs in the mass range between 0.5 and 10 kDa.
View Article and Find Full Text PDFAbsolute Configuration from Different Multifragmentation Pathways in Light-Induced Coulomb Explosion Imaging.
Chemphyschem
August 2016
Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße, 35032, Marburg, Germany.
The absolute configuration of individual small molecules in the gas phase can be determined directly by light-induced Coulomb explosion imaging (CEI). Herein, this approach is demonstrated for ionization with a single X-ray photon from a synchrotron light source, leading to enhanced efficiency and faster fragmentation as compared to previous experiments with a femtosecond laser. In addition, it is shown that even incomplete fragmentation pathways of individual molecules from a racemic CHBrClF sample can give access to the absolute configuration in CEI.
View Article and Find Full Text PDFDecay of C60 by delayed ionization and C2 emission: experiment and statistical modeling of kinetic energy release.
J Chem Phys
August 2012
LASIM, Université de Lyon and CNRS UMR 5579, 43 Bd du 11 Novembre 1918, F69622 Villeurbanne Cedex, France.
C(60) molecules highly excited in the nanosecond regime decay following ionization and dissociation by emitting a series of carbon dimers, as well as other small fragments if excitation is strong enough. The fragmentation mass spectrum and kinetic energy release of all charged fragments obtained in these experiments are interpreted within the framework of the Weisskopf theory, using a realistic Monte Carlo procedure in which the rates of all relevant decay channels are modeled using Arrhenius expressions. Comparison between the measurements and the simulated spectra allows the distribution of deposited energy to be accurately estimated.
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