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Disentangling formation of multiple-core holes in aminophenol molecules exposed to bright X-FEL radiation

Journal article
Authors Vitali Zhaunerchyk
Magdalena Kaminska
M. Mucke
Richard J. Squibb
John H. D. Eland
Maria Novella Piancastelli
Leszek Frasinski
Jakob Grilj
Markus Koch
Bryan McFarland
Emilie Sistrunk
Markus Guehr
Ryan Coffee
Christoph Bostedt
John Bozek
Peter Salen
Peter van der Meulen
Per LInusson
Richard Thomas
Mats Larsson
Lutz Foucar
Joachim Ullrich
Koji Motomura
Subhendu Mondal
Kiyoshi Ueda
Robert Richter
Kevin Prince
Osamu Takahashi
Timur Osipov
Li Fang
Brendan Murphy
Nora Berrah
Raimund Feifel
Published in Journal of Physics B: Atomic, Molecular and Optical Physics
Volume 48
Issue 24
Pages 244003
ISSN 0953-4075
Publication year 2015
Published at Department of Physics (GU)
Pages 244003
Language en
Subject categories Physical Sciences


Competing multi-photon ionization processes, some leading to the formation of double core hole states, have been examined in 4-aminophenol. The experiments used the linac coherent light source (LCLS) x-ray free electron laser, in combination with a time-of-flight magnetic bottle electron spectrometer and the correlation analysis method of covariance mapping. The results imply that 4-aminophenol molecules exposed to the focused x-ray pulses of the LCLS sequentially absorb more than two x-ray photons, resulting in the formation of multiple core holes as well as in the sequential removal of photoelectrons and Auger electrons (so-called PAPA sequences).

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