Covariance mapping of two-photon double core hole states in C2H2 and C2H6 produced by an x-ray free electron laser
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
Few-photon ionization and relaxation processes in acetylene (C_2 H_2) and ethane (C_2 H_6) were investigated at the linac coherent light source x-ray free electron laser (FEL) at SLAC, Stanford using a highly efficient multi-particle correlation spectroscopy technique based on a magnetic bottle. The analysis method of covariance mapping has been applied and enhanced, allowing us to identify electron pairs associated with double core hole (DCH) production and competing multiple ionization processes including Auger decay sequences. The experimental technique and the analysis procedure are discussed in the light of earlier investigations of DCH studies carried out at the same FEL and at third generation synchrotron radiation sources. In particular, we demonstrate the capability of the covariance mapping technique to disentangle the formation of molecular DCH states which is barely feasible with conventional electron spectroscopy methods.
Date Issued
2015-07-02
Date Acceptance
2015-05-28
Citation
New Journal of Physics, 2015, 17
ISSN
1367-2630
Publisher
IOP Publishing
Journal / Book Title
New Journal of Physics
Volume
17
Copyright Statement
© 2015 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
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Subjects
Science & Technology
Physical Sciences
Physics, Multidisciplinary
Physics
double core hole
free electron laser
few-photon process
covariance mapping
CORRELATED MOLECULAR CALCULATIONS
GAUSSIAN-BASIS SETS
ATOMS
SPECTROSCOPY
IONIZATION
FEL
Publication Status
Published
Article Number
073002