Journal
NEW JOURNAL OF PHYSICS
Volume 17, Issue -, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1367-2630/17/7/073002
Keywords
double core hole; free electron laser; few-photon process; covariance mapping
Categories
Funding
- Swedish Research Council
- Goran Gustafsson Foundation (UU/KTH)
- Knut and Alice Wallenberg Foundation, Sweden
- EPSRC, UK [EP/F034601/1, EP/I032517/1]
- MIUR, Italy [FIRB-RBAP045JF2, FIRB-RBAP06AWK3]
- MEXT
- JSPS
- Cooperative Research Program of Network Joint Research Center for Materials and Devices from MEXT
- Asahi Glass foundation
- US Department of Energy of Science, Basic Energy Science, Chemical, Geosciences, and Biological Divisions
- EPSRC [EP/I032517/1, EP/F034601/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/I032517/1, EP/F034601/1] Funding Source: researchfish
- Grants-in-Aid for Scientific Research [15K04755, 25108003, 26390019] Funding Source: KAKEN
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Few-photon ionization and relaxation processes in acetylene (C2H2) and ethane (C2H6) 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.
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