Journal
FARADAY DISCUSSIONS
Volume 171, Issue -, Pages 93-111Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4fd00051j
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Funding
- Engineering and Physical Sciences Research Council (EPSRC, United Kingdom) through the Programme Grant on Attosecond Dynamics [EP/I032517/1]
- ERC ASTEX project [290467]
- EPSRC through the Career Acceleration Fellowship [EP/H003657/1]
- Czech Science Foundation [GACR P208/12/0521]
- EPSRC [EP/H003657/1, EP/I032517/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/I032517/1, EP/H003657/1] Funding Source: researchfish
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Ultrafast hole dynamics created in molecular systems as a result of sudden ionisation is the focus of much attention in the field of attosecond science. Using the molecule glycine we show through ab initio simulations that the dynamics of a hole, arising from ionisation in the inner valence region, evolves with a timescale appropriate to be measured using X-ray pulses from the current generation of SASE free electron lasers. The examined pump-probe scheme uses X-rays with photon energy below the K edge of carbon (275-280 eV) that will ionise from the inner valence region. A second probe X-ray at the same energy can excite an electron from the core to fill the vacancy in the inner-valence region. The dynamics of the inner valence hole can be tracked by measuring the Auger electrons produced by the subsequent refilling of the core hole as a function of pump-probe delay. We consider the feasibility of the experiment and include numerical simulation to support this analysis. We discuss the potential for all X-ray pump-X-ray probe Auger spectroscopy measurements for tracking hole migration.
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