Hetero-site-specific X-ray pump-probe spectroscopy for femtosecond intramolecular dynamics

A. Picón (), C. S. Lehmann, C. Bostedt, A. Rudenko, A. Marinelli, T. Osipov, D. Rolles, N. Berrah, C. Bomme, M. Bucher, G. Doumy, B. Erk, K. R. Ferguson, T. Gorkhover, P. J. Ho, E. P. Kanter, B. Krässig, J. Krzywinski, A. A. Lutman, A. M. March, D. Moonshiram, D. Ray, L. Young, S. T. Pratt and S. H. Southworth
Additional contact information
A. Picón: Argonne National Laboratory
C. S. Lehmann: Argonne National Laboratory
C. Bostedt: Argonne National Laboratory
A. Rudenko: J.R. Macdonald Laboratory, Kansas State University
A. Marinelli: SLAC National Accelerator Laboratory
T. Osipov: SLAC National Accelerator Laboratory
D. Rolles: J.R. Macdonald Laboratory, Kansas State University
N. Berrah: University of Connecticut
C. Bomme: Deutsches Elektronen-Synchrotron (DESY)
M. Bucher: Argonne National Laboratory
G. Doumy: Argonne National Laboratory
B. Erk: Deutsches Elektronen-Synchrotron (DESY)
K. R. Ferguson: SLAC National Accelerator Laboratory
T. Gorkhover: SLAC National Accelerator Laboratory
P. J. Ho: Argonne National Laboratory
E. P. Kanter: Argonne National Laboratory
B. Krässig: Argonne National Laboratory
J. Krzywinski: SLAC National Accelerator Laboratory
A. A. Lutman: SLAC National Accelerator Laboratory
A. M. March: Argonne National Laboratory
D. Moonshiram: Argonne National Laboratory
D. Ray: SLAC National Accelerator Laboratory
L. Young: Argonne National Laboratory
S. T. Pratt: Argonne National Laboratory
S. H. Southworth: Argonne National Laboratory

Nature Communications, 2016, vol. 7, issue 1, 1-6

Abstract: Abstract New capabilities at X-ray free-electron laser facilities allow the generation of two-colour femtosecond X-ray pulses, opening the possibility of performing ultrafast studies of X-ray-induced phenomena. Particularly, the experimental realization of hetero-site-specific X-ray-pump/X-ray-probe spectroscopy is of special interest, in which an X-ray pump pulse is absorbed at one site within a molecule and an X-ray probe pulse follows the X-ray-induced dynamics at another site within the same molecule. Here we show experimental evidence of a hetero-site pump-probe signal. By using two-colour 10-fs X-ray pulses, we are able to observe the femtosecond time dependence for the formation of F ions during the fragmentation of XeF2 molecules following X-ray absorption at the Xe site.

Date: 2016
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DOI: 10.1038/ncomms11652

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