Attosecond coherent electron motion in Auger-Meitner decay

Funding: S.L., Z. Z., and A.M. acknowledge support from DOE, BES Scientific User Facilities Division Field Work Proposal 100317; J.D. and A. M. were supported by the Laboratory Directed Research and Development Program in support of the Panofsky fellowship. The contributions from T.D., P.H.B., A.K., A.N., J.T.O., T.J.A.W., A.L.W., and J.P.C. were supported by the U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences (BES), Chemical Sciences, Geosciences, and Biosciences Division (CSGB); E.G.C. was supported by the DOE Laboratory Directed Research and Development program at SLAC National Accelerator Laboratory, under contract DE-AC02-76SF00515. P.R. and M.F.K. acknowledge support by the German Research Foundation via KL-1439/10, and the Fellow program of the Max Planck Society. V.A, J.C.T.B., D.G., J.P.Mar. gratefully acknowledge funding support from UK EPSRC grants No. EP/R019509/1, EP/T006943/1 and No. EP/ I032517/1. N.B., R.O. and A.C.L. acknowledge the Chemical Sciences, Geosciences and Biosciences Division, Office of Basic Energy Sciences, Office of Science, US Department of Energy, grant no. DE-SC0012376. C.B. acknowledges the Swiss National Science Foundation and the National Center of Competence in Research – Molecular Ultrafast Science and Technology NCCR – MUST. L.F.D. and L.F. acknowledge support from NSF Grant No. 1605042 and DOE DE-FG02-04ER15614. W.H. thanks the German BMBF for funding of the project ‘SpeAR_XFEL’ under the contract number 05K19PE1. Use of the Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515. Author contributions: SL, AM and JPC devised the experimental scheme. S.L., A.M., J.P.C. developed the experimental apparatus. S.L., J.D., J.P.Mac., Z.Z., and A.M. prepared the attosecond X-ray pulses. M-F.L., N.H.S., P.W. prepared the experimental beam-line. All Authors participated in the collection and interpretation of the experimental data. T.D. led the data analysis. S.L., T.D., P.R., and E.G.C. worked on the single-shot ‘streaking’ diagnostic. S.L., T.D., A.M., and J.P.C. prepared an initial version of the manuscript. All authors provided critical feedback in preparing the submitted manuscript. Competing interests: None declared. Data and materials availability: The partially analyzed raw data and the raw data from the calculations is available on the Zenodo repository (38). All (other) data needed to evaluate the conclusions in the paper are present in the paper or the Supplementary Materials.

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