Analysis of a measurement scheme for ultrafast hole dynamics by few femtosecond resolution X-ray pump– probe Auger spectroscopy

Article

Analysis of a measurement scheme for ultrafast hole dynamics by few femtosecond resolution X-ray pump– probe Auger spectroscopy

Cooper, B.; Kolorenč, P.; Frasinski,L. J.; Averbukha, V.; Marangos, J. P.

Faraday Discuss. 171, 93-111 (2014)

Abstract

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.

Institute authors

Kolorenč, Přemysl

Supported by

GACR 208/12/0521 — Non-radiative relaxation processes in ionized atomic and molecular systems

BibTeX

@article{UTF514,
  author        = {Cooper, B. and Kolorenč, P. and Frasinski,L. J. and Averbukha, V. and Marangos, J. P.},
  title         = {{Analysis of a measurement scheme for ultrafast hole dynamics by few femtosecond resolution X-ray pump– probe Auger spectroscopy}},
  journal       = {Faraday Discuss.},
  volume        = {171},
  pages         = {93-111},
  year          = {2014},
  doi           = {10.1039/c4fd00051j},
}