A high-repetition rate scheme for synchrotron-based picosecond laser pump/x-ray probe experiments on chemical and biological systems in solution

Frederico A. Lima*, Christopher J. Milne, Chiranthika Dimali Amarasinghe Amarasinghe, Mercedes Hannelore Rittmann-Frank, Renske M. van der Veen, Marco Reinhard, Van-Thai Pham, Susanne Karlsson, Steven L. Johnson, Daniel Grolimund, Camelia Borca, Thomas Huthwelker, Markus Janousch, Frank van Mourik, Rafael Abela, Majed Chergui

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

102 Citations (Scopus)

Abstract

We present the extension of time-resolved optical pump/x-ray absorption spectroscopy (XAS) probe experiments towards data collection at MHz repetition rates. The use of a high-power picosecond laser operating at an integer fraction of the repetition rate of the storage ring allows exploitation of up to two orders of magnitude more x-ray photons than in previous schemes based on the use of kHz lasers. Consequently, we demonstrate an order of magnitude increase in the signal-to-noise of time-resolved XAS of molecular systems in solution. This makes it possible to investigate highly dilute samples at concentrations approaching physiological conditions for biological systems. The simplicity and compactness of the scheme allows for straightforward implementation at any synchrotron beamline and for a wide range of x-ray probe techniques, such as time-resolved diffraction or x-ray emission studies. (C) 2011 American Institute of Physics. [doi:10.1063/1.3600616]

Original languageEnglish
Article number063111
Number of pages16
JournalReview of Scientific Instruments
Volume82
Issue number6
DOIs
Publication statusPublished - Jun 2011

Keywords

  • TRANSIENT ABSORPTION-SPECTROSCOPY
  • STRUCTURAL DYNAMICS
  • MOLECULAR-STRUCTURES
  • CARBON-MONOXIDE
  • EXCITED-STATE
  • FINE-STRUCTURE
  • SPIN-STATE
  • X-RAYS
  • MYOGLOBIN
  • XANES

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