Crossref journal-article
AIP Publishing
The Journal of Chemical Physics (317)
Abstract

We present the case for exploiting time-resolved x-ray absorption to study structural dynamics in the liquid phase. With this aim in mind and considering the large differences between absorption coefficients in the optical and the x-ray domains as well as the x-ray absorption cross sections due to unexcited species, we have estimated the anticipated signal-to-noise ratio (S/N) under realistic conditions with femtosecond laser pump pulses and synchrotron radiation x-ray probe pulses. As a model system, we examine I− photodetachment in water and detect the appearance of laser-generated neutral I atoms by their x-ray near-edge absorption structure (XANES) and by their extended x-ray absorption fine structure (EXAFS). While the S/N ratio critically depends on the photolysis yield, which itself is governed by the optical absorption cross section, the optimum sample concentration varies in a complex fashion as a function of pump laser intensity and optical absorption cross section. However, concentrations yielding near total absorption of the pump laser deliver quite optimum S/N ratios. The calculations presented here provide guidelines for the implementation of time-resolved x-ray absorption experiments in condensed phase chemical systems.

Bibliography

Bressler, C., Saes, M., Chergui, M., Grolimund, D., Abela, R., & Pattison, P. (2002). Towards structural dynamics in condensed chemical systems exploiting ultrafast time-resolved x-ray absorption spectroscopy. The Journal of Chemical Physics, 116(7), 2955–2966.

Authors 6
  1. Christian Bressler (first)
  2. Melanie Saes (additional)
  3. Majed Chergui (additional)
  4. Daniel Grolimund (additional)
  5. Rafael Abela (additional)
  6. Philip Pattison (additional)
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Dates
Type When
Created 23 years, 1 month ago (July 26, 2002, 9:24 a.m.)
Deposited 1 year, 6 months ago (Feb. 6, 2024, 11:14 p.m.)
Indexed 1 year ago (Aug. 17, 2024, 1:08 a.m.)
Issued 23 years, 6 months ago (Feb. 15, 2002)
Published 23 years, 6 months ago (Feb. 15, 2002)
Published Print 23 years, 6 months ago (Feb. 15, 2002)
Funders 0

None

@article{Bressler_2002, title={Towards structural dynamics in condensed chemical systems exploiting ultrafast time-resolved x-ray absorption spectroscopy}, volume={116}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.1435618}, DOI={10.1063/1.1435618}, number={7}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Bressler, Christian and Saes, Melanie and Chergui, Majed and Grolimund, Daniel and Abela, Rafael and Pattison, Philip}, year={2002}, month=feb, pages={2955–2966} }