Deconvoluting ultrafast structural dynamics: temporal resolution beyond the pulse length of synchrotron radiation

Neutze, R.; Wouts, R.

doi:10.1107/S0909049599012352

Figure 1
Illustration of a deconvolution approach using a realistic X-ray pulse profile. (a) The X-ray pulse profile used for these simulations, which approximates the measured single-bunch pulse profile of the ESRF (courtesy of K. Scheidt and G. Naylor). (b) A comparison between the measurement of an exponential decay, $[\Delta I(t)\propto\exp(-t/\tau)]$ , after deconvolution (solid line) with an idealized measurement (dashed line). Experimental noise was taken to obey a Gaussian distribution with standard deviation $[\sigma]$ = 5% of $[\Delta I]$ _max, 100 steps of $[\Delta t]$ = 18 ps were taken, and the deconvoluted signal was numerically filtered. (c) A comparison between two further simulations with the decay constant $[\tau]$ = 30 ps, where 100 steps of $[\Delta t]$ = 12 ps were taken. Deconvoluted intensities as a function of time, in combination with a spectroscopic characterization of the time scales of interest, would provide a starting point from which to build and refine the sample's rapid structural dynamics. Intensity units are arbitrary.

JOURNAL OF
SYNCHROTRON
RADIATION

ISSN: 1600-5775

Volume 7| Part 1| January 2000| Pages 22-26

doi:10.1107/S0909049599012352

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