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![[Figure 4]](rx5025fig4mag.jpg)
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Figure 4
(a) Mean radii of the EDTA-stabilized CdS particles (c = 6.25 mM) as a function of reaction time. The synchrotron data (green markers) acquired at the APS 12 ID-C station show a bimodal size distribution. The small particle population has a particle radius of about 7 Å (circles) after 10 s, which is slightly increasing up to 11 Å as a function of time. In the observed time range from 1 to 292 s the larger population (squares) shows a significant increase of the mean particle radius from 40 up to 70 Å. The stroboscopic acquired laboratory data (red markers) reproduce the observed growth mechanism. To achieve this about 20 drops were measured in a stroboscopic mode and a time averaging of 20 s was necessary to achieve a proper data quality. This results in an exposure time of 400 s for each point. In order to achieve a proper data modelling, the size of the small particle population was fixed to 10 Å in radius. (b) Mean radii of the EDTA-stabilized CdS particles (c = 3.13 mM) as a function of reaction time. Using a Pilatus area detector featuring a fast readout (about 100 ms) at the APS 12 ID-B station, a time resolution down to 200 ms was achieved with an initial dead-time of 100 ms. The experiment reproduces the main conclusions of the experiments at the laboratory source and the APS 12 ID-C station for the half CdS concentration. |
![[Figure 4]](rx5025fig4.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
