Abstract
100 ps time-resolved X-ray solution-scattering capabilities have been developed using multilayer optics at the beamline NW14A, Photon Factory Advanced Ring, KEK. X-ray pulses with an energy bandwidth of DeltaE/E = 1-5% are generated by reflecting X-ray pulses (DeltaE/E = 15%) through multilayer optics, made of W/B(4)C or depth-graded Ru/C on silicon substrate. This tailor-made wide-bandwidth X-ray pulse provides high-quality solution-scattering data for obtaining photo-induced molecular reaction dynamics. The time-resolved solution scattering of CH(2)I(2) in methanol is demonstrated as a typical example.
Highlights
The photon flux of the X-ray pulse increases with the energy bandwidth, but the simulation shows that the 15% energy bandwidth with the default spectrum with a long tail is not suitable for time-resolved solution-scattering experiments owing to insufficient q-resolution
The purpose of this paper is to present a detailed account of achievements with the multilayer optics
Wide-bandwidth X-ray pulses were generated from depthgraded Ru/C and W/B4C multilayer optics for time-resolved X-ray solution scattering
Summary
The photon flux of the X-ray pulse increases with the energy bandwidth, but the simulation shows that the 15% energy bandwidth with the default spectrum with a long tail is not suitable for time-resolved solution-scattering experiments owing to insufficient q-resolution. The long tail of the default X-ray spectrum induces a much higher extent of blurring at high scattering angles than a symmetric Gaussian spectrum with the same bandwidth. For this reason, the X-ray spectrum with a long tail at ID09B of ESRF with $ 3% bandwidth is comparable with a Gaussian spectrum with $ 10% bandwidth. In our experimental set-up, the multilayer optics can produce X-rays with a 1–5% energy bandwidth, and allow us to measure the time-resolved solution-scattering with the undulator at the NW14A beamline.
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