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- Title
X-ray induced dimerization of cinnamic acid: Time-resolved inelastic X-ray scattering study.
- Authors
Hakala, Mikko; Huotari, Simo; Sahle, Christoph J.; Müller, Harald; Khriachtchev, Leonid; Inkinen, Juho; Niskanen, Johannes; Talka, Tuomas; Hashemi, Javad; Akbari, Ali
- Abstract
A classic example of solid-state topochemical reactions is the ultraviolet-light induced photodimerization of α-trans-cinnamic acid (CA). Here, we report the first observation of an X-ray-induced dimerization of CA and monitor it in situ using nonresonant inelastic X-ray scattering spectroscopy (NRIXS). The time-evolution of the carbon core-electron excitation spectra shows the effects of two X-ray induced reactions: dimerization on a short time-scale and disintegration on a long time-scale. We used spectrum simulations of CA and its dimerization product, α-truxillic acid (TA), to gain insight into the dimerization effects. From the time-resolved spectra, we extracted component spectra and time-dependent weights corresponding to CA and TA. The results suggest that the X-ray induced dimerization proceeds homogeneously in contrast to the dimerization induced by ultraviolet light. We also utilized the ability of NRIXS for direct tomography with chemical-bond contrast to image the spatial progress of the reactions in the sample crystal. Our work paves the way for other time-resolved studies on chemical reactions using inelastic X-ray scattering.
- Subjects
CINNAMIC acid; DIMERIZATION; X-ray scattering; INELASTIC scattering; ULTRAVIOLET radiation; TIME-resolved spectroscopy; ELECTRONIC excitation
- Publication
Scientific Reports, 2015, p15851
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/srep15851