Related Experiment Video
Updated: May 20, 2026
Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
Published on: August 22, 2017
A time-resolved powder diffraction study of in-situ photodimerization kinetics of 9-methylanthracene using a CCD area
Ahmed F Mabied1, Melanie Müller, Robert E Dinnebier
1Department of Materials Structure Science, School of High Energy Accelerator Science (KEK), The Graduate University for Advanced Studies (Sokendai), Tsukuba 305-0801, Japan.
Abstract:
The [4π + 4π] photodimerization process of the 9-substituted anthracene derivative crystalline 9-methylanthracene (9-MA) was investigated using time-resolved X-ray powder diffraction. The study was carried out in-situ using a CCD area detector. Sequential and parametric Rietveld refinement was applied for quantitative phase analysis. The results of traditional sequential Rietveld refinement showed that the evolution of the dimerization process can be described using the Johnson-Mehl-Avrami-Kolmogorov (JMAK) model. The parameters of the JMAK equation were obtained successfully by parametric Rietveld refinement and suggest that the reaction follows heterogeneous nucleation and one-dimensional growth with a decreasing nucleation rate.
