We present results of the studies of dynamics in colloidal crystals performed by pump-probe\nexperiments using an X-ray free-electron laser (XFEL). Colloidal crystals were pumped with an\ninfrared laser at a wavelength of 800 nm with varying power and probed by XFEL pulses at an energy\nof 8 keV with a time delay up to 1000 ps. The positions of the Bragg peaks, and their radial and\nazimuthal widths were analyzed as a function of the time delay. The spectral analysis of the data\ndid not reveal significant enhancement of frequencies expected in this experiment. This allowed us\nto conclude that the amplitude of vibrational modes excited in colloidal crystals was less than the\nsystematic error caused by the noise level.
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