Recently, I read a paper about scanning ultrafast electron microscopy (SUEM) ( Nano Lett. 2017, 17, 3675−3680). Using this method, the author can directly image the dynamics of photoexcited carriers on the surface of sample. The probing electron beams arrive at the sample after the laser pump beam. So, how can I know the electron beams and laser arrive the sample at the same time point ?

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