Molecular dynamics is of fundamental interest in natural science research. The capability\nof investigating molecular dynamics is one of the various motivations for ultrafast optics. We present\nour investigation of photoionization and nuclear dynamics in methyl iodine (CH3I) molecule with\nan X-ray pump X-ray probe scheme. The pumpââ?¬â??probe experiment was realized with a two-mirror\nX-ray split and delay apparatus. Time-of-flight mass spectra at various pumpââ?¬â??probe delay times were\nrecorded to obtain the time profile for the creation of high charge states via sequential ionization and\nfor molecular dissociation. We observed high charge states of atomic iodine up to 29+, and visualized\nthe evolution of creating these high atomic ion charge states, including their population suppression\nand enhancement as the arrival time of the second X-ray pulse was varied. We also show the\nevolution of the kinetics of the high charge states upon the timing of their creation during the\nionization-dissociation coupled dynamics. We demonstrate the implementation of X-ray pumpââ?¬â??probe\nmethodology for investigating X-ray induced molecular dynamics with femtosecond temporal\nresolution. The results indicate the footprints of ionization that lead to high charge states, probing the\nlong-range potential curves of the high charge states.
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