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Imaging charge transfer in iodomethane upon X-ray photoabsorption.

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Boll,  R.
Research Group of Structural Dynamics of (Bio)Chemical Systems, MPI for Biophysical Chemistry, Max Planck Society;

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Citation

Erk, B., Boll, R., Trippel, S., Anielski, D., Foucar, L., Rudek, B., et al. (2014). Imaging charge transfer in iodomethane upon X-ray photoabsorption. Science, 345(6194), 288-291. doi:10.1126/science.1253607.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002C-01CB-2
Abstract
Studies of charge transfer are often hampered by difficulties in determining the charge localization at a given time. Here, we used ultrashort x-ray free-electron laser pulses to image charge rearrangement dynamics within gas-phase iodomethane molecules during dissociation induced by a synchronized near-infrared (NIR) laser pulse. Inner-shell photoionization creates positive charge, which is initially localized on the iodine atom. We map the electron transfer between the methyl and iodine fragments as a function of their interatomic separation set by the NIR–x-ray delay. We observe signatures of electron transfer for distances up to 20 angstroms and show that a realistic estimate of its effective spatial range can be obtained from a classical over-the-barrier model. The presented technique is applicable for spatiotemporal imaging of charge transfer dynamics in a wide range of molecular systems.