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American Institute of Physics, Structural Dynamics, 4(3), p. 043207, 2016

DOI: 10.1063/1.4944344

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Charge transfer in dissociating iodomethane and fluoromethane molecules ionized by intense femtosecond X-ray pulses

Journal article published in 2016 by Rebecca Boll, Benjamin Erk, Ryan Coffee, Sebastian Trippel, Thomas Kierspel ORCID, Cédric Bomme, John D. Bozek, Mitchell Burkett, Sebastian Carron, Ken R. Ferguson, Lutz Foucar, Jochen Küpper, Tatiana Marchenko, Catalin Miron, Minna Patanen ORCID and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Ultrafast electron transfer in dissociating iodomethane and fluoromethane molecules was studied at the Linac Coherent Light Source free-electron laser using an ultraviolet- pump, X-ray-probe scheme. The results for both molecules are discussed with respect to the nature of their UV excitation and different chemical properties. Signatures of long- distance intramolecular charge transfer are observed for both species, and a quantitative analysis of its distance dependence in iodomethane is carried out for charge states up to I21+. The reconstructed critical distances for electron transfer are in good agreement with a classical over-the-barrier model and with an earlier experiment employing a near-infrared pump pulse.