3 years ago

Probing the UV-Induced Photodissociation of CH$_\text{3}$I and C$_\text{6}$H$_\text{3}$F$_\text{2}$I with Femtosecond Time-Resolved Coulomb Explosion Imaging at FLASH.

Benjamin Erk, Sebastian Trippel, Michael Burt, Faruk Krecinic, Felix Brauße, Per Johnsson, Mark Brouard, Stefan Düsterer, Rebecca Boll, Harald Redlin, Simone Techert, Henrik Stapelfeldt, Hauke Höppner, Jochen Küpper, Jason W. L. Lee, Joss Wiese, Maria Müller, Terence Mullins, Artem Rudenko, Anatoli Ulmer, Alexandra Lauer, Nora Berrah, Erland Müller, Daniel Rolles, Claire Vallance, Rolf Treusch, Sven Toleikis, Evgeny Savelyev, Jan Thøgersen, Thomas Kierspel, Cédric Bomme, Kasra Amini, Lauge Christensen, Nora Schirmel, Arnaud Rouzée

We explore time-resolved Coulomb explosion induced by intense, extreme ultraviolet (XUV) femtosecond pulses from the FLASH free-electron laser as a method to image photo-induced molecular dynamics in two molecules, iodomethane and 2,6-difluoroiodobenzene. At an excitation wavelength of 267\,nm, the dominant reaction pathway in both molecules is neutral dissociation via cleavage of the carbon--iodine bond. This allows investigating the influence of the molecular environment on the absorption of an intense, femtosecond XUV pulse and the subsequent Coulomb explosion process. We find that the XUV probe pulse induces local inner-shell ionization of atomic iodine in dissociating iodomethane, in contrast to non-selective ionization of all photofragments in difluoroiodobenzene. The results reveal evidence of electron transfer from methyl and phenyl moieties to a multiply charged iodine ion. In addition, indications for ultrafast charge rearrangement on the phenyl radical are found, suggesting that time-resolved Coulomb explosion imaging is sensitive to the localization of charge in extended molecules.

Publisher URL: http://arxiv.org/abs/1708.00676

DOI: arXiv:1708.00676v2

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