Ultrafast electron transfer in dissociating iodomethane and fluoromethane molecules\nwas studied at the Linac Coherent Light Source free-electron laser using an ultravioletpump,\nX-ray-probe scheme. The results for both molecules are discussed with respect to\nthe nature of their UV excitation and different chemical properties. Signatures of longdistance\nintramolecular charge transfer are observed for both species, and a quantitative\nanalysis of its distance dependence in iodomethane is carried out for charge states up to\nI21+ . The reconstructed critical distances for electron transfer are in good agreement\nwith a classical over-the-barrier model and with an earlier experiment employing a nearinfrared\npump pulse
Loading....