New publications on FLASH-Coulomb-explosion imaging of controlled difluoroiodobenzene molecules
15 May, 2017
Our publication entitled “Alignment, Orientation, and Coulomb Explosion of Difluoroiodobenzene Studied with the Pixel Imaging Mass Spectrometry (PImMS) Camera” has been published in the Journal of Chemical Physics.
I+3 fragment-ion kinetic-energy distributions corresponding to four different delays
Our publications entitled “Alignment, Orientation, and Coulomb Explosion of Difluoroiodobenzene Studied with the Pixel Imaging Mass Spectrometry (PImMS) Camera” and "Jitter-correction for IR/UV-XUV pump-probe experiments at the FLASH free-electron laser" have been published in the Journal of Chemical Physics, and the New Journal of Physics respectively. We have studied adiabatic laser alignment and mixed-field orientation of 2,6-difluoroiodobenzene molecules by Coulomb explosion imaging following either near-infrared strong-field ionization or extreme-ultraviolet multi-photon inner-shell ionization using free-electron laser pulses at FLASH. In our work we combined the PImMS camera, a time-stamping pixelated detector that can record the hit positions and arrival times of up to four ions per pixel per acquisition cycle, with a double sided velocity-map imaging spectrometer for simultaneous ion and electron detection. In addition we have studied the UV-induced dissociation of 2,6-difluoroiodobenzene using a jitter correction to compensate for the intrinsic FEL-UV timing jitter. The relative timing jitter could be reduced thereby from 90 fs to 15 fs. Both approaches, in combination with laser-induced molecular alignment, are important steps towards the investigation of ultrafast molecular dynamics at FELs.