Title: Alignment, Orientation, and Coulomb Explosion of Difluoroiodobenzene Studied with the Pixel Imaging Mass Spectrometry (PImMS) Camera,
Abstract: Laser-induced adiabatic alignment and mixed-field orientation of
2,6-difluoroiodobenzene (C6H3F2I) molecules are probed by Coulomb explosion
imaging following either near-infrared strong-field ionization or
extreme-ultraviolet multi-photon inner-shell ionization using free-electron
laser pulses. The resulting photoelectrons and fragment ions are captured by a
double-sided velocity map imaging spectrometer and projected onto two
position-sensitive detectors. The ion side of the spectrometer is equipped with
the Pixel Imaging Mass Spectrometry (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. Thus, the time-of-flight trace and ion
momentum distributions for all fragments can be recorded simultaneously. We
show that we can obtain a high degree of one- and three-dimensional alignment
and mixed- field orientation, and compare the Coulomb explosion process induced
at both wavelengths.