Perspective: Advanced particle imaging

Abstract

Finite slice analysis (FINA)-A general reconstruction method for velocity mapped and time-sliced ion imaging The Journal of Chemical Physics 147, 013913 (2017) 1445-1447 (1987)], demonstrating the capability of collecting an image of the photofragments from a unimolecular dissociation event and analyzing that image to obtain the three-dimensional velocity distribution of the fragments, the efficacy and breadth of application of the ion imaging technique have continued to improve and grow. With the addition of velocity mapping, ion/electron centroiding, and slice imaging techniques, the versatility and velocity resolution have been unmatched. Recent improvements in molecular beam, laser, sensor, and computer technology are allowing even more advanced particle imaging experiments, and eventually we can expect multi-mass imaging with co-variance and full coincidence capability on a single shot basis with repetition rates in the kilohertz range. This progress should further enable "complete" experiments-the holy grail of molecular dynamics-where all quantum numbers of reactants and products of a bimolecular scattering event are fully determined and even under our control. Published by AIP Publishing.

Observation of Photoelectron Circular Dichroism Using a Nanosecond Laser

“…[9] As PECD has been observed for single-photon ionization out of an achiral core-shell orbital, it has been interpreted as being mainly a final state effect. [7,10] Measuring PECD has been boosted by techniques capturing the full photoelectron momentum distribution such as velocity map imaging (VMI) [11] or a recently developed stereo-electron detector. [12] Recently, single-photon PECD [13,14] highlighting in addition the relevance for astrophysical research [15] has been reviewed.Note that ionization with a single photon is independent on the temporal structure of the light.…”

Pendular alignment and strong chemical binding are induced in helium dimer molecules by intense laser fields

“…Lower limit of probe pulse duration ranges from 3 to 5 ps. The alignment of the dimer axis, recorded by hcos 2 θi, provides another test, accessible by particle-imaging techniques (30).…”

“…10B. That invites another experimental test, detecting trajectories of the emerging helium atoms by means of an imaging technique widely used for photodissociation and reactive molecular collisions (30). At first blush, the predicted distribution of kinetic energy is not much different between α 0 = 0 and α 0 = 0.5, so the peak exit velocity of the He atoms should be similar.…”

Quantum state-to-state vacuum ultraviolet photodissociation dynamics of small molecules

“…Thanks to the availability of all kinds of commercial laser systems and the recent development of state-of-the-art photofragment detection methods, especially the velocity-map ion imaging (VMI) technique [1,2], the H-atom Rydberg tagging time-offlight (HRTOF) technique [3,4] and the tunable vacuum ultraviolet-vacuum ultraviolet (VUV-VUV) laser pump-probe double-resonance method [5], photodissociation studies can now be performed to the state- † Dedicated to Professor Kopin Liu on the occasion of his 70th birthday. * Authors to whom correspondence should be addressed.…”

“…In the present review, we mainly discuss about the recent photodissociation studies that use tunable VUV radiations generated by TPR-FWM or free electron laser as the photolysis sources, and use VMI, HRTOF, and tunable VUV laser ionization as the photofragment detection methods. The technical details and the recent developments of the VMI, HRTOF, and two-color tunable VUV-VUV laser pump-probe techniques have been discussed in recent two perspectives and one review [2,4,12], thus we will mainly focus on the experimental and theoretical results in the present review without mentioning the technical details. Besides reviewing the existing work in the literature, we will also provide future prospects for further improving the VUV photodissociation experiment.…”