Journal ArticleDOI
Improved two-dimensional product imaging : the real-time ion-counting method
TLDR
In this article, a novel ion counting method for improving the spatial resolution and detection sensitivity of two-dimensional product imaging in molecular beam experiments is presented, which makes use of real-time digital image processing to retrieve, threshold, and determine the local maximum of each ion hitting a microchannel plate assembly.Abstract:
A novel ion-counting method for significantly improving the spatial resolution and detection sensitivity of two-dimensional product imaging in molecular beam experiments is presented. The method makes use of real-time digital image processing to retrieve, threshold, and determine the local maximum of each ion hitting a microchannel plate assembly. The current version can process data at rates up to 3.07 Mbyte/s, and methods for accelerating this rate are proposed.read more
Citations
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Journal ArticleDOI
Reconstruction of Abel-transformable images: The Gaussian basis-set expansion Abel transform method
TL;DR: In this article, a method for reconstructing 3D images with cylindrical symmetry from their two-dimensional projections is presented, which is based on expanding the projection in a basis set of functions that are analytical projections of known well-behaved functions.
Journal ArticleDOI
Direct current slice imaging
TL;DR: Gebhardt et al. as mentioned in this paper reported a new variation of the velocity map ion imaging method that allows the central section of the photofragment ion cloud to be recorded exclusively.
Journal ArticleDOI
Slice imaging: A new approach to ion imaging and velocity mapping
Christoph R. Gebhardt,T. Peter Rakitzis,Peter C. Samartzis,Vlassis Ladopoulos,Theofanis N. Kitsopoulos +4 more
TL;DR: In this article, the authors used delayed pulsed extraction of the ions following photodissociation and positioning of the nascent products to obtain a sufficient velocity spread in the ion cloud such that the time width of the ion packet at the detector is on the order of 500 ns.
Journal ArticleDOI
Imaging the dynamics of gas phase reactions
Michael N. R. Ashfold,N. Hendrik Nahler,Andrew J. Orr-Ewing,Olivier P. J. Vieuxmaire,Rachel L. Toomes,Theofanis N. Kitsopoulos,Ivan Anton Garcia,Dmitri A. Chestakov,Shiou-Min Wu,David H. Parker +9 more
TL;DR: The evolution of the Ion imaging technique is traced, some of the more important breakthroughs with regards to improving image resolution and in image processing and analysis methods are highlighted, and the many applications to which the technique is now being applied are illustrated.
Journal ArticleDOI
Chemical reaction dynamics with molecular beams
TL;DR: In this paper, a review describes advances which have occurred during the past decade in chemical reaction dynamics using crossed molecular beams, and a selection of case studies are considered in some detail, to exemplify recent improvements in our understanding of gas-phase neutral reaction dynamics.
References
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Journal ArticleDOI
Velocity map imaging of ions and electrons using electrostatic lenses: Application in photoelectron and photofragment ion imaging of molecular oxygen
TL;DR: In this paper, the photodissociation processes occurring in molecular oxygen following the two-photon 3dπ(3Σ1g −) Rydberg excitation around 225 nm are presented to show the improvement in spatial resolution in the ion and electron images.
Book
Molecular Reaction Dynamics and Chemical Reactivity
TL;DR: In this article, the authors deal with the molecular-level mechanism of elementary chemical reactions, and progress from the basic principles of physical chemistry to up-to-date research results to provide an understanding of chemical reactivity and physical rate processes from the fundamental point of view of atom-atom interactions all the way to the description of catalysis.
Journal ArticleDOI
Two‐dimensional imaging of state‐selected photodissociation products detected by multiphoton ionization
David Chandler,Paul L. Houston +1 more
TL;DR: In this article, a new technique is presented that makes it possible, with a single laser pulse, to determine the three-dimensional spatial distribution of state-selected photoproducts.
Journal ArticleDOI
A high‐intensity multi‐purpose piezoelectric pulsed molecular beam source
TL;DR: In this article, a piezoelectric valve is described which delivers intense gas pulses limited by the nozzle for diameters of up to 1.0 mm, and the upper limit of the repetition rate is near 1 kHz.
Journal ArticleDOI
Imaging techniques for the study of chemical reaction dynamics.
Albert J. R. Heck,David Chandler +1 more
TL;DR: Newly developed techniques for the simultaneous measurement of asymptotic properties of the reaction, measuring the quantum-state or velocity (speed and angle) distributions of the products are the subject of this review.
Related Papers (5)
Velocity map imaging of ions and electrons using electrostatic lenses: Application in photoelectron and photofragment ion imaging of molecular oxygen
Two‐dimensional imaging of state‐selected photodissociation products detected by multiphoton ionization
David Chandler,Paul L. Houston +1 more