Journal ArticleDOI
Velocity map imaging of ions and electrons using electrostatic lenses: Application in photoelectron and photofragment ion imaging of molecular oxygen
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TLDR
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.Abstract:
The application of electrostatic lenses is demonstrated to give a substantial improvement of the two-dimensional (2D) ion/electron imaging technique. This combination of ion lens optics and 2D detection makes “velocity map imaging” possible, i.e., all particles with the same initial velocity vector are mapped onto the same point on the detector. Whereas the more common application of grid electrodes leads to transmission reduction, severe trajectory deflections and blurring due to the non-point source geometry, these problems are avoided with open lens electrodes. A three-plate assembly with aperture electrodes has been tested and its properties are compared with those of grid electrodes. The photodissociation processes occurring in molecular oxygen following the two-photon 3dπ(3Σ1g −)(v=2, N=2)←X(3Σg −) Rydberg excitation around 225 nm are presented here to show the improvement in spatial resolution in the ion and electron images. Simulated trajectory calculations show good agreement with experiment and ...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
Control of Electron Localization in Molecular Dissociation
Matthias F. Kling,Ch. Siedschlag,Aart J. Verhoef,Jafar Iqbal Khan,Martin Schultze,Thorsten Uphues,Y. Ni,M. Uiberacker,Markus Drescher,Markus Drescher,Ferenc Krausz,Marcus Vrakking +11 more
TL;DR: It is demonstrated how the subcycle evolution of the electric field of light can be used to control the motion of bound electrons and provides evidence of its usefulness in controlling reaction dynamics.
Journal ArticleDOI
Femtosecond time-resolved photoelectron spectroscopy.
TL;DR: Femtosecond time-resolved or wave packet methods offer a view complementary to the usual spectroscopic approach and often yield a physically intuitive picture in discerning underlying dynamics.
Journal ArticleDOI
Laser-Induced Electron Tunneling and Diffraction
M. Meckel,M. Meckel,D. Comtois,D. Zeidler,D. Zeidler,André Staudte,André Staudte,D. Pavičić,H. C. Bandulet,Henri Pépin,Jean-Claude Kieffer,Reinhard Dörner,David M. Villeneuve,Paul B. Corkum +13 more
TL;DR: It is shown that the momentum distribution of the extracted electron carries the fingerprint of the highest occupied molecular orbital, whereas the elastically scattered electrons reveal the position of the nuclear components of the molecule.
Journal ArticleDOI
Two-dimensional charged particle image inversion using a polar basis function expansion
TL;DR: The pBasex algorithm as mentioned in this paper reconstructs the original Newton sphere of expanding charged particles from its two-dimensional projection by fitting a set of basis functions with a known inverse Abel integral, adapted to the polar symmetry of the photoionization process to optimize the energy and angular resolution.
References
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Journal ArticleDOI
Time-of-flight mass spectrometer with improved resolution
W. C. Wiley,I. H. McLaren +1 more
TL;DR: In this paper, a new type of ion gun is described which greatly improves the resolution of a nonmagnetic time-of-flight mass spectrometer, and the focusing action of this gun is discussed and analyzed mathematically.
Journal ArticleDOI
One-dimensional tomography: a comparison of Abel, onion-peeling, and filtered backprojection methods.
TL;DR: It is shown that the Abel inversion, onion-peeling, and filtered backprojection methods can be intercompared without assumptions about the object being deconvolved.
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.
Journal ArticleDOI
Photodissociation of acetylene at 193.3 nm
Alec M. Wodtke,Yuan T. Lee +1 more
TL;DR: In this article, the authors measured the translational energy release for processes C2H2 193 nm/C2H + H (I) and C 2H 193 nm /C2+H (II) using the molecular time-of-flight method and determined that the C-H bond energy in acetylene, D0(C 2H-H), is 132 +/- 2 kcal/mol.
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