Journal ArticleDOI
Two-dimensional charged particle image inversion using a polar basis function expansion
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TLDR
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.Abstract:
We present an inversion method called pBasex aimed at reconstructing 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. The basis functions have been adapted to the polar symmetry of the photoionization process to optimize the energy and angular resolution while minimizing the CPU time and the response to the cartesian noise that could be given by the detection system. The method presented here only applies to systems with a unique axis of symmetry although it can be adapted to overcome this restriction. It has been tested on both simulated and experimental noisy images and compared to the Fourier-Hankel algorithm and the original Cartesian basis set used by [Dribinski et al.Rev. Sci. Instrum. 73, 2634 (2002)], and appears to give a better performance where odd Legendre polynomials are involved, while in the images where only even terms are present the method has been shown to be faster and simpler without compromising its accuracy.read more
Citations
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Femtosecond time-resolved photoelectron imaging.
TL;DR: Femtosecond time-resolved photoelectron imaging (TRPEI) is a variant of TPEI used in the study of gas-phase photoinduced dynamics as mentioned in this paper.
Journal ArticleDOI
Circular dichroism in the photoelectron angular distributions of camphor and fenchone from multiphoton ionization with femtosecond laser pulses.
Christian Lux,Matthias Wollenhaupt,Tom Bolze,Qingqing Liang,Jens Köhler,Cristian Sarpe,Thomas Baumert +6 more
TL;DR: Shine a light: a circular dichroism effect in the ±10 % regime on randomly oriented chiral molecules in the gas phase is demonstrated and the enantiomers are distinguished.
Journal ArticleDOI
Toward real-time charged-particle image reconstruction using polar onion-peeling
TL;DR: A method to reconstruct full three-dimensional photofragment distributions from their two-dimensional (2D) projection onto a detection plane is presented, for processes in which the expanding Newton sphere has cylindrical symmetry around an axis parallel to the projection plane.
Journal ArticleDOI
Coherent control with a short-wavelength free-electron laser
Kevin C. Prince,Kevin C. Prince,Enrico Allaria,Carlo Callegari,Riccardo Cucini,G. De Ninno,G. De Ninno,S. Di Mitri,Bruno Diviacco,Eugenio Ferrari,Paola Finetti,David Gauthier,Luca Giannessi,Luca Giannessi,Nicola Mahne,Giuseppe Penco,Oksana Plekan,Lorenzo Raimondi,P. Rebernik,Eléonore Roussel,Cristian Svetina,Cristian Svetina,M. Trovo,Marco Zangrando,Matteo Negro,Paolo Carpeggiani,Maurizio Reduzzi,Giuseppe Sansone,Alexei N. Grum-Grzhimailo,Elena V. Gryzlova,S. I. Strakhova,Klaus Bartschat,Nicolas Douguet,Joel Venzke,D. Iablonskyi,Yoshiaki Kumagai,Takuma Takanashi,K. Ueda,Andreas Fischer,Marcello Coreno,Frank Stienkemeier,Y. Ovcharenko,Tommaso Mazza,Michael Meyer +43 more
TL;DR: In this paper, the phase correlation of two colours (63.0 and 31.5 nm wavelengths) in a free-electron laser and control photoelectron angular distribution by adjusting phase with 3 attosecond resolution was demonstrated.
Journal ArticleDOI
Imaging CF3I conical intersection and photodissociation dynamics with ultrafast electron diffraction
Jie Yang,Xiaolei Zhu,Xiaolei Zhu,Thomas J. A. Wolf,Zheng Li,Zheng Li,Zheng Li,J. Pedro F. Nunes,Ryan Coffee,Ryan Coffee,James P. Cryan,Markus Gühr,Markus Gühr,Kareem Hegazy,Kareem Hegazy,Tony F. Heinz,Tony F. Heinz,Keith Jobe,Renkai Li,Xiaozhe Shen,Theodore Veccione,Stephen Weathersby,Kyle J. Wilkin,Charles Yoneda,Qiang Zheng,Todd J. Martínez,Todd J. Martínez,Martin Centurion,Xijie Wang +28 more
TL;DR: This work presents the simultaneous experimental characterization of one-photon and two- photon excitation channels in isolated CF3I molecules using ultrafast gas-phase electron diffraction and mapped out the real-space trajectories of a coherent nuclear wave packet, which bifurcates onto two potential energy surfaces when passing through a conical intersection.
References
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The Fourier Transform and Its Applications
TL;DR: In this paper, the authors provide a broad overview of Fourier Transform and its relation with the FFT and the Hartley Transform, as well as the Laplace Transform and the Laplacian Transform.
Journal ArticleDOI
The Fourier Transform and its Applications.
T. K. Boehme,Ronald N. Bracewell +1 more
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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.
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
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.
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