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Full-Text Articles in Physics
Escape Of Trajectories From A Vase-Shaped Cavity, Paul Hansen, Kevin A. Mitchell, John B. Delos
Escape Of Trajectories From A Vase-Shaped Cavity, Paul Hansen, Kevin A. Mitchell, John B. Delos
Arts & Sciences Articles
We consider the escape of ballistic trajectories from an open, vase-shaped cavity. Such a system serves as a model for microwaves escaping from a cavity or electrons escaping from a microjunction. Fixing the initial position of a particle and recording its escape time as a function of the initial launch direction, the resulting escape-time plot shows “epistrophic fractal” structure—repeated structure within structure at all levels of resolution with new features appearing in the fractal at longer time scales. By launching trajectories simultaneously in all directions (modeling an outgoing wave), a detector placed outside the cavity would measure a train of …
Electron Dynamics In Parallel Electric And Magnetic Fields, Christian Bracher, Tobias Kramer, John B. Delos
Electron Dynamics In Parallel Electric And Magnetic Fields, Christian Bracher, Tobias Kramer, John B. Delos
Arts & Sciences Articles
We examine the spatial distribution of electrons generated by a fixed energy point source in uniform, parallel electric, and magnetic fields. This problem is simple enough to permit analytic quantum and semiclassical solution, and it harbors a rich set of features which find their interpretation in the unusual and interesting properties of the classical motion of the electrons: For instance, the number of interfering trajectories can be adjusted in this system, and the turning surfaces of classical motion contain a complex array of singularities. We perform a comprehensive analysis of the semiclassical approximation and compare it to the quantum solution, …
Motion Of An Electron From A Point Source In Parallel Electric And Magnetic Fields, Christian Bracher, John B. Delos
Motion Of An Electron From A Point Source In Parallel Electric And Magnetic Fields, Christian Bracher, John B. Delos
Arts & Sciences Articles
Negative ions undergoing near-threshold photodetachment in a weak laser field provide an almost pointlike, isotropic source of low-energy electrons. External fields exert forces on the emitted coherent electron wave and direct its motion. Here, we examine the spatial distribution of photodetached electrons in uniform, parallel electric and magnetic fields. The interplay of the electric and magnetic forces leads to a surprising intricate shape of the refracted electron wave, and mutiple interfering trajectories generate complex fringe patterns in the matter wave. The exact quantum solution is best understood in terms of the classical electron motion.