Ionization Physics

Physics: F. Zwicky Ionization in Gases by Ions and Atoms

It has been assumed for a long time that the ionization of atoms by ions must in one form or another play an important r6le in the phenomena of gas discharges. This assumption found its mathematical expression in the well-known theory of Townsend. Only recently, however, have the elementary effects of the ionization by ions been experimentally investigated. The ionization of noble gas atoms by ...

Modeling of Ionization Physics with the PIC Code OSIRIS

Abstract. When considering intense particle or laser beams propagating in dense plasma or gas, ionization plays an important role. Impact ionization and tunnel ionization may create new plasma electrons, altering the physics of wakefield accelerators, causing blue shifts in laser spectra, creating and modifying instabilities, etc. Here we describe the addition of an impact ionization package in...

Ionization Physics Evidence for Magnetic Flare Origin of the X-rays in Agn

We present full disk X-ray reflection spectra for two currently popular accretion flow geometries for AGN – the lamppost model frequently used to discuss the iron line reverberation in AGN, and the model where the X-rays are produced in magnetic flares above a cold accretion disk (AD). The lamppost spectra contain several spectroscopic features characteristic of highly ionized material that are...

MICE: the Muon Ionization Cooling Experiment Step I: First Measurement of Emittance with Particle Physics Detectors

Institute for Mathematical Physics Macroscopic Models for Ionization in the Presence of Strong Electric Fields Macroscopic Models for Ionization in the Presence of Strong Electric Fields

Starting from a kinetic model for electrons in a weakly ionized plasma, a spherical harmonic expansion (SHE-) model is derived by a formal asymptotic analysis for strongly disparate masses of electrons and ions. The macroscopic limit of the SHE-model for high elds gives a high eld extension of standard macroscopic models for ionization.