Electron ionization - Wikipedia
Electron ionization (EI, formerly known as electron impact ionization [1] and electron bombardment ionization [2]) is an ionization method in which energetic electrons interact with solid or gas phase atoms or molecules to produce ions. [3]
3.1: Electron Ionization - Chemistry LibreTexts
Electron Ionization (EI) is the most common ionization technique used for mass spectrometry. * EI works well for many gas phase molecules, but it does have some limitations. Although the mass spectra are very reproducible and are widely used for spectral libraries, EI causes extensive fragmentation so that the molecular ion is not observed for ...
5.1 Basics of Impact-Ionization - TU Wien
Impact-ionization is a three-particle generation process. Carriers that gain high energies while traveling through high field regions undergo scattering events with bonded electrons in the valence band.
2.3: Ionization Techniques - Chemistry LibreTexts
2023年2月11日 · In electron impact ionization, a vaporized sample is passed through a beam of electrons. The high energy (typically 70 eV) beam strips electrons from the sample molecules leaving a positively charged radical species.
Impact ionization - Wikipedia
Impact ionization is the process in a material by which one energetic charge carrier can lose energy by the creation of other charge carriers. For example, in semiconductors , an electron (or hole ) with enough kinetic energy can knock a bound electron out of its bound state (in the valence band ) and promote it to a state in the conduction ...
Electron Impact Ionization - SpringerLink
Modern experimental methods have made it possible to effectively measure and explore threshold laws, differential cross sections, partial cross sections, inner-shell ionization, and the ionization of unstable species such as radicals and ions.
NIST: Electron-Impact Cross Section Database - Intro.
We present below total ionization cross sections for a large numbers of atoms/molecules, and singly differential ionization cross sections (energy distribution of ejected electrons) for H, He, and H 2. Excitation cross sections for H, He, and Li are also presented.
Mass Spectrometry Ionization Methods - Emory University
Electron Impact ionization (EI) - EI is done by volatilizing a sample directly in the source that is contained in a vacuum system directly attached to the analyzer. The gas phase molecules are bombarded by a beam of electrons formed by heating a filament bias at a negative voltage compared to the source.
Electron impact ionization of a positive ion may occur directly, when one or more electrons are ejected from an outer or inner shell by direct impact with the incident electron, or indirectly, via an intermediate autoionizing state of the target
Ionization cross sections for low energy electron transport Hee Seo, Maria Grazia Pia, Paolo Saracco and Chan Hyeong Kim Abstract—Two models for the calculation of ionization cross sections by electron impact on atoms, the Binary-Encouter-Bethe and the Deutsch-Mark models, have been implemented; they are¨