Affinity Electron

Broad in scope, this book describes the general theory and practice of using the Electron Capture Detector (ECD) to study reactions of thermal electrons with molecules. It reviews electron affinities and thermodynamic and kinetic parameters of atoms, small molecules, and large organic molecules obtained by using various methods.

For more than 90 years, researchers around the world have relied on the CRC Handbook of Chemistry and Physics for authoritative, up-to-date data. This year will be no exception. New tables, extensive updates, and added sections mean the Handbook again sets a new standard for reliability, utility, and thoroughness. New tables in this edition include: Proton Affinities, Electron Inelastic Mean Free Paths, Selected Properties of Semiconductor Solid Solutions, and Vapor Pressures (Solvent Activities) for Binary Polymer Solutions. Sections substantially revised and updated include NIST Atomic Transition Probability Tables, Summary Tables of Particle Properties, and Threshold Limits for Airborne Contaminants. The 86th Edition also marks a fresh look for the Handbook. A larger format and new layout makes it easier to read and a new typeface makes the tables and diagrams crystal clear.

Electron affinity - In chemistry, electron affinity is the amount of energy absorbed when an electron is added to a neutral isolated gaseous atom to form a gaseous ion with a -1 charge. It has a negative value if energy is released.

Nearly-free electron model - The nearly free electron model is a modification of the free electron gas model which includes a weak periodic perturbation meant to model the interaction between the conduction electrons and the ions in a crystalline solid. This model, like the free electron model, does not take into account electron-electron interactions; that is, the independent electron approximation is still in effect.

Koopmans' theorem - ... theorem is an approximation in molecular orbital theory, such as density functional theory, or Hartree-Fock theory, in which the first ionization energy of a molecule is equal to the energy of the highest occupied molecular orbital (the HOMO), and the electron affinity is the negative of the energy of the lowest unoccupied, i.e.

Electron excitation - Electron excitation is the movement of an electron to a higher energy state. This can either be done by photoexcitation (PE), where the original electron absorbs the photon and gains all the photon's energy or by electrical excitation (EE), where the original electron absorbs the energy of another, energetic electron.

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