| beta particle |
a high-speed positron or electron ejected from a nucleus in radioactive decay or fission. |
| betatron |
in physics, an electron accelerator in which the speed of the electrons is increased to high energies, from a few million to a few hundred million electron volts, by the action of a rapidly changing magnetic field. |
| BeV |
a unit of energy equal to one billion electron-volts. [1/2 definitions] |
| bevatron |
a synchrotron used to accelerate protons and other particles to a level of several billion electron-volts. |
| bremsstrahlung |
electromagnetic radiation, such as x-rays, produced by the sudden deceleration or acceleration of an electron caused by its approach to an atomic nucleus. |
| corpuscle |
a very small particle of matter, such as a photon or electron. [1/2 definitions] |
| electron gun |
the electron-emitting cathode in a cathode ray tube together with the electromagnetic apparatus that collects and focuses the electron stream. |
| electron lens |
an electric or magnetic field, or a combination of the two, that is used to focus or deflect an electron beam. |
| electron-volt |
a unit of energy equal to the energy of one electron accelerated by one volt, or equal to 1.602 times 10-12 erg. |
| eV |
abbreviation of "electron-volt," or "electron-volts," a unit of energy equal to the energy of one electron accelerated by one volt, or equal to 1.602 times 10-12 erg. |
| grid bias |
the potential difference applied between the control grid of an electron tube and a cathode. |
| high-energy particle |
an atom or part of an atom having energy greater than one hundred thousand electron volts. |
| hydrogen ion |
the positive ion of a hydrogen atom whose electron has been removed, as in acids. |
| interelectron |
combined form of electron. |
| ion |
an atom, group of atoms, or molecule that bears a positive electric charge as a result of electron loss or a negative charge as a result of electron gain. [1/2 definitions] |
| keV |
a unit of energy equal to one thousand electron-volts; kiloelectron volt. |
| lepton2 |
any of a group of subatomic particles such as the electron, muon, and neutrino that have a spin of one-half and very little or no mass. |
| meson |
any of a group of elementary particles that react strongly with other particles, and that have a mass between that of the electron and that of the proton. |
| MeV |
a unit of energy equal to one million electron-volts. |
| muon |
an unstable subatomic particle with a positive or negative charge, having 207 times the mass of an electron. |
| osmium |
a chemical element that has seventy-six protons in each nucleus and that occurs as an octavalent ion or in pure form as an extremely hard, dense, brittle bluish metal solid used as a catalyst and esp. in alloys and in electron microscopy because of its extremely high density. (symbol: Os) |