Electron Volt


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Electron Volt

 

a subsidiary unit of energy, equal to the energy acquired by a particle having an elementary charge, oi the charge of an electron, when the particle is moved in an accelerating electric field between two points with a potential difference of 1 volt. The international symbol is eV.

One electron volt equals 1.60219 x 10–19 joule. Multiple units are also used. For example, the kiloelectron volt (keV) equals 103 eV; the megaelectron volt (MeV) equals 106 eV.

The masses of elementary particles are often expressed in electron volts. Such usage is based on the Einstein mass-energy relation E = mc2. The equation relates the mass m of a particle and the particle’s total energy E; c is the speed of light. The energy corresponding to an atomic mass unit is (931.5016 ± 0.0026) MeV.

References in periodicals archive ?
CMS, one of the LHC's two main detectors, found signs of a particle with a mass of 125.3 billion electron volts, plus or minus 0.6 billion electron volts, Incandela said.
The LHC is capable of collisions at 14 trillion electron volts (TeV), but some of the machine's most extraordinary discoveries could be made at much lower energy levels.
According to Arduini, "The aim once the beam is circulating is to accelerate (it) up to 3.5 (trillion electron volts)."
Myers said, but seven trillion electron volts would require "a lot of training." (ANI)
The spectrum of the gamma rays coming from the remnant (with energies of roughly 1012 electron volts) shows that they originate from the decay of pions --which, in turn, would be created by abundant protons of cosmic-ray energies hitting atoms of gas in the supernova remnant.
To fit with the standard model of particle physics, the Higgs must now be lighter than 145 billion electron volts, or GeV, team members from LHC's ATLAS and CMS experiments reported August 22 in Mumbai, India, at the International Symposium on Lepton Photon Interactions at High Energies.
Brighter colors indicate higher numbers of gamma rays at energies above 200 million electron volts. For comparison, the energy of visible light is between two and three electron volts.
NASA's Fermi Gamma-ray Space Telescope recently recorded gamma rays from Eta Carinae ranging in energy from 20 billion to 50 billion electron volts, Roland Walter of the University of Geneva reported December 9.
ALICE's superconducting linear accelerator accelerated electrons to 99.9 percent of the speed of light, creating a beam with a total energy of 11 million electron volts.
Its 1,600 detectors, spaced about 1.5 kilometers from each other, will analyze the "air showers" of particles created when a cosmic-ray particle carrying an energy of more than 1019 electron volts strikes an atom in the upper atmosphere.
The new result comes from two ongoing experiments at the Fermi National Accelerator Laboratory's Tevatron accelerator in Batavia, Ill., suggesting that the elusive Higgs does not have a mass between 158 billion and 175 billion electron volts. (A billion electron volts, or 1 GeV, is slightly heavier than the mass of a proton.) Ben Kilminster of Fermilab reported the result July 26 in Paris at the International Conference on High Energy Physics, and a paper was posted online at arXiv.org.
Washington, Nov 18 (ANI): UK's next-generation particle accelerator, ALICE, has achieved a major milestone by producing a high-energy particle beam with a total energy of nearly four and a half million electron volts.