The American physicist Arthur Holly Compton (1892-1962),
the Nobel Prize in Physics 1927, who made important contributions
to the study of X- and cosmic rays.
Fr.: catastrophe de Compton
In a compact, steady radio-source where the density of relativistic electrons and the density of synchrotron radiation due to these electrons are very large, the radio photons should be transformed into X-ray and gamma-ray photons through inelastic Compton scatterings onto the relativistic electrons. Thus the radio photons should rapidly disappear and only gamma-ray photons should be observed. This phenomenon does not take place if the radio source is in relativistic expansion.
→ Compton; → catastrophe.
Fr.: effet Compton
Increase in the wavelength of an → X-ray or → gamma ray → photon when it collides a → free → electron. The photon transfers part of its energy to the electron, the electron recoils, and the photon itself is scattered at a reduced energy.
Fr.: équation de Compton
Theoretical equation which gives the change in the photon wavelength due to the → Compton effect.
Fr.: ère de Compton
A period in the early evolution of the Universe, before t = 10-23 sec when the radius of curvature of the Universe was less than the → Compton wavelength of typical particles.
Fr.: recul de Compton
The change of direction undergone by the electron in the → Compton effect. The scattered photon and the collided electron move in different directions from that of the incident photon.
parâkaneš-e Compton (#)
Fr.: diffusion Compton
Scattering of a → photon due to the → Compton effect.
→ Compton; → scattering.
Fr.: décalage de Compton
Of the → Compton effect, the amount of increase in the wavelength of an energetic photon upon its collision with an electron.
Fr.: suppression de Compton
In → gamma ray → spectroscopy, a technique to reduce the contribution of gamma rays generated by → Compton scattering.
→ Compton; → suppression.
mowjtul-e Compton, tul-e mowj-e ~
Fr.: longueur d'onde de Compton, longueur d'onde Compton
The quantum wavelength of a particle with a highly relativistic velocity. The Compton wavelength is given by h/mc, where h is Planck's constant, m is the mass of the particle, and c the light speed. For an electron, the Compton wavelength is about 2.4 × 10-10 cm, intermediate between the size of an atomic nucleus and an atom.
→ Compton; → wavelength.
The change in the → spectrum of → electromagnetic radiation due to → scattering from → electrons. When → photons and electrons coexist in the same volume of space, their → collisions can → transfer energy from photons to electrons (→ Compton effect) or from electrons to photons (→ inverse Compton effect).
Verbal noun of → Comptonize; → -tion.
The verb describing the → Camptonization process.
Fr.: émission comptonisée
Emission undergone → Comptonization.
→ Comptonize; → emission.
double Compton scattering
parâkaneš-e Compton-e dotâyi
Fr.: diffusion Compton double
An electron-photon interaction that can be thought of as a → Compton scattering event associated with the production or destruction of an extra photon.
→ double; → Compton; → scattering.
inverse Compton effect
oskar-e Compton-e vârun
Fr.: effet Compton inverse
A → scattering process by which fast-moving, energetic particles transfer energy to photons, decreasing the wavelength of the radiation. This is a particularly important effect in astrophysics and cosmology since it explains the → Sunyaev-Zel'dovich effect.
→ inverse; → Compton effect.