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Rayleigh scattering causes the blue color of the daytime sky and the reddening of the Sun at sunset. Rayleigh scattering (/ ˈ r eɪ l i / RAY-lee), named after the 19th-century British physicist Lord Rayleigh (John William Strutt), [1] is the predominantly elastic scattering of light, or other electromagnetic radiation, by particles with a size much smaller than the wavelength of the radiation.
Rayleigh scattering is a process in which electromagnetic radiation (including light) is scattered by a small spherical volume of variant refractive indexes, such as a particle, bubble, droplet, or even a density fluctuation. This effect was first modeled successfully by Lord Rayleigh, from whom it gets its name.
4 / 2. Simplest scattering experiment: plane wave impinging on localized potential, V (r), e.g. electron striking atom, or particle a nucleus. Basic set-up: flux of particles, all at the same energy, scattered from target and collected by detectors which measure angles of deflection.
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Compton scattering (or the Compton effect) is the quantum theory of high frequency photons scattering following an interaction with a charged particle, usually an electron. Specifically, when the photon hits electrons, it releases loosely bound electrons from the outer valence shells of atoms or molecules. The effect was discovered in 1923 by ...
Sep 29, 2023 · The Compton scattering equation relates the photon’s wavelength change to the scattering angle and the electron’s rest mass. The equation is written as: Δλ= λ′ –λ = h mec (1–cosθ) Δ λ = λ ′ – λ = h m e c ( 1 – cos θ) Where: Δλ is the change in wavelength of the photon. λ’ is the wavelength of the scattered photon.
Sep 12, 2022 · In Equation 6.4.6, ℏ = h / 2π is the reduced Planck’s constant (pronounced “h-bar”), which is just Planck’s constant divided by the factor 2π. Vector →l is called the “wave vector” or propagation vector (the direction in which a photon is moving). The propagation vector shows the direction of the photon’s linear momentum vector.
Consequently, Compton scattering is one of the pri-mary mechanisms for the loss of energy of gamma ray photons when they pass through matter. Figure 1 is a diagram of Compton scattering. Momentum p r At Rest Rest Mass m 0 ˚ Energy Ef Energy Ei Energy E r Figure 1: Compton scattering. An incident photon having en-ergy Ei strikes a stationary ...
