Is Thomson scattering coherent?
Light scattering from free electrons is described by Thomson scattering in the low-energy limit, with a cross-section of 8 π / 3 e 2 / 4 π ε 0 m c 2 2 , and by Compton scattering in the relativistic limit. Free electron lasers are a source of tunable coherent radiation from the microwave region to the ultraviolet.
What is the result of coherent scatter?
Coherent Scattering: In a coherent scattering event you have a diagnostic X-ray come in and then the X-ray goes out with a different angle but the same energy. Photoelectric Effect: The diagnostic X-ray comes in and then that X-ray is stopped locally and an electron and a characteristic lower energy photon are emitted.
Who first described coherent scattering?
204). These formulae are known as the Fresnel reflection coefficients in honor of their discoverer, Jean Augustin Fresnel. In fact, as expected, all the classical results of electromagnetic theory are identical with the coherent scattering model.
What is the difference between Compton and Thomson scattering?
An electromagnetic wave impinging on a charged particle, such as an electron, creates an oscillating motion of the charge. If the motion of the charge is nonrelativistic, the process is called Thompson scattering. The relativistic case is called Compton scattering.
What is the difference between Thomson scattering and Rayleigh scattering?
Rayleigh scattering is produced when light is scattered by particles in a medium, without a change in wavelength. Thomson scattering is produced when a charged particle elastically scatters a photon.
What is the difference between Compton scatter and coherent scatter?
The real difference comes when we deal with atoms. In that case, if the scattering leaves the atom in the ground state, we deal with coherent scattering (see above), whereas if the electron is ejected from the atoms, the scattering is (incoherent) Compton scattering.
How does Thomson scattering work?
Thomson scattering is the scattering of photons by free electrons in an ionized gas. Since the number density of scattered photons and their spectral distribution is directly related to important plasma properties such as ne and Te, it is one of the most prominent techniques in plasma diagnostics.
How does Mie scattering work?
Mie scattering is elastic scattered light of particles that have a diameter similar to or larger than the wavelength of the incident light. The Mie signal is proportional to the square of the particle diameter. Mie scattering is often used to measure flow velocities applying Particle Image Velocimetry (PIV).
What do you mean by scattering?
scattering, in physics, a change in the direction of motion of a particle because of a collision with another particle. As defined in physics, a collision can occur between particles that repel one another, such as two positive (or negative) ions, and need not involve direct physical contact of the particles.
Is Compton scattering coherent or incoherent?
The Compton scattering of an x-ray is incoherent because there are de- grees of freedom in each scattering event associated with the atomic electron.