Photon collision Definition and 12 Threads

Two-photon physics, also called gamma–gamma physics, is a branch of particle physics that describes the interactions between two photons. Normally, beams of light pass through each other unperturbed. Inside an optical material, and if the intensity of the beams is high enough, the beams may affect each other through a variety of non-linear effects. In pure vacuum, some weak scattering of light by light exists as well. Also, above some threshold of this center-of-mass energy of the system of the two photons, matter can be created.

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  1. Kyran

    B Why are things the color they are?

    I have not noticed anything in common between all things that are the same color. It must be something on the atomic level but if I look at the periodic table I see no pattern in how things behave and what their color is. So how can the sun be the same color as a highlighter and plastic the same...
  2. F

    I Measurement of a particle's position using photons

    I've read that a particle's position can be measured by firing a photon at it, but how does one actually determine the position of the particle by doing this? What is the maths behind it (is it calculated from momentum conservation)? Furthermore, I've read that increasing the energy of the...
  3. S

    I Can black holes split photons into elementary particles?

    Hello all, Is this a thing? I understand that a theory of quantum gravity is necessary to explain the physics at the core of a black hole, but it seems a black hole is the only environment energetic and dense enough to ignite a mass-energy feedback loop where colliding photons release the...
  4. P

    What is the collision probability for an energetic photon in free space?

    Hi. Does anyone know the probability of an energetic photon interacting with ions in free space if we know the ion gas density and the photons wavelength? I'm trying to find out if the energetic photon is treated like a particle where its size is relative to it's wavelength. In other words, is...
  5. J

    Calculate muon speed after collision

    Homework Statement Two equal energy photons collide head on and annihilate each other, producing a u+, u- pair. The two particles have equal mass, about 207 times the electron mass. A) Calculate the maximum wavelength of the photons for this to occur. B) If the wavelength calculated in A) is...
  6. J

    Muon Speed Calculation After Photon Collision

    Homework Statement Two equal-energy photons collide head-on and annihilate each other, producing a u+ and u- pair. The muon mass is about 207 times the electron mass. Calculate the maximum wavelength of the photons for this to occur. If the photons have this wavelength, describe the motion of...
  7. B

    What is the role of photon-photon collisions in the creation of the universe?

    Photon collision physics? Can anybody explain the physics behind the collision of two photons if they do collide, also what are the phenomenon which arise due to this collision, do such collisions have any impact in experiments in quantum physics involving photons!
  8. A

    Can Photon Collisions Predict Particle Creation and Energy Limits?

    I have a few questions regarding matter creation and photon collisions. When photons collide into each other, can you predict the particles that are created? Is there a limit to the amount of energy photons can carry? Is there a limit to the number of particles that two photons can make after a...
  9. K

    High energy free electron and low energy photon collision

    please feel free to correct me on any of this. is it possible for a high energy free electron to collide with a low energy photon? If so, what happens? And can this be replicated in a laboratory setting?
  10. P

    Photon collision with H2 molecule

    Homework Statement A photon of a given wavelength "lambda" collides with a hydrogen molecule that's initially at rest (photon is absorbed by H2). Assuming absorption event conserves momentum, find velocity and translational energy of H2 after the event. Homework Equations momentum of...
  11. M

    Colliding Photons: Matter-Energy Problems & Wavefunction

    whilst we are successful in colliding matter to identify yet further fundamental particles, and being aware there is a limit on speed due to mass end energy problems, and given that matter and mass are interchangeable, might it be possible to collide a single photon with another (this must rely...
  12. U

    What happens to the remaining energy in the neutron?

    I am to calculate everything in a non-relativistic state: a 15MeV photon is completely absorbed in colliding with a neutron initially at rest. Determine the speed of the neutron: conservation of momentum: E=\frac{hc}{\lambda} 15MeV=\frac{1240MeV nm}{\lambda} \lambda=8.2667x10^{-5}nm...
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