Photon in a sentence

For the reverse process, there are two possibilities: spontaneous emission of a photon, or the emission of a photon initiated by the interaction of the atom with a passing photon and the return of the atom to the lower-energy state.

When this happens due to the presence of the electromagnetic field from a photon, a photon is released in the same phase and direction as the "stimulating" photon, and is called stimulated emission.

The tiny resonators sitting on top "talk" to each other in a way that allows them to "pluck photon by photon" from this bath, controlling the brightness and bandwidth of the light sent to the PV cell.

After analyzing the light with photon counting techniques, he discovered that the individual bright spots were emitting light at the lowest possible level—a single photon at a time.

To change any facet of its makeup is for the photon to cease to exist and another photon with the new qualities to take its place.

An antimatter -matter powered photon rocket would (disregarding the shielding) obtain the maximum c specific impulse; for this reason, an antimatter-matter annihilation powered photon rocket could potentially be used for interstellar spaceflight.

A single gamma ray photon, for example, might carry ~100,000 times the energy of a single photon of visible light.

A transition from the higher to a lower energy state produces an additional photon with the same phase and direction as the incident photon; this is the process of stimulated emission.

Both the photon count rate and the photon energy are redshifted.

For example, if a single photon strikes the electrons, only a single electron changes states in response to the photon.

For practical applications (e.g. in Monte Carlo codes) it can be interesting to focus on the relation between the frequency of the emitted photon and the angle between this photon and the incident electron.

Hence any light that reaches an outside observer from the photon sphere must have been emitted by objects between the photon sphere and the event horizon.

One half of the beam will reflect, and the other will pass. If the intensity of the beam is reduced until only one photon is in transit at any time, whether that photon will reflect or transmit cannot be predicted quantum mechanically.

The base probability of a photon causing stimulated emission in a single excited atom was shown by Albert Einstein to be exactly equal to the probability of a photon being absorbed by an atom in the ground state.

The critical detail of stimulated emission is that the induced photon has the same frequency and phase as the incident photon.

The directions of the emitted photon and the scattered electron are given by : where is the momentum of the photon.

The emitted photon and the interacting photon then move off in parallel and with matching phases.

The energy of a photon varies only with the frequency of the photon, related by speed of light constant.

The number of electrons also changes because the probability that each photon results in an emitted electron is a function of photon energy.

The photon reflected from phase conjugating mirror (out) has opposite directions of linear and angular momenta with respect to incident photon (in): : Common SHG materials ( Second Harmonic Generation ) Dark-Red Gallium Selenide in its bulk form.