Photon energy is the energy carried by a single photon. The amount of energy is directly proportional to the photon's electromagnetic frequency and thus...

itself is made of discrete units of energy. In 1926, Gilbert N. Lewis popularized the term photon for these energy units. Subsequently, many other experiments...

wavelengths less than 10 picometers (1×10−11 m), gamma ray photons have the highest photon energy of any form of electromagnetic radiation. Paul Villard,...

physical constant of foundational importance in quantum mechanics: a photon's energy is equal to its frequency multiplied by the Planck constant, and the...

high photon energy is able to ionize atoms, causing chemical reactions. Longer-wavelength radiation such as visible light is nonionizing; the photons do...

and n2 = ∞ (principal quantum number of the energy level the electron descends from, when emitting a photon). The Rydberg formula was derived from empirical...

specifically to a photon creating an electron–positron pair near a nucleus. As energy must be conserved, for pair production to occur, the incoming energy of the...

classical electromagnetic waves into particles called photons. Photons are massless particles of definite energy, definite momentum, and definite spin. To explain...

ground state), via a virtual energy level, to a higher energy, most commonly an excited electronic state. Absorption of two photons with different frequencies...

individual photons. By keeping track of the deposited energy in each interaction, the detector pixels of a PCD each record an approximate energy spectrum...

expected deflection angle decrease with increasing photon energy. For an incident unpolarized photon of energy E γ {\displaystyle E_{\gamma }} , the differential...

When a high frequency photon scatters due to an interaction with a charged particle, there is a decrease in the energy of the photon (and thus, an increase...

gravitational-wave energy. Because electromagnetic (EM) radiation can be conceptualized as a stream of photons, radiant energy can be viewed as photon energy – the...

Photon counting is a technique in which individual photons are counted using a single-photon detector (SPD). A single-photon detector emits a pulse of...

range of 30 petahertz to 30 exahertz (3×1016 Hz to 3×1019 Hz) and photon energies in the range of 100 eV to 100 keV, respectively. X-rays can penetrate...

material absorbs the energy of a photon and acquires more energy than its binding energy, it is likely to be ejected. If the photon energy is too low, the...

Another way of characterizing the radiance distribution is via the mean photon energy ⟨ E phot ⟩ = π 4 30 ζ ( 3 ) k T ≈ ( 3.7294 × 10 − 23 J / K ) ⋅ T , {\displaystyle...

equation in quantum mechanics which states that the energy E of a photon, known as photon energy, is proportional to its frequency ν: E = h ν . {\displaystyle...

of cells activated by the shower, providing information about the photon's energy and position. At ALICE experiment, PMD was used to measure the multiplicity...

would decay by photon emission, producing tube discharge. However, effective quencher molecules, when excited, lose their energy not by photon emission, but...

classical electromagnetism. It is the low-energy limit of Compton scattering: the particle's kinetic energy and photon frequency do not change as a result of...

Photon polarization is the quantum mechanical description of the classical polarized sinusoidal plane electromagnetic wave. An individual photon can be...

the energy distribution is established by the interaction of the photons with matter, usually the walls of the container, and the number of photons is...

source of gravitation is the stress–energy tensor, a second-order tensor (compared with electromagnetism's spin-1 photon, the source of which is the four-current...

center-of-mass energy of the system of the two photons, matter can be created. Photon–photon interactions limit the spectrum of observed gamma-ray photons at moderate...

Ultra-high-energy gamma rays are gamma rays with photon energies higher than 100 TeV (0.1 PeV). They have a frequency higher than 2.42 × 1028 Hz and a...

device's efficiency at each photon energy level. For typical semiconductor photodetectors, QE drops to zero for photons whose energy is below the band gap....

photon upconversion occurs through energy transfer upconversion (ETU), excited-state absorption (ESA) and photon avalanche (PA). Such processes can be...

are also massless particles carrying energy – photon energy. The amount of energy per single gluon, or "gluon energy", directly measured, though a distribution...

type of electromagnetic radiation that does not carry enough energy per quantum (photon energy) to ionize atoms or molecules—that is, to completely remove...