Cs-K-Sb photocathode centered on a Molybdenum plug (a) after growth in the preparation chamber and (b) after transfer into the photoinjector
A photocathode is a surface engineered to convert light (photons) into electrons using the photoelectric effect. Photocathodes are important in accelerator physics where they are utilised in a photoinjector to generate high brightness electron beams. Electron beams generated with photocathodes are commonly used for free electron lasers and for ultrafast electron diffraction. Photocathodes are also commonly used as the negatively charged electrode in a light detection device such as a photomultiplier, phototube and image intensifier.
A photocathode is a surface engineered to convert light (photons) into electrons using the photoelectric effect. Photocathodes are important in accelerator...
other vacuum tubes), containing a photocathode, several dynodes, and an anode. Incident photons strike the photocathode material, which is usually a thin...
source enter an objective lens which focuses an image into a photocathode. The photocathode releases electrons via the photoelectric effect as the incoming...
electric field generation (DC or RF), by emission mechanism (thermionic, photocathode, cold emission, plasmas source), by focusing (pure electrostatic or with...
(PMTs): PMTs are vacuum tube-based photodetectors. They consist of a photocathode that emits electrons when illuminated, followed by a series of dynodes...
emitted. These are extremely light-sensitive vacuum tubes with a coated photocathode inside the envelope. The photo cathode contains combinations of materials...
In a photomultiplier tube, one or more electrons are emitted from a photocathode and accelerated towards a polished metal electrode (called a dynode)...
energy deposited by the ionizing particle. These can be directed to the photocathode of a photomultiplier tube which emits at most one electron for each arriving...
strikes the photocathode and on a wavelength the human eye can see. This is much like a CRT television, but instead of color guns the photocathode does the...
instabilities. Ultraviolet can be detected by suitable photodiodes and photocathodes, which can be tailored to be sensitive to different parts of the UV...
television sets. In a photomultiplier tube, every photon striking the photocathode initiates an avalanche of electrons that produces a detectable current...
This is also part of traditional television and computer screens. Photocathodes may also be built in as a part of an electron gun, using the photoelectric...
dissector is a camera tube that creates an "electron image" of a scene from photocathode emissions (electrons) which pass through a scanning aperture to an anode...
Such an arrangement is able to amplify the tiny current emitted by the photocathode, typically by a factor of one million. The electrons emitted from the...
traversed by the X-ray beam. Transmitted intensities now fall on the photocathode stimulating it to produce electrons in quantities external to the light...
p+/p-Si photocathode, the main product is formic acid with small amount of formaldehyde and methanol. However, for p-InP and p-CdTe photocathode, both carbon...
photocathodes used in solar blind photomultiplier tubes and for high brightness photoinjectors driving modern particle accelerators. The photocathode...
iodide (CsI). When hit by X-rays material phosphors which causes the photocathode adjacent to it to emit electrons. These electrons are then focused using...
light intensifiers or infrared vision. The former technology uses a photocathode to convert light (in the visible or near infrared portions of the electromagnetic...
image intensifier tube found in fluoroscopy equipment. Caesium iodide photocathodes are highly efficient at extreme ultraviolet wavelengths. Bulk caesium...
The FUV detector consists of a CsI photocathode with a MgF2 input optic, the NUV detector consists of CsTe photocathode with a fused-silica input optic and...
research, as well as material characterization. A photoinjector comprises a photocathode, electron gun (AC or DC), power supplies, driving laser system, timing...
principle of secondary emission, whereby a single electron emitted by the photocathode strikes a special sort of anode known as a dynode causing more electrons...
can be applied generally, photoanodes and photocathodes have slightly different needs. A good photocathode will have early onset of the oxygen evolution...
near-infrared, silicon enables much higher quantum efficiency than available PMT photocathode materials. Dynamic range can be orders of magnitude larger than a PMT...
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