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 … See more Quantum Efficiency (QE) Quantum efficiency is a unitless number that measures the sensitivity of the photocathode to light. It is the ratio of the number of electrons emitted to the number of incident … See more For many years the photocathode was the only practical method for converting light to an electron current. As such it tends to function as a form … See more The surface of photocathodes can be characterized by various surface sensitive techniques like scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy See more • Ag-O-Cs, also called S-1. This was the first compound photocathode material, developed in 1929. Sensitivity from 300 nm to 1200 nm. … See more Photocathodes operate in a vacuum, so their design parallels vacuum tube technology. Since most cathodes are sensitive to air the … See more Although a plain metallic cathode will exhibit photoelectric properties, the specialized coating greatly increases the effect. A photocathode usually consists of alkali metals with … See more • Photomultiplier Tubes Basics and Applications from Hamamatsu Photonics See more WebSep 1, 2024 · NEA GaN-based photocathode has important application prospects in the vacuum electron source and ultraviolet detection due to its direct wide bandgap, high quantum efficiency, and robust characteristics. In the recent 20 years, research on the NEA GaN photocathode has been extensively explored. Herein, we pr Journal of Materials …
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WebJun 6, 2024 · A photocathode is a negatively charged electrode in a light detection device such as a photomultiplier or phototube that is coated with a photosensitive compound. … WebJan 11, 2024 · Photocathode materials. Ag-O-Cs, also called S-1. This was the first compound photocathode material, developed in 1929. Sensitivity from 300 nm to 1200 nm. Since Ag-O-Cs has a higher dark current than more modern materials, photomultiplier tubes with this photocathode material are nowadays used only in the infrared region with cooling. dr ganne west long branch nj
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WebSep 23, 2024 · 주사전자현미경 (Scanning Electron Microscope)은 고체 상태에서 작은 크기의 미세 조직과 형상을 관찰할 때 널리 쓰이는 현미경으로서 1965년 최초로 상품화된 후 초점 심도가 깊고 3차원적인 영상의 관찰이 용이해서 복잡한 표면구조나 결정 외형 등의 입체적인 형상을 ... WebA photomultiplier tube (PMT) consists of a photocathode followed by an electron multiplier. A single photon ejects an electron from the photocathode. Electric fields in the PMT accelerate the electron into another surface called a dinode. The collision of the electron with the dinode releases several new electrons, which are accelerated into ... WebThe L-band drive RF photocathode gun produces both single-electron bunches as well as trains of electron bunches spaced at 1.3 GHz. In single-bunch operation, the drive gun produces a wide variety of bunches from 10 pC to 100 nC, a dynamic range of four orders of magnitude. In bunch-train operation, the drive gun produces trains of variable pulse … enphase mtc-mat1-b03