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This process is known as stimulated emission. In a group of such atoms, if the number of atoms in the excited state is given by N 2, the rate at which stimulated emission occurs is given by = = where the proportionality constant B 21 is known as the Einstein B coefficient for that particular transition, and ρ(ν) is the radiation density of ...
Schematic diagram of atomic stimulated emission. Stimulated emission (also known as induced emission) is the process by which an electron is induced to jump from a higher energy level to a lower one by the presence of electromagnetic radiation at (or near) the frequency of the transition. From the thermodynamic viewpoint, this process must be ...
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Stimulated emission depletion (STED) microscopy is one of the techniques that make up super-resolution microscopy. It creates super-resolution images by the selective deactivation of fluorophores , minimizing the area of illumination at the focal point, and thus enhancing the achievable resolution for a given system. [ 1 ]
Maser-like stimulated emission has also been observed in nature from interstellar space, and it is frequently called "superradiant emission" to distinguish it from laboratory masers. Such emission is observed from molecules such as water (H 2 O), hydroxyl radicals ( •OH ), methanol (CH 3 OH), formaldehyde (HCHO), silicon monoxide (SiO), and ...
Within each sub-level group, fast transitions ensure that thermal equilibrium is reached quickly. Stimulated emissions between upper and lower groups, essential for gain, require the upper levels to be more populated than the corresponding lower ones. This situation is called population-inversion.
Glomus type I cells are peripheral chemoreceptors which sense the oxygen, carbon dioxide and pH levels of the blood. When there is a decrease in the blood's pH , a decrease in oxygen (pO 2 ), or an increase in carbon dioxide ( pCO 2 ), the carotid bodies and the aortic bodies signal the dorsal respiratory group in the medulla oblongata to ...
Stimulated emission is a process by which a group of atoms are moved into higher energy levels (above thermal equilibrium) and then stimulated to release that extra energy all at once. Such population inversions can occur naturally to produce astrophysical masers , which are sources of very intense radiation of specific spectral lines .