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Spontaneous emission is the process by which a light source such as an atom, molecule, nanocrystal or nucleus in an excited state undergoes a transition to a state with a lower energy, e. g., the ground state and emits a photon.
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Spontaneous and emission
Spontaneous emission of light or luminescence is a fundamental process that plays an essential role in many phenomena in nature and forms the basis of many applications, such as fluorescent tubes, older television screens ( cathode ray tubes ), plasma display panels, lasers ( for startup-normal continuous operation works by stimulated emission instead ) and light emitting diodes.
Spontaneous emission in free space depends upon vacuum fluctuations to get started.
* Spontaneous emission
The initial spontaneous emission is therefore amplified in the same manner as the signals, hence the term Amplified Spontaneous Emission.
) Spontaneous emission gives the laser diode below lasing threshold similar properties to an LED.
Spontaneous emission is necessary to initiate laser oscillation, but it is one among several sources of inefficiency once the laser is oscillating.
Spontaneous emission from can result in an atom being in this dark state or another coherent state, known as a bright state.
* Spontaneous emission
# REDIRECT Spontaneous emission
# REDIRECT Spontaneous emission
Spontaneous emission is the process by which an electron " spontaneously " ( i. e. without any outside influence ) decays from a higher energy level to a lower one.
Spontaneous and is
Spontaneous combustion is the self-ignition of a mass, for example, a pile of oily rags.
Spontaneous Combustion is also the name of:
Spontaneous transitions was not explainable within the framework of the old quantum theory, that is a theory in which the atomic levels are quantized, but the electromagnetic field is not.
Spontaneous realization on the basis of transmission is possible but rare.
The principal source of noise in DFAs is Amplified Spontaneous Emission ( ASE ), which has a spectrum approximately the same as the gain spectrum of the amplifier.
Spontaneous language is lacking and their pragmatic speech is delayed.
Spontaneous pain or allodynia ( pain resulting from a stimulus which would not normally provoke pain, such as a light touch of the skin ) is not limited to the territory of a single peripheral nerve, and is disproportionate to the inciting event.
In the 1984 mockumentary This Is Spinal Tap, Spontaneous Human Combustion is included as the cause of death of one of the band's numerous former drummers.
Spontaneous Raman scattering is typically very weak, and as a result the main difficulty of Raman spectroscopy is separating the weak inelastically scattered light from the intense Rayleigh scattered laser light.
Spontaneous division of the zygote into two embryos is not considered to be a hereditary trait, but rather a spontaneous or random event.
Spontaneous deamination is the hydrolysis reaction of cytosine into uracil, releasing ammonia in the process.
* Spontaneous bacterial peritonitis ( SBP ) is a peculiar form of peritonitis occurring in the absence of an obvious source of contamination.
Spontaneous abortion is a frequently used clarification to distinguish this natural process from an induced abortion.
Spontaneous abortion occurs in pregnant Prairie Voles when their mate is removed and they are exposed to a new male, an example of the Bruce effect, although this effect is seen less in wild populations than in the laboratory.
Spontaneous and process
* Spontaneous generation-is a principle regarding the origin of life from inanimate matter, which held that this process was a commonplace and everyday occurrence, as distinguished from univocal generation, or reproduction from parent ( s ).
* Spontaneous process
# REDIRECT Spontaneous process
Spontaneous fission became popular soon after its discovery in 1940 by K. Petrzhak and G. Flerov owing to both military and peaceful applications of neutron-induced fission discovered in 1939 by Otto Hahn, Lise Meitner and Fritz Strassmann, employing the large amount of energy released during the process.
Spontaneous and by
Spontaneous mutations on the molecular level can be caused by:
Spontaneous activity in the primary sensory areas may produce hallucinations which are misinterpreted by the secondary areas as information from the real world.
* Spontaneous Combustion ( album ), a 2007 album by Liquid Trio Experiment
* Spontaneous Combustion ( film ), a 1990 film by Tobe Hooper
Spontaneous premature ovarian failure affects 1 % of women by age 40, and 0. 1 % of women by age 30.
The Spontaneous Music Ensemble was formed by John Stevens and Trevor Watts in the mid-1960s and included, at various times, influential players such as Derek Bailey, Evan Parker, Kenny Wheeler, Roger Smith, and John Butcher.
The Spontaneous Music Ensemble ( SME ) was a loose collection of free improvising musicians convened beginning in the mid-1960s by the late South London-based jazz drummer / trumpeter John Stevens and alto and soprano saxophonist Trevor Watts.
* Spontaneous emergence of elementary particles out of the vacuum, as explained by quantum theory, and the equally spontaneous decay of single particles and the mutual annihilation of particles and anti-particles,
* Spontaneous potential, a measurement taken by oil industry well loggers to characterise rock formation properties
Inspired by a thousand-word rambling letter from his friend Neal Cassady, Kerouac in 1950 outlined the " Essentials of Spontaneous Prose " and decided to tell the story of his years on the road with Cassady as if writing a letter to a friend in a form that reflected the improvisational fluidity of jazz.
* Triad ( album ), 1976 album by Spontaneous Combustion
Spontaneous orders are distinguished by being scale-free networks, while organizations are hierarchical networks.
* The Tradition of Spontaneous Order, by Norman Barry, Library of Economics and Liberty
Ferrin's Spontaneous Inventions, directed by Bud Schaetzle, is an hour-long recording of a 1986 performance in Hollywood.
* Performances by the school's improvisation troupe, Spontaneous Generation, and sketch comedy troupe, Nitrous Oxide, and of contemporary musical theater, Cabaret Troupe, in concert style.
* The Spontaneous Expansion of the Church and the Causes which Hinder it., Cambridge: Lutterworth Press, 2006, ISBN 978-0-7188-9171-8 ; foreword by Bishop Michael Turnbull.
The Ojibwe scholar, linguist and author Basil Johnston, who explains the name in a creationist context, states that its literal translation is " Beings Made Out of Nothing ", or " Spontaneous Beings ", since they had been created by divine breath and were made up of flesh and blood and a soul or spirit-instead of rock, or fire, or water, or wind.
* Spontaneous Healing by Andrew Weil
; Spontaneous recovery from extinction and recovery from extinction caused by reminder treatments ( reinstatement )
Spontaneous tōge battles may also be initiated by random encounters between racers on the street.
Finn departed and was replaced for a short period by Paul Entwhistle, also of Liverpool band, Spontaneous Cattle Combustion.
Spontaneous demonstrations broke out in Luxor almost immediately against the terrorists, demanding action by the government and leading to a visit by Mubarak to the region a few days later.
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