Topic
Buffer gas
About: Buffer gas is a research topic. Over the lifetime, 3565 publications have been published within this topic receiving 47283 citations.
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TL;DR: In this article, the instability threshold characteristics for the ring cavity with passive weakly absorbing two-level atoms cell were derived, and several conical shells were predicted, depending on the optical arrangement, and on the buffer gas pressure.
22 citations
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07 Jun 2000TL;DR: In this article, a multi-pole ion trap is developed where ions are weakly bound with confining fields that are effectively zero through the trap interior and grow rapidly near the trap electrode walls.
Abstract: Buffer gas cooled clocks rely on large numbers of ions, typically /spl sim/10/sup 7/, optically pumped by a discharge lamp at scattering rates of a few photons per second per ion. To reduce the second-order Doppler shift from space charge repulsion of ions from the trap node line, novel multi-pole ion traps are now being developed where ions are weakly bound with confining fields that are effectively zero through the trap interior and grow rapidly near the trap electrode walls.
22 citations
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TL;DR: In this paper, the effect of different cell geometries on the intensity of the produced molecular beam, using ammonia as a test molecule, was evaluated using flow field simulations for the different buffer-gas cell geometry.
Abstract: We have designed, constructed, and commissioned a cryogenic helium buffer-gas source for producing a cryogenically cooled molecular beam and evaluated the effect of different cell geometries on the intensity of the produced molecular beam, using ammonia as a test molecule Planar and conical entrance and exit geometries are tested We observe a threefold enhancement in the ${\mathrm{NH}}_{3}$ signal for a cell with planar entrance and conical-exit geometry, compared to that for a typically used ``boxlike'' geometry with planar entrance and exit These observations are rationalized by flow field simulations for the different buffer-gas cell geometries The full thermalization of molecules with the helium buffer gas is confirmed through rotationally resolved resonance-enhanced multiphoton ionization spectra yielding a rotational temperature of 5 K
22 citations
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27 Aug 2004
TL;DR: In this article, a method of growing a crystal on a substrate disposed in a reactor, that provides a reactor chamber in which the substrate is disposed, includes flowing reactive gases inside the reactor chamber toward the substrate, the reactive gases comprising components that are able to bond to each other to form the crystal, and flowing buffer gas in the reactor between reactive gases and a wall of the reactor.
Abstract: A method of growing a crystal on a substrate disposed in a reactor, that provides a reactor chamber in which the substrate is disposed, includes flowing reactive gases inside the reactor chamber toward the substrate, the reactive gases comprising components that are able to bond to each other to form the crystal, and flowing buffer gas in the reactor chamber between the reactive gases and a wall of the reactor, where the flowing buffer gas inhibits at least one of a first material at least one of in and produced by the reactive gases from reaching the reactor wall and a second material produced by the reactor wall from reaching the reactive gases in the reactor chamber before the reactive gases reach the substrate.
22 citations
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23 Sep 1977
TL;DR: In this paper, a high power gas dynamic mixing laser capable of having an energizing gas formed by an exothermic decomposition process is described, which includes a housing having a reaction chamber in which an excitation gas is formed by thermal decomposition of a starting material.
Abstract: A high power gas dynamic mixing laser capable of having an energizing gas formed by an exothermic decomposition process is disclosed. The laser includes a housing having a reaction chamber in which an excitation gas is formed by thermal decomposition of a starting material, a nozzle connected to the housing for expanding the excitation gas to supersonic velocity, means for injecting a lasing gas into the supersonic stream of excitation gas to produce an inversion of populated energy levels of the lasing gas, optical means for extracting a laser beam and exhaust means for passing the gas mixture to the atmosphere. An embodiment of the present invention includes a return duct attached at one end to the exhaust means and at the other end to the housing for circulating the gas through the laser and a lasing gas capable of thermal decomposition downstream the optical means to form the excitation gas.
22 citations