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 paper, a pulsed ion beam from an external source is injected into a Penning trap and accumulated by repeatedly lowering during ion capture to prevent the ions already captured from escaping.
62 citations
Patent•
31 Aug 1994TL;DR: In this article, an excimer gas laser using a fluorine/krypton/neon gas mixture is provided with separate fluorine and krypton-neon (34) gas sources for use in replenishing the gas mixture.
Abstract: An excimer gas laser using a fluorine/krypton/neon gas mixture is provided with separate fluorine/neon (32) and krypton/neon (34) gas sources for use in replenishing the gas mixture. A bleed-down (36) mechanism is also provided for draining a portion of the gas mixture from the excimer laser. A control mechanism (44) controls operation of the separate fluorine/neon (32) and krypton/neon (34) source and the bleed-down (36) mechanism to selectively vary the gas mixture within the excimer laser to maintain an overall optimal laser efficiency. Preferably, the control system (44) monitors operational parameters of the excimer laser including gain, wavelength, bandwidth and pulse rate, to determine whether the gas mixture within the excimer laser may have changed from an optimal mixture. The control system controls operation of the separate fluorine/neon and krypton/neon sources to compensate for changes in the operation parameters of the laser to thereby maintain high overall laser efficiency. Alternatively, gas replenishment is controlled subject to pre-determined empirically-based gas replenishment strategies.
62 citations
TL;DR: In this article, a model was used to quantify the impact of buffer gas on the energy and the incidence angle distributions of the deposited W and Se atoms, depending on the efficiency of the preferential sputtering of Se atoms.
61 citations
TL;DR: The effects of buffer gas pressure on ion trap stability, mass resolution/calibration, and choice of mass scanning are described and pressure effects were treated phenomenologically by adding a drag term to the ion equations of motion.
Abstract: The effects of buffer gas pressure on ion trap stability, mass resolution/calibration, and choice of mass scanning are described. Pressure effects were treated phenomenologically by adding a drag term to the ion equations of motion. The resulting collisional damping enlarges the mass-dependent stability region but reduces the region in which mass-selective resonance ejection can be performed. The pressure effects can be reduced by increasing the frequency of the alternating quadrupole field.
61 citations
TL;DR: In this paper, the group time delay for a light pulse propagating through hot {sup 87}Rb vapor in the presence of a strong coupling field in a {lambda} configuration was investigated.
Abstract: We experimentally study the group time delay for a light pulse propagating through hot {sup 87}Rb vapor in the presence of a strong coupling field in a {lambda} configuration. We demonstrate that the ultraslow pulse propagation is transformed into superluminal propagation as the one-photon detuning of the light increases due to the change in the transmission resonance line shape. Negative group velocity as low as -c/10{sup 6}=-80 m/s is recorded. We also find that the advance time in the regime of the superluminal propagation grows linearly with increasing laser field power.
60 citations