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Buffer gas

About: Buffer gas is a research topic. Over the lifetime, 3565 publications have been published within this topic receiving 47283 citations.


Papers
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Patent
26 Apr 2001
TL;DR: In this article, a non-contacting gas compressor seal assembly with an intermediate buffer chamber is described, which is designed to maintain a sealing relationship in the event of loss of buffer gas pressure by operating as a noncontacting seal on the process fluid.
Abstract: A non-contacting gas compressor seal assembly is disclosed with an intermediate buffer chamber. The process gas is corrosive or otherwise hazardous and is contained from entering the atmosphere by pumping the barrier gas toward the process fluid. The inboard seal of the assembly is designed to maintain a sealing relationship in the event of loss of buffer gas pressure by operating as a non-contacting seal on the process fluid.

19 citations

Journal ArticleDOI
TL;DR: In this article, a single-photon dissociation of (CH3)2Zn has been examined at 248 nm in the gas phase and the relative yields of CH3Zn and Zn as a function of buffer gas pressure were determined by laser-induced fluorescence.
Abstract: Single‐photon dissociation of (CH3)2Zn has been examined at 248 nm in the gas phase. The relative yields of CH3Zn and Zn as a function of buffer gas pressure were determined by laser‐induced fluorescence. With He as the buffer gas, the yield of CH3Zn increases from ∼20% at very low pressure to ∼65% at 500 Torr. The yield of Zn atoms correspondingly drops over the same pressure range. This behavior is due to the increasing probability for collisional stabilization of the primary photoproduct, vibrationally hot CH3Zn, as the buffer gas pressure increases, thereby quenching its subsequent thermal dissociation to CH3 and Zn. Information on the nascent vibrational energy distribution of the CH3Zn photoproduct is obtained by examining the probability of CH3Zn stabilization vs buffer gas pressure.

19 citations

Journal ArticleDOI
TL;DR: In this article, the role of buffer gas in both the optical pumping and the spin transfer to free electrons was investigated. But the experimental demonstration of an optically pumped electron spin filter was not presented.
Abstract: This paper reports the first experimental demonstration of an optically pumped electron spin filter. Unpolarized electrons produced in a cold-cathode discharge drift through a mixture of spin-polarized Rb and a nitrogen or helium buffer gas. Through spin-exchange collisions with the Rb, the drifting electrons become polarized along the optical pumping axis. We study the role of the buffer gas in both the optical pumping and the spin transfer to the free electrons. This spin filter produces electron beams with currents and polarizations comparable to first-generation GaAs polarized electron sources.

19 citations

Journal ArticleDOI
TL;DR: In this article, the authors present a tutorial on radiofrequency ion trapping in multipole electrode configurations and discuss stable trapping conditions and buffer gas cooling, as well as important heating mechanisms, in addition to selected experimental studies on cation and anion-molecule reactions and on spectroscopy of trapped ions.
Abstract: Multipole radiofrequency ion traps are a highly versatile tool to study molecular ions and their interactions in a well-controllable environment. In particular the cryogenic 22-pole ion trap configuration is used to study ion-molecule reactions and complex molecular spectroscopy at temperatures between few Kelvin and room temperatures. This article presents a tutorial on radiofrequency ion trapping in multipole electrode configurations. Stable trapping conditions and buffer gas cooling, as well as important heating mechanisms, are discussed. In addition, selected experimental studies on cation and anion-molecule reactions and on spectroscopy of trapped ions are reviewed. Starting from these studies an outlook on the future of multipole ion trap research is given.

19 citations

Journal ArticleDOI
TL;DR: In this paper, the operating characteristics of hollow-cathode laser systems are investigated, including the output power, gain and threshold current on the cathode length, composition of buffer gas, and mirror transmission.
Abstract: Operating characteristics of silver, gold and copper vapor hollow-cathode lasers are presented. Dependence of the output power, gain and threshold current on the cathode length, composition of the buffer gas, and mirror transmission is described. Studies of multicomponent hollow cathodes which produce laser lines of several elements simultaneously are also presented.

19 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202329
202264
202136
202062
201967
201891