Buffer gas

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

Detection of atomic oxygen and nitrogen created in a radio-frequency-driven micro-scale atmospheric pressure plasma jet using mass spectrometry

Abstract: In this paper we show mass spectrometry results for a radio-frequency-driven micro-atmospheric pressure plasma jet (?-APPJ) discharge obtained using a mass analyzer with triple differential pumping allowing us to sample directly in ambient atmospheric pressure environment (Hiden HPR-60). The flow of the buffer gas (mixture of helium and 1% oxygen) was 2?slm and 3?slm and the excitation frequency was 13.56?MHz. We monitored production of atomic oxygen and nitrogen in the plasma for different flows and powers given by the RF power supply. These measurements were made for energies of electrons emitted from the ionization filament below the threshold for dissociation of O2 and N2. In addition to oxygen and nitrogen atoms, yields for O2, N2, NO and O3 are recorded for different powers and gas flows. It is shown that the ?-APPJ is symmetrical and operates in ?-mode. The power transmitted to the discharge was below 5?W in all measurements.

Method and apparatus for the production of nitrogen for use as an inert gas

Abstract: An arrangement for the production of nitrogen to be used as an inert gas in which carbon dioxide and water vapor are separated from a gas mixture consisting essentially of nitrogen and carbon dioxide. Two tanks connected in parallel have molecular beds through which the gas mixture is passed alternatingly. When the gas mixture is passed through one tank for adsorption purposes, then the other tank is being desorbed by a gas stream leaving the first tank and consisting of nitrogen. The stream of gas through a tank during the desorption phase is opposite to the direction of the gas flow during the adsorption phase.

Narrow Hyperfine Absorption Lines of Cs 133 in Various Buffer Gases

Abstract: Line widths as narrow as 40 cps have been obtained for the hyperfine transition at 9192 Mc/sec in cesium vapor. The Doppler width was greatly reduced by collisions with an inert buffer gas. An optical detection method was used to observe the microwave absorption lines. Shifts in the observed frequency due to collisions with the buffer gas were measured as a function of the temperature and pressure of the gas. It was found possible to reduce greatly the shift in frequency wtth temperature by using the proper mixtures of inert gases. The contribution to line width due to collisions with the buffer gas was nlso determined. (auth)