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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Patent•
10 Jun 1981
TL;DR: In this paper, a new and improved thermodynamic device to produce hydrogen gas and oxygen gas from ordinary water molecules or from seawater at normal temperatures and pressure was presented, and a new method for electrically treating water molecules to decompose them into hydrogen and oxygen at efficiency levels ranging between approximately 80-100%.
Abstract: Disclosed herein is a new and improved thermodynamic device to produce hydrogen gas and oxygen gas from ordinary water molecules or from seawater at normal temperatures and pressure. Also disclosed is a new and improved method for electrically treating water molecules to decompose them into hydrogen gas and oxygen gas at efficiency levels ranging between approximately 80-100%. The evolved hydrogen gas may be used as a fuel; and the evolved oxygen gas may be used as an oxidant.
35 citations
35 citations
TL;DR: In this paper, the authors demonstrate buffer-gas cooling, high-resolution spectroscopy and cycling fluorescence of cold barium monofluoride (BaF) molecules.
Abstract: We demonstrate buffer-gas cooling, high-resolution spectroscopy and cycling fluorescence of cold barium monofluoride (BaF) molecules. Our source produces an intense and internally cold molecular beam containing the different BaF isotopologues with a mean forward velocity of 190 m/s. For a well-collimated beam of 138BaF we observe a flux of more than 1e10 molecules/sr/pulse in the X2Sigma, N=1 state in our downstream detection region. Studying the absorption line strength of the intermediate A'Delta state we infer a lifetime of 790+\-346 ns, significantly longer than previously estimated. Finally, highly-diagonal Franck-Condon factors and magnetic remixing of dark states allow us to realize a quasi-cycling transition in 138BaF that is suitable for future laser cooling of this heavy diatomic molecule.
35 citations
TL;DR: In this paper, a time-resolved system is described which can produce qualitative and semi-quantitative spectroscopic information using a single laser plasma, which is used for atomization, ionization, and excitation of elements in solid samples.
Abstract: A laser-induced plasma is used for atomization, ionization, and excitation of elements in solid samples. The analytes are placed in a variable-pressure chamber in which the surrounding gas can be modified to obtain optimum emission characteristics for a particular sample. A time-resolved system is described which can produce qualitative and semi-quantitative spectroscopic information using a single laser plasma. The effects of the plasma position relative to the sample, the chamber pressure, and the characteristics of the surrounding gases are studied. When helium was employed as the buffer gas, maximum emission intensity for the aluminum ionic transition at 281.6 nm was observed. The spectra obtained show that it is possible to obtain qualitative spectroscopic information with the formation of single plasmas by the use of time resolution. It is also demonstrated that sample excitation can be achieved directly by the plasma and indirectly by energy transfer from gases in the chamber. This method allows the use of small sample quantities with little sample preparation and is especially advantageous for solid samples which are not easily dissolved.
35 citations
TL;DR: In this paper, a combined experimental and theoretical study of beam formation from a cryogenic buffer gas cell is presented, where atoms and molecules are loaded into the cell by laser ablation of a target, and are cooled and swept out of the cell with a flow of cold helium.
Abstract: We present a combined experimental and theoretical study of beam formation from a cryogenic buffer gas cell. Atoms and molecules are loaded into the cell by laser ablation of a target, and are cooled and swept out of the cell by a flow of cold helium. We study the thermalization and flow dynamics inside the cell and measure how the speed, temperature, divergence and extraction efficiency of the beam are influenced by the helium flow. We use a finite element model to simulate the flow dynamics and use the predictions of this model to interpret our experimental results.
35 citations