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, the dependence of an acoustically resonant optoacoustic signal on the molecular weight and thermodynamic and transport properpties of the buffer gas is reported.
Abstract: The dependence of an acoustically resonant optoacoustic signal on the molecular weight and thermodynamic and transport properpties of the buffer gas is reported. Our results show that careful selection of such gases can significantly increase the sensitivity and flexibility of optoacoustic spectroscopy. We also demonstrate that such thermodynamic quantities as γ (≡Cp/Cv) and sound velocity can now be measured readily and accurately. Other potential applications are suggested.
29 citations
Patent•
19 Oct 2001
TL;DR: A line-narrowed excimer or molecular fluorine laser system as mentioned in this paper includes a discharge chamber filled with a gas mixture at least including molecular fluorines and a buffer gas, multiple electrodes within the discharge chamber connected to a discharge circuit for energizing the gas mixture, a resonator including a pair of resonator reflecting surfaces disposed on either side of the discharge chamber for generating a laser beam, and a line narrowing/selection unit within the resonator for narrowing the bandwidth of the laser beam.
Abstract: A line-narrowed excimer or molecular fluorine laser system includes a discharge chamber filled with a gas mixture at least including molecular fluorine and a buffer gas, multiple electrodes within the discharge chamber connected to a discharge circuit for energizing the gas mixture, a resonator including a pair of resonator reflecting surfaces disposed on either side of the discharge chamber for generating a laser beam, and a line-narrowing/selection unit within the resonator for narrowing the bandwidth of the laser beam. The resonator further includes a third reflecting surface which is deformable and disposed between the pair of resonator reflecting surfaces. The line-narrowing/selection unit preferably includes a beam expander and a dispersive element, wherein the deformable third reflecting surface is disposed between the beam expander and the dispersive element.
29 citations
TL;DR: The first studies of magnetic decoupling of the spin relaxation of alkali-metal atoms due to binary collisions with buffer gases are reported, with a new "Carver rate" Gamma(C), due to the pressure-shift interaction deltaAI.S, which can substantially broaden the magneticDecoupling curve while having no influence on the zero-field rates.
Abstract: We report the first studies of magnetic decoupling of the spin relaxation of alkali-metal atoms due to binary collisions with buffer gases. When binary collisions are the dominant relaxation mechanism, the relaxation and its magnetic decoupling are well described by the S-damping rate Gamma(SD) due to the spin-rotation interaction gammaN.S, the spin exchange rate Gamma(EX) for collisions between alkali atoms, and a new "Carver rate" Gamma(C), due to the pressure-shift interaction deltaAI.S, which can substantially broaden the magnetic decoupling curve while having no influence on the zero-field rates.
29 citations
TL;DR: Helium buffer gas continuously infused into the analyzer region at pressures of typically 1 x 10(-3) Torr to improve ion trap performance can collisionally quench photoexcited ions during the IRMPD process.
Abstract: Previous infrared multiphoton dissociation (IRMPD) experiments utilizing a quadrupole ion trap mass spectrometer yielded limited photodissociation efficiencies. Helium buffer gas continuously infused into the analyzer region at pressures of typically 1 x 10(-3) Torr to improve ion trap performance can collisionally quench photoexcited ions during the IRMPD process. Photodissociation experiments have indicated that uncorrected pressures below 2 x 10(-5) Torr are necessary to avoid collisional deactivation of photoexcited ions. This paper describes IRMPD in the quadrupole ion trap at reduced pressures utilizing a dual-pulsed introduction of helium buffer gas incorporated into the ion trap scan function. The pulsed introduction of helium buffer gas before ion injection allows the efficient trapping of ions injected from an electrospray source and the removal of helium before laser irradiation. A second pulse of helium directly before ion detection improves the intensity of the ion signal. The use of this dual-pulsed inlet of helium for improved IRMPD is demonstrated with the carbohydrate antibiotics neomycin and erythromycin. Copyright 2000 John Wiley & Sons, Ltd.
29 citations
TL;DR: In this paper, C 60 was synthesized using 500 ms CO 2 laser pulses to irradiate graphite in the presence of a buffer gas (He, Ar or N 2 ) at room temperature.
29 citations