Buffer gas

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

Effects of H2 buffer gas additive on repetition rate scaling of a copper vapour laser

Abstract: The variations in the output power of a copper vapour laser resulting from H2 additive to neon buffer gas are investigated for a wide range of pulse repetition frequencies (3.2 to 19.7 kHz). Small improvements in laser output power (9%) were observed for ∼2% H2-Ne admixture at low repetition frequency, these improvements becoming progressively larger (up to 250%) as the repetition rate increased. These observations are consistent with added H2 modifying the interpulse kinetics, thereby altering the spatiotemporal evolution of the output pulse. In particular, the observed average output power increases at elevated repetition rates owing to both increased laser pulse energy and increased optimum pulse repetition frequency.

Rate constants for the gas phase reaction of chloride ion with methyl bromide over the pressure range 300 to 1100 torr

Abstract: Rate constants for the reaction of chloride ion with methyl bromide have been determined over a range of buffer gas pressures from 300 to 1100 Torr at 125 °C by ion mobility spectrometry (IMS). The rate constants were found to increase slightly with increased pressure over this range and also increased slightly with a change from nitrogen to methane buffer gas. Parallel measurements for the reaction of chloride ion with n-butyl bromide indicated no dependence of the observed rate constants on changes in the pressure or identity of the buffer gas, as expected. The present measurements indicate that the high-pressure limit (HPL) of kinetic behavior is not achieved for the Cl-/CH3Br reaction system by use of buffer gases in the near-atmospheric pressure range and are consistent with a recent suggestion by Seeley et al. that this reaction should occur with near-collision frequency in its high-pressure limit.

Kinetic studies of ionic excimers

Abstract: Ionic excimers are potential candidates for storage media in vacuum ultraviolet (VUV) lasers. In order to study their production mechanisms the VUV fluorescence was observed after exciting corresponding gas mixtures by an intense coaxial electron beam. The deposited energy was increased up to 100 mJ/cm3 bar (Ar). Out of three classes of ionic excimers the species Ar2+2 (190 nm), Ne+Kr (166, 184 nm), and Kr+K (135 nm) were studied in detail. In the case of Kr+K buffer gas He with a pressure up to 30 bar was added in order to increase the fluorescence intensity. Measurements were performed at various gas densities. At optimum conditions with respect to the quantum efficiency ηQ, values of ηQ=8.5×10−2, 4×10−2, and 3×10−2, respectively, were determined. At pumping densities in the order of 10 mJ/cm3 the quantum yield already decreases. The maximum achievable fluorescence energy was found to be 40, 30, and 10 μJ/cm3, respectively. By comparing the results with predictions of rate equation models rate constants...