Showing papers on "Buffer gas published in 1968"

EFFICIENT CW LASER OSCILLATION AT 4416 Å IN Cd (II)

Abstract: A gain of 20%/m and a power output of 50 mW have been measured on the 5s2 2D5/2 → 5p2P03/2 4416‐A laser transition in Cd (II) using a single isotope of Cd114. The system was operated in a tubular furnace at temperatures in the range of 200°C with He as a buffer gas. The laser output with respect to He pressure, discharge current, and furnace temperature are discussed along with a proposed excitation mechanism. The system appears to have the prospect of being one of the most efficient, high power lasers operating in the visible region of the spectrum.

Conversion rates and ion mobilities in pure neon and argon afterglow plasmas

Abstract: Measurements have been made at room temperature of the rates of decay of the atomic ion species in afterglow plasmas in pure neon and argon at various pressures within the range 0·01-2 torr. In both gases, the variation of the measured decay rates with pressure, observed over about two orders of magnitude in pressure, is consistent with the loss of the atomic inert gas ions by diffusion to the plasma boundary and by conversion to molecular inert gas ions in three-body reactions with the neutral gas. The present measurements constitute the first observations of the three-body conversion process in argon by a method providing mass identification of the participating ion species. The values obtained for the rates of the conversion reaction in neon and in argon and for the reduced mobilities of the atomic inert gas ions in their pure parent gases are νNe+ = (99±5)po2s-1, νAr+ = (313±12)po2s-1 μNe+ = 4.6±0.4 cm2 V-1s-1, μAr+ = 1.75±0.15) cm2 V-1s-1. These results are compared with the values which have been obtained by other workers and comparisons are also made with the existing theoretical estimates of the measured parameters.

Method and apparatus for gas analysis utilizing a direct current discharge

Abstract: A method and apparatus for spectrochemical analysis of a gas is provided in which the subject gas is mixed with a carrier gas and introduced into an analysis space between two electrodes. A continuous direct current discharge between the electrodes is produced which sustains a plasma formed from the carrier gas so that components of the subject gas are excited to luminescence. Characteristic radiation emitted by the components is then detected. The carrier gas has a higher ionization potential than components of the subject gas and, for example, may be a noble gas. The method is operable at atmospheric pressure. The electrodes may be either solid wires or tubes through which the gas mixture enters and leaves the analysis space.

Optical pumping rates in an alkali vapour in the presence of a buffer gas

Abstract: General equations are derived for the computation of 〈Fz〉 in an alkali vapour submitted to optical pumping withD1 orD2 line, in an absorption cell without wall coating and with a buffer gas. Extensive numerical computations have been performed in view of ascertaining the relative importance of the relevant parameters, and some conclusions are drawn about the possible uses of optical pumping in the study of the excited state collisional mixing and in the construction of polarized targets.

Treatment of metal hydrides

Abstract: Metal hydrides prepared under nitrogen or other highly adsorbed gas are treated to reduce evolution of such gas upon slurrying with inert liquids by (1) heating under reduced pressure to 100 DEG to 200 DEG C. for 1 to 24 hours, (2) contacting with helium, hydrogen or other slightly adsorbed gas and (3) cooling to ambient temperature in contact with the latter gas.

A critical evaluation of the use of ultrasonic absorption for determing high-temperature gas properties

Abstract: Evaluation of ultrasonic absorption technique for measuring high temperature gas properties