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A complete working design for highly stable grating controlled N 2 O and CO 2 lasers is presented. The lasers are suitable for general high resolution spectroscopy, frequency mixing and clock applications.
Using the pulsation properties of gas bubbles it is possible to measure acoustically volumes c.q. equivalent diameters of gas bubbles in the range of 1.8–2.1 mm, produced at low frequencies at capillary tubes in a silent environment. Hence it is possible to measure very low gas flow rates (from...
We describe a simple design modification which will solve the spurious surface charging effects associated with the use of sweep plates to investigate gaseous ions. The procedure involves using a fluid insulator to electrically isolate the electrometer electrode.
In order to achieve turbulence measurements in supersonic flows the frequency response of CTA is tested and improved. A fast and convenient technique to determine electrically the frequency response is proposed; the response is also tested by direct heating of the wire by means of a laser beam....
A technique for fabricating O‐ring type gaskets from electrical utility wire is described, including criteria for successful welds using facilities readily available in the average laboratory.
A pressure jump relaxation technique is described to study fast reactions in solution under pressure up to 1.5 kbar. The mechanical relaxation time of the instrument is 0.5 ms.
A reactor suitable for kinetic measurements on photolytically initiated elementary free‐radical reactions over approximately the 300–1900 K temperature range is described. Performance data are given for the O+CH 4 →OH+CH 3 reaction.
A high pressure, radio frequency discharge nozzle beam source has been developed for the production of very intense (⩾10 18 atoms sr −1 s −1 ) supersonic beams of oxygen atoms. An efficient impedance matching scheme has been devised for coupling the radio frequency power to oxygen–rare...
A circuit is described which permits a hysteretic ratio to be graphed versus another experimental parameter. The hysteretic ratio can be defined either: (a) by the two discontinuities of the I – V response (or more exactly the two discontinuities in ( d V / d t ) or (b) by the two polarity...
An impact facility has been designed and constructed to produce and measure large amplitude one‐dimensional compression and shear waves in solids. Design considerations and experimental details to produce the necessary impact configuration and to measure the particle velocity profiles resulting...
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