Showing papers in "Vacuum in 1980"

TL;DR: In this article, a helium desorption spectrometer with small volume incorporated in a large multipurpose uhv target chamber is described, and the results have been obtained on substitutional Kr in W (100).

TL;DR: In this paper, a review and analysis of work on the investigation of formed metal-insulator-metal (MIM) systems based on oxynitride films of silicon is presented.

TL;DR: In this paper, the authors explain in detail how such cryopumps operate, in order that their strengths and limitations can properly be understood and potential users can make the correct choice of pump for each particular application.

TL;DR: In this paper, a quadrupole mass spectrometer was used to determine the outgassing characteristics of Hialvac glaze and Teflon by analysing the residual gases in an ultra-high vacuum (10−9 Pa range) system.

TL;DR: In this paper, the authors measured the photoelectron energy distribution from thin layers of semitransparent gold films under ultra-violet excitation and determined the film thickness needed for optimum high photoemission of 10−8 A cm−2.

TL;DR: In this article, a field emission cold cathode with a lifetime in excess of a thousand hours has been proposed for tungsten needle or refractory metal carbide types such as Ta, V and Nb.

TL;DR: In this article, the floating potential to ground VFG and the ground to plasma potential Vgp have been measured in a magnetron and ht (non-magnetic field) sputtering system.

TL;DR: In this article, the authors examined the film structure in a scanning electron microscope and showed that the temperature zones defined through the different morphology with increased discharge voltage were driven down to lower temperatures.

TL;DR: In this article, the reaction of oxygen, water vapour, carbon monoxide and carbon dioxide with films of barium evaporated on sputter-cleaned nickel was investigated by means of Auger electron spectroscopy.

TL;DR: In this article, the authors describe two microwave tubes which use a resonant coupled cavity output circuit (RCCO) with a 7% bandwidth in S-band and an 8% band-width in L-band.

TL;DR: In this article, the authors considered the important questions for many cases in the measurement of vacuum: what is the dependence in the isobaric container at any temperature of the container wall (T 1 ) of the comparatively small cryosurface temperature (T 2 ) and of the converter temperature(T c ), of the magnitudes of the pumping pressure p the ultimate pressure p e (T1 T 2 ), the pumping speed S and the particle stream density I together with the values p* i shown by the vacuum gauges?

TL;DR: In this article, the authors developed a theorem for the total probability of particle transmission, W 1n, and the total conductance, C equations (29) and (31), for a series connection of any number n of kinds of baffle of cross-section area A i and transmission probability W i.

TL;DR: In this article, the same pressure appears in three main directions, and therefore simulates infinite test domes more perfectly than ones as given in the tentative standard ISO/DIS 3556/1 and others.

TL;DR: In this paper, it is shown that the optical reflectance gives information about several physical parameters of the photocathode under growth, such as the thickness and composition information of the S-type photocathodes.

TL;DR: By the evaporation of a thin film of quartz with embedded gold particles, a highly efficient selective absorber was produced in this paper, where the absorptance for solar radiation was α = 88 ± 1% and the hemispherical emittance e = 0.014 ± 0.005; α/e = 63.

TL;DR: In this article, the electrical equivalent circuit for an rf excited plasma was presented, and the plasma parameters, viz. conductance and capacitance, were determined for rf planar magnetron systems.

TL;DR: A short summary of the history of turbomolecular pumps can be found in this article, where a comparison of the design data of 16 different TPU pumps (1958-1978) is given and the improvement during 20 years of TPU development demonstrated.

TL;DR: In this article, the advantages and disadvantages of diffusion and turbomolecular pump systems are discussed, making particular reference to cleanliness. But they do not consider the effect of turbomolescular pumps on the performance of diffusion.

TL;DR: In this article, an improved procedure is proposed based on the direct transmission probability between two coaxial disc surfaces in parallel planes, which can be achieved with an almost equal diameter, relatively large, but closely spaced disc configuration.

TL;DR: In this paper, the voltage stability of highly polished spherical electrodes degassed at 300°C was studied at voltages between 10 and 20 kV and electrode separations between 50 and 100 μm in an ultra-high vacuum of 10 −8 Pa.

TL;DR: In this article, the authors discuss both gas phase requirements for ion accelerators to minimize deleterious effects and outlines some of the processes which occur in atomic collisions due to the presence of adsorbed impurities.

TL;DR: In this article, a simple and relatively accurate method for measuring sticking probabilities and surface coverages in the interaction of gases with single crystal surfaces is described, where the measured sticking probability s is independent of gauge calibration factors, but in the present method the value measured is incidenceangle averaged.

TL;DR: The upper limits of the individual performance parameters of the third generation wafer tube are explored, and some of the trade-offs between the various parameters are explained.

TL;DR: In this paper, a typical design is shown in Figure 1, where the vertical jet operates in the same way as a diffusion pump, the operation of which is described later, and the horizontal jet is the ejector.