No abstract

A Langmuir probe technique has been used to measure electron energy distribution functions in the positive column of a D C glow discharge in oxygen. The electron energy distribution function is shown to fit a functional form given by f(E) = CE1I2 exp (-BEn) where n = 1.6 + 0 . 1 ; the average electron energies lie between 4.4 and 5.0 eV.Une sonde de Langmuir a Cte utiliste pour mesurer les fonctions de distribution d'Cnergie des Clectrons dans la colonne positive d'une decharge luminescente a courant continu dans I'oxygene. On montre que la fonction de distribution d'energie des Clectrons est decrite par la forrne analytique f(E) = CE112 exp (-BE3 oh n = 1.6 + 0.1 ; les energies moyennes des Clectrons se situent entre 4.4 et 5.0 eV. [Traduit par le journal]Can.

A high intensity molecular beam apparatus is described which is based on a supersonic stream gas source. Intensities of the order of 10 17 molecules/cm 2 /sec have been achieved with nitrogen. The effects on performance of Mach number, source pressure, and geometry are summarized. Results are compared with theory.

No abstract

Measurements have been made of the concentration of dimers produced during the expansion from a supersonic nozzle. The gases studied were: Ar, N2,O2, CO, CO2, C2H4, and N2O. It is shown that an effective specific heat ratio of the expanding gas offers a means of correlating the dimer concentration in terms of the source gas pressure and temperature. The two nozzles employed had opening diameters of 0.14 mm and 0.065 mm. An attempt to obtain a universal dependence for all gases in terms of reduced source parameters was partially successful. Source temperature was varied between 90 °K and 295 °K.