A new type of discharge in pure metal vapors like copper or titanium is described. A stable discharge is produced between a heated cathode and the anode which has a melted spot on its surface du% to the electron bombardment. The spectral characteristics prove that the discharge take place in the vapors of the anode material continuously evaporated from the melted spot on the anode. The discharge has a similar behaviour as the low voltage arc.
A full explanation of the M-effect, namely the reduction of the neon emission spectra practically to only one line of wavelength ½ ¿ nm, when the filling gas is a mixture Ne + Ar + H¾ or Ne + Xe + H¾ is presented.The M-effect is explained by ion-ion recombination according to the reaction Ne · · H Ne £´¾ Ô½µ·H, which feeds selectively the level ¾Ô½ of neon. All observed behavior of the M-effect is explained by polar recombination. Extension of the M-effect to other gas mixtures containing at least one electronegative component is also underlined.
The experimental results concerning the influence o the H2 and Ar addition to the Ne+1% Xe Penning mixture on the neon optical emission are obtained or two types o discharges: a narrow gap dielectric barrier discharge and the negative glow o a d.c. luminescent discharge. The H2 and Ar contribution to the depletion o the lower level 1s2 through the Penning collisions and also the hydrogen participation to the feeding of the upper level 2p1 of the optical transition 2p1 ‐ 1s2 of the neon have been demonstrated. As a possible explanation or feeding of the upper level 2p1 we are favouring the reactive and/or dissociative recombination processes.
The enhancement of the neon radiation of the transition 3p1(1/2)0-3s1(1/2)10 corresponding to the wavelength 585.25 nm is observed as hydrogen is added to the Penning mixtures Ne+1%Ar and Ne+1%Xe in a 5 kHz radiofrequency discharge. The enhancement is much higher in the case of a Ne-H2 mixture. The results suggest the possibility of increasing the output of the neon-hydrogen pulsed laser at 585.25 nm.
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