Streamlined method of oxidation in glow discharge deposited aluminum cold cathodes. For the process of oxidation of the samples were fixed on the cathode current-carrying elements in glass flasks, soldered to comb vacuum post.
The anode oxidized aluminum electrode was used a large area, allowing to minimize the absolute value of the anode fall and ensure the irrelevance of its changes in the course of experiments.
The thickness of the oxide layer formed on the surface of the aluminum sublayer test samples was measured using ellipsometric techniques. Thickness measurement error was at 10−15%.
To determine the ion-electron emission (γ) used the calculation method based on the dependence of the cathode fall of γ. Direct measurement of the cathode fall is to use a complex system of probe measurements. But the task set is quite successfully solved by indirect measurements. As measured parameter may introduce a voltage drop across the gap burning anode – cathode. In our case, such a possibility is due to the following statements.
The voltage drop across the discharge gap anode-cathode is the sum of the anode and the cathode potential drop, as well as the potential drop in the positive column of the discharge. The latter is determined by the conductivity of the positive column, depending on the pressure and composition of the gas filling and the discharge current, constant during the experiment, resulting in a constant value.
In all series of experiments are oxygen pressure was 250 Pa, the discharge current density at the cathode of 1,5 mA/cm2. Analysis of the results of studies confirmed the presence of a non-monotonic relationship between the oxidation conditions (discharge current density of oxygen, while its course) and emission properties of the oxide layer formed on the surface as a result of the deposited aluminum sublayer.
The parameters that provided in the oxide layer value γ = 0,18, which indicates a high perfection of the oxide layer on the aluminum sublayer, which allows to predict the high life of a helium-neon laser.
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