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Al Mg Alloy for Reactive Gas Gettering in a Glow Discharge

IP.com Disclosure Number: IPCOM000085162D
Original Publication Date: 1976-Feb-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 61K

Publishing Venue

IBM

Related People

Chance, DA: AUTHOR [+3]

Abstract

It is known that the presence of H(2) and other reactive gases in glow-discharge cells, such as gas lasers and gas discharge display panels, tends to cause problems. It has been found that electrodes made of an alloy of Al and Mg act to remove H(2) and possibly other reactive gases from a noble gas glow discharge cell.

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Al Mg Alloy for Reactive Gas Gettering in a Glow Discharge

It is known that the presence of H(2) and other reactive gases in glow- discharge cells, such as gas lasers and gas discharge display panels, tends to cause problems. It has been found that electrodes made of an alloy of Al and Mg act to remove H(2) and possibly other reactive gases from a noble gas glow discharge cell.

One of the reasons for removing H(2) and other reactive gases from the typical He-Ne glow-discharge device is that such gases tend to lower the ionization potential of the gas. Moreover, in the case of the laser, the presence of H(2) may cause cataphoresis or reduce the density of the metastable lasing levels of Ne, thereby lowering the laser power output. Commercial lasers typically show varying levels of H(2) as measured by the glow-discharge spectra.

According to this description, it has been found that evaporated flat-film electrodes consisting of Al + approximately 1.5% Mg remove completely all detectable traces of H(2) from a He-Ne glow discharge. In one example, a cathode and anode consisting of 15 K Angstroms Al/700 Angstroms Mg/15 K Angstroms Al was deposited by evaporation onto a glass plate substrate as shown in Fig. 1. The glass plate substrate was then used to fabricate a test cathode cell as particularly illustrated. As shown, a second glass plate with a plasma bore running between two plasma or gas cavities in registry with the deposited electrodes, is positioned over the gl...