Capacitor

A capacitor comprising:

• a. a sealed hollow glass container;
• b. inductor means, a portion of which is mounted within said sealed glass container;
• c. an outermost layer of material is selected from one of a group of materials consisting of gold, titanium, niobium and selenium, having a purity of approximately 99% or more, deposited over the portion of the inductor means located within said glass container and the inner surface of said glass container, and an innermost layer of titanium, having a purity of approximately 99.7% or more, deposited over the exposed surface of said outermost layer;
• d. a gaseous mixture filling said sealed glass container, said gaseous mixture having a pressure, at 25.degree. C., of approximately 100 torr or more, the gases in said mixture being selected from a group of gases consisting of helium, neon, argon, krypton and xenon in which the amount of argon, neon and xenon does not, individually, exceed approximately 50%, by volume, of the total volume of said gaseous mixture, the amount of helium varies from approximately 10% to 90%, by volume, of the total volume of said gaseous mixture and the amount of kyrpton does not exceed approximately 20%, by volume, of the total volume of said gaseous mixture, the purity of said gases being approximately 99.9% or more;
• e. the inner surface of said glass container having adsorbed gases substantially removed therefrom prior to the deposition of the outermost layer by exposure to a vacuum pressure that reaches approximately 1.times.10.sup.-6 torr or lower and, during the latter part of said evacuation, at a temperature of approximately 80.degree. C. or more.