PATENT - NASA BARIUM ION CLOUD
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US3813875: ROCKET HAVING BARIUM RELEASE SYSTEM TO CREATE ION CLOUDS IN THE UPPER ATMOSPHERE
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Abstract: A chemical system for releasing a good yield of free barium (Ba°) atoms and barium ions (BA+) to create ion clouds in the upper atmosphere and interplanetary space for the study of the geophysical properties of the medium.
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Inventor(s): Paine; Thomas O. Administrator of the National Aeronautics and Space Administration with respect to an invention of , Hampton, VA 23364

Issued/Filed Dates: June 4, 1974 / April 28, 1972
Application Number: US1972000248761

CLAIMS:
What is claimed as new and desired to be secured by Letters Patent of the United States is:
1. Apparatus for releasing free barium atoms and barium ions in the upper atmosphere to emit resonance radiation in the form of a luminous cloud comprising:
a rocket vehicle capable of being launched into the upper atmosphere of earth, a longitudinally configured payload carried by said rocket vehicle, said payload including:
a fuel tank disposed at one end of the payload, an oxidizer tank disposed at the opposite end of the payload, and
an open ended combustion chamber diametrically disposed intermediate said fuel tank and said oxidizer tank and with both ends thereof being open to the atmosphere, conduit means connecting said fuel tank and said oxidizer tank to said combustion chamber, valve means disposed in said conduit means for selectively permitting fluid flow from said fuel tank and said oxidizer tank into said combustion chamber, a liquid fuel having a quantity of barium salts dissolved therein disposed within said fuel tank, a liquid oxidizer disposed in said oxidizer tank, said liquid fuel and said liquid oxidizer having the inherent chemical property characteristics of undergoing a hypergolic reaction upon contact with each other whereby, when said valve means permit flow of said liquid fuel and said liquid oxidizer into said combusion chamber the resulting hypergolic reaction releases a high yield of luminous barium atoms and barium ions.
2. The apparatus of claim 1 wherein the liquid fuel is selected from the group consisting of hydrazine and liquid ammonia.
3. The apparatus of claim 2 wherein the barium salts contained in the liquid fuel is a mixture of barium chloride and barium nitrate.
4. The apparatus of claim 1 wherein the liquid oxidizer is selected from the group consisting of F2, OF2 and ClF3.