DEEXCITATION OF HELIUM ATOMS IN THE METASTABLE TRIPLET STATE (2-3S) IN PURE HELIUM.
Foundational research phase rept.,
NAVAL AIR DEVELOPMENT CENTER JOHNSVILLE PA ANTI-SUBMARINE WARFARE LAB
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The processes whereby the functioning of metastable helium magnetometer may be deteriorated or destroyed by deexcitation of metastable triplet atoms are discussed, with particular attention to processes that take place even in very pure helium. Topics treated include relative effectiveness of destruction processes, species of colliding particles and types of collisions, and effects of cell dimensions and pressure on metastable destruction. Deexcitation by impurities, and processes involving the rarer helium isotope of mass three, will be considered in subsequent reports. A bibliography of the unclassified periodical literature arranged alphabetically by author is included, giving titles and abstracts of articles, to provide a concise but relatively complete survey of the field. Author