摘要 :
A method for efficient and selective detection of 2 1S and 2 3S metastable He atoms is presented. Elastic
collisions with Ar atoms in a diffuse gas spatially separate these 2S atoms from the copropagating UV photons
that are inher...
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A method for efficient and selective detection of 2 1S and 2 3S metastable He atoms is presented. Elastic
collisions with Ar atoms in a diffuse gas spatially separate these 2S atoms from the copropagating UV photons
that are inherently present in metastable beams. The deflected 2S atoms are detected on a large-solid-angle
Faraday cup. A He discharge lamp can selectively quench 2 1S atoms, and optical pumping together with a
Stern-Gerlach magnet can selectively remove 2 3S atoms. As a result, we are able to efficiently detect either 2 1S
or 2 3S atoms (or both) without a UV background.
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