Sol-gel coated glass cells for spin-exchange polarized [sup 3]He

Hsu, Ming F.; Cates, G. D.; Cates, G.D.; Kominis, I.; Aksay, I. A.; Aksay, I.A.; Dabbs, D. M.; Dabbs, D.M.
September 2000
Applied Physics Letters;9/25/2000, Vol. 77 Issue 13
Academic Journal
We have developed a high-purity sol-gel coating for the interior surface of glass cells used for polarizing [sup 3]He by spin-exchange optical pumping. The coating is designed to minimize spin relaxation due to wall collisions. A longitudinal spin-relaxation time T[sub 1] in a sol-gel coated Pyrex cell of 344±8 h was achieved, the longest T[sub 1] we have ever recorded for a gaseous sample. Repeated trials indicated that the coating was quite robust. Results using an uncoated Pyrex cell were also quite good, although inferior to the performance of the coated cell. © 2000 American Institute of Physics.


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