We have developed a high-purity sol-gel coating for the interior surface of glass cells used for polarizing 3He by spin-exchange optical pumping. The coating is designed to minimize spin relaxation due to wall collisions. A longitudinal spin-relaxation time T1 in a sol-gel coated Pyrex cell of 344 ± 8 h was achieved, the longest T1 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.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)