Anisotropic hyperfine interactions limit the efficiency of spin-exchange optical pumping of ³He nuclei.
Phys Rev Lett
; 107(2): 023204, 2011 Jul 08.
Article
em En
| MEDLINE
| ID: mdl-21797604
ABSTRACT
We use accurate ab initio and quantum scattering calculations to demonstrate that the maximum ³He spin polarization that can be achieved in spin-exchange collisions with potassium (³9K) and silver (¹°7Ag) atoms is limited by the anisotropic hyperfine interaction. We find that spin exchange in Ag-He collisions occurs much faster than in K-He collisions over a wide range of temperatures (10-600 K). Our analysis indicates that measurements of trap loss rates of ²S atoms in the presence of cold ³He gas may be used to probe anisotropic spin-dependent interactions in atom-He collisions.
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En
Ano de publicação:
2011
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Article