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Polarisation of a spin–NMR probe 11Be using collinear laser optical pumping

TitlePolarisation of a spin–NMR probe 11Be using collinear laser optical pumping
Publication TypeJournal Article
Year of Publication2009
AuthorsLevy, CDP, Pearson, MR, Morris, GD, Lassen, J, Chow, KH, Hossain, MD, Kiefl, RF, Labbé, R, MacFarlane, WA, Parolin, TJ, Root, L, Saadaoui, H, Smadella, M, Wang, D
JournalPhysica B: Condensed Matter
Pagination1010 - 1012
KeywordsMagnetic probe

Spin 1 2 probes have special importance in the field of NMR, since they have no electric quadrupole moment and are thus pure magnetic sensors. The absence of quadrupolar splittings greatly simplifies the \{NMR\} frequency spectrum. That the muon is spin 1 2 is one of the reasons it has become so useful as a magnetic probe. Until now there has been no spin 1 2 probe suitable for beta-detected NMR. Such a probe would be particularly useful in complex materials, which are in general non-cubic. In this paper we describe the development of a low energy beam of spin-polarised 11Be, which is the lightest spin 1 2 isotope suitable for β -NMR. The intensity of the 11 Be + beam—generated by a laser ionisation source—is about 10 6 / s . The 11Be nuclei are polarised by collinear laser optical pumping with an externally frequency doubled dye laser tuned to the 2 S 1 / 2 –2 P 1 / 2 transition of 11 Be + at 313 nm.