The creation of HP 3He via SEOP is traditionally done using rubidium as the alkali metal intermediary. One drawback to this method is the time required to polarize the 3He, typically requiring 10--20 hours to achieve 40--50% polarization in enough gas (aap;1 L) for a single experiment. Two advances in SEOP have led to dramatic enhancements in efficiency: the use of spectrally narrowed diode laser arrays and hybrid SEOP, which employs both potassium and rubidium. We have combined these techniques to construct a dedicated 3He polarizing system capable of producing g60% 3He polarization in 0.5 barAmL of gas in valved and refillable glass cells in under 4 hours.... of K and Rb distilled into our cells, but it is expected that with more experience it will become possible to more fully control Tagt; in future cells. ... Two methods of increasing the rate of production of HP 3He are discussed in reference .
|Title||:||Polarization and Relaxation in Hyperpolarized Helium-3 and Xenon-129|
|Author||:||Benjamin Charles Anger|
|Publisher||:||ProQuest - 2008|