We present a design for a spin-exchange optical pumping system to produce large quantities of highly polarized 129Xe and 131Xe. Low xenon concentrations in the flowing gas mixture which allow the laser to maintain high Cs polarization. The large spin-exchange rate between Cs and Xe through the long-lived van der Waals molecules at low pressure, combined with a high flow rate, results in large production rates of hyperpolarized xenon. The fast rates make it possible to obtain large nuclear polarizations after several minutes of optical pumping with a laser.At high Xe pressures. According to the theory, the longitudinal spin-elaxation rate 1T1 of Xe in a high-pressure sample containing only Xe and Cs vapor has the simple form is the velocity averaged binary spin-exchange cross section, It is the relaxation rate due to wall collisions and perhaps magnetic field inhomogeneities. Our results complement earlier studies performed at 129Xe pressures of about 20 Torr and 131Xe pressures of about 20 Torr and N2 pressures of 600 Torr . This work is useful for predicting spin-exchange rates between polarized Cs atoms and Xe nuclei.
[1]
I. Ruset,et al.
Optical pumping system design for large production of hyperpolarized.
,
2006,
Physical review letters.
[2]
S. R. Parnell,et al.
Enhancement of 129 Xe polarisation by off-resonant optical pumping
,
2010
.
[3]
M. Mehring,et al.
Nuclear quadrupole interaction of highly polarized gas phase 131Xe with a glass surface
,
1994
.
[4]
Thomas G. Walker,et al.
129Xe-Xe molecular spin relaxation.
,
2002,
Physical review letters.
[5]
Cates,et al.
Relaxation of spins due to field inhomogeneities in gaseous samples at low magnetic fields and low pressures.
,
1988,
Physical review. A, General physics.
[6]
M. Barlow,et al.
{sup 129}Xe-Cs (D{sub 1},D{sub 2}) versus {sup 129}Xe-Rb (D{sub 1}) spin-exchange optical pumping at high xenon densities using high-power laser diode arrays
,
2011
.
[7]
Michael V. Romalis,et al.
Theory of spin-exchange optical pumping of 3 He and 129 Xe
,
1998
.