Measurements of3Hespin-exchange rates

Large Production System for Hyperpolarized 129Xe for Human Lung Imaging Studies

“…If the pumping cell is short, the use of a design as shown in Fig. 3a would bring no compromises other than small skew-angle effects [25]. However, meter-long pumping cells, such as ours, required development of a new optical setup in order to obtain a circular beam uniformly filling the column over its entire length.…”

Development of high-performance alkali-hybrid polarizedHe3targets for electron scattering

“…(27), however, that Γ A becomes arbitrarily large as D is increased, increasingly limiting the alkali polarization P A , and causing much of the roll off evident in Fig. 2.…”

“…Under our operating conditions, the populations of these sublevels are well modeled by a spintemperature distribution [46]. We made in situ measurements of the alkali polarization by monitoring the Faraday rotation angle while Zeeman transitions were induced [45]. Such transitions depolarize the alkali-metal vapor and consequently decrease the Faraday rotation angle.…”

“…II A that are used in our simulation. As a result, this simulation includes (1) the full solution to the coupled alkali-hybrid polarization equations, (2) the effect of off-resonant absorption by the Rb D2 & K Dn lines with realistic absorption lineshapes, (3) radiation trapping, which is included "by hand" by using the factors X a & X a , (4) skew optical pumping [27], and (5) effects associated with nonzero excited state populations. The role of each of these effects, which until recently [28,29] have not been included in most optical pumping simulations, can be understood by generalizing Eqn.…”

“…(40) for simplicity) P A , γ se (which is in turn is proportional to the density of alkali-metal atoms) and X. A useful diagnostic for studying these parameters in a target cell is the observation of Faraday rotation [44,45] using a linearly polarized probe laser.…”