Cross-polarization experiment magnetization calculation

As in the NMR experiments the samples were magnetically oriented with the field direction perpendicular to the NMR tube axis. Crossed polarizers were mounted on the magnet for correlation of optical and viscometric data. After a rotation experiment was performed the sample was removed from the magnetic field and placed in a 25.0 0.02°C constant temperature bath. The velocity of the sphere falling along the axis of the NMR tube measured using a cathetometer and timer was used to calculate the Stokes law apparent viscosity. A Faxen correction (ll) of about 5 was applied to all data. 

Unfortunately, in the VUV region no polarimetry data are available, but calculations indicate the degree of circular polarization achieved by the wiggler may be 80%, estimated to be no worse than 70% delivered at the experimental chamber [95, 96]. In PECD experiments, we have calibrated the polarization state by deduction from cross-comparison of results at a few fixed energies previously studied on the SU5 beamline where accurate polarimetry data was available [36]. Because the horizontal magnetic field array in the insertion device is electromagnetic, fast current reversal to switch left- and right-handed elliptical polarizations is possible, with the usual potential benefit for dichroism measurements. 

---