Abstract
Over 50% proton polarization has been attained in three sulfate alum crystals containing dilute ${\mathrm{Cr}}^{3+}$ ions, at 1 K and \ensuremath{\sim}19.5 kG, with limited microwave power (\ensuremath{\sim}\textonequarter{} W). The EPR spectra are dominated by the (-\textonehalf{}, \textonehalf{}) transition, with linewidths varying from 10 to 22 G. Al(N${\mathrm{H}}_{4}$) alum should make useful polarized proton targets because it contains 1.97 times as much hydrogen by weight as lanthanum magnesium nitrate.
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