Effects on 1H and 129Xe NMR spectra of large magnetization created by dissolved laser-polarized xenon

We describe the effects observed on H-1 and Xe-129 NMR spectra resulting from the presence of laser-polarized xenon at high concentration in a deuterated solvent. We show that the large xenon polarization modifies proton signal intensities due to heteronuclear dipolar cross-relaxation, while the huge xenon magnetization per unit volume induces sizeable average dipolar field which shifts the proton resonance frequency. Finally, the large xenon magnetization modifies the xenon spin dynamics inducing frequency shift, line broadening, the appearance of narrow resonances (spectral clustering) or spontaneous large transverse magnetization (maser emission) when polarized xenon is prepared by optical pumping in such a way that its highest Zeeman energy level is the most populated one.