| Summary: | <p>Long-lived spin order-based approaches for magnetic resonance rely on the transition between two magnetic environments of different symmetries, one
governed by the magnetic field of the spectrometer and the other where this
strong magnetic field is inconsequential. Research on the excitation of
magnetic-symmetry transitions in nuclear spins is a scientific field that
debuted in Southampton in the year 2000. We advanced in this field carrying the baggage of pre-established directions in NMR spectroscopy. We propose to
reveal herein the part of discoveries that may have been obscured by our
choice to only look at them through the experience of such pre-established
directions at the time. The methodological developments that are emphasised herein are the mechanisms of translation between the symmetric and
non-symmetric environments with respect to the main magnetic field
<span class="inline-formula"><i>B</i><sub>0</sub></span>. More specifically, we look again thoroughly at zero-quantum
rotations in the starting blocks of long-lived state populations,
magnetisation transfers between hyperpolarised heteronuclei, and protons. These pulse sequences seed subsequent magnetic mechanisms that contribute to further applications. For instance, we show how some of the introduced
coherence rotations were combined with classical pulse blocks to obtain two-dimensional correlations between protons and heteronuclei. We hope the pulse sequence
building blocks discussed herein will open further perspectives for magnetic resonance experiments with long-lived spin order.</p>
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