We introduce the PRESERVE pulse sequence element, allowing variable flip-angle adjustment in 2D ¹H-¹⁵N and ¹H-¹³C TROSY-type correlation experiments. PRESERVE-TROSY exploits a remarkable array of up to nine orthogonal polarization-coherence transfer pathways, showcasing the remarkable potential of spin manipulations achievable through the design and optimization of NMR pulse sequences.

We have written a programming library for biological NMR, a commonly used research method. Its use simplifies (makes faster and less error-prone) development of new research methods. We demonstrate that it allows for consolidation of several experimental methods into one file without adding complexity. We hope that it will be of use for other groups developing NMR experiments.

In nuclear magnetic resonance, the magnetization of abundantly present nuclei contributes to the overall field felt by the same nuclei through intermolecular dipolar interactions. This has led to many surprising discoveries, such as multiple-spin echoes and intermolecular cross-peaks in 2D spectroscopy. In this work, the effect of the dipolar field under continuous irradiation is investigated. Various methods to obtain intermolecular transfer of phase coherences are presented.

In contrast to adiabatic excitation, recently introduced SORDOR-90 pulses provide effective transverse 90° rotations throughout their bandwidth, with a quadratic offset dependence of the phase in the x,y plane. Together with phase-matched SORDOR-180 pulses, this enables a direct implementation of the Böhlen–Bodenhausen approach for frequency-swept pulses for a type of 90°/180° pulse–delay sequence. Example pulse shapes are characterised, and an application is given with a 19F-PROJECT experiment.

Long-lived nuclear spin order helps extend the timescale of polarisation storage. This occurs as populations of nuclear spin singlet states feature slow decays compared to longitudinal magnetisation. The excitation of these symmetry-adapted states required spin choreographies that were often overshadowed in scholarly presentations by their applications. We recapitulate some of the milestones achieved in designing methods for long-lived spin order excitation and comment on future perspectives.