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.

Multidimensional NMR relaxation experiments provide a powerful means of studying protein dynamics but typically require long acquisition times. Here, we combine two approaches that individually shorten the length of the experiment: accordion spectroscopy and non-uniform sampling (NUS). We extract relaxation rate constants by applying maximum likelihood estimation of sparse exponential modes modeled on the accordion–NUS interferograms, resulting in time savings by a factor of roughly 10.

NMR represents a key spectroscopic technique for studying intrinsically disordered proteins (IDPs) that lack a stable three-dimensional structure. We present a set of NMR experiments tailored for proline residues, which are highly abundant in IDPs. The novel experiments have very interesting properties for the investigation of IDPs of increasing complexity.

Isotope filters are pivotal for studying interactions between labelled and unlabeled moieties by NMR. We present an isotope filter method to complement existing filters and attenuate undesired signals that escaped them. This advance will readily facilitate molecular studies of binding events or post-translational modifications by NMR.