Accordion‐optimized DEPT experiments

Abstract

In this contribution, a pulse sequence is described for recording accordion-optimized DEPT experiments. The proposed ACCORDEPT experiment detects a wide range of one-bond coupling constants using accordion optimization. As a proof of concept, this strategy has been applied to a mesogen containing a large range of one-bond 1 J CH coupling constants associated with the various structural elements. The ACCORDEPT experiment afforded significant enhancements for the resonances with the larger 1 J CH couplings, similar SNR for aliphatic resonances, but reduced SNR for aliphatic resonances as compared with the standard DEPT experiment. In addition, the ACCORDEPT is straightforward to implement, does not require any supplementary calibration procedures and can be used under automated conditions without difficulty by inexperienced users.Supporting information may be found in the online version of this article.

Dynamic and thermodynamic properties of the generalized diamond chain model for azurite

“…The diamond chain contains dimers which are coupled strongly by J 2 . The structure factor of a dimer is known to depend strongly on the momentum transfer and to lead to vanishing intensity at zero momentum transfer along the dimer direction [80]. It is therefore important to use the precise positions R x of the spin-1/2 copper atoms in azurite [81] as well as the experimental value of the momentum transfer transverse to the chains [67] when evaluating (11) from G x,y .…”

Ferromagnetic and antiferromagnetic dimer splittings in LaMn0.1Ga0.9OFürrer1, Pomjakushina2, Pomjakushin3 et al. 2011Phys. Rev. B42130View full textAdd to dashboardCite

“…For spin dimers the neutron cross-section for a transition from the initial state |S> to the final state |S'> is defined by [14] €…”

A comprehensive discussion of HMBC pulse sequences. III. Solving the problem of missing and weakly observed long‐range correlations

“…This optimization produces a more uniform sampling of all couplings present by a decrementation step that is even in Hertz, as can be readily appreciated in Fig. , and as shown for accordion‐optimized DEPT experiments . In the curve shown on the top, the effect of equal time between decrementation steps, but not equal in Hertz, produces an asymmetry leading to non‐linear sampling of the desired coupling range.…”