Gradient-based pulse sequences for benchtop NMR spectroscopy

Gradient-Echo Pulse Sequences

The basic idea of parallel imaging is to reduce the number of acquisition steps (i.e. phase-encoding steps) by decreasing the sampling density in kspace. Artefacts, in particular aliasing artefacts, that would result from the reduced sampling density are compensated by employing image data from several independent coil elements with different spatial sensitivity profi les for reconstruction. Th...

Optimal control of coupled spin dynamics: design of NMR pulse sequences by gradient ascent algorithms.

In this paper, we introduce optimal control algorithm for the design of pulse sequences in NMR spectroscopy. This methodology is used for designing pulse sequences that maximize the coherence transfer between coupled spins in a given specified time, minimize the relaxation effects in a given coherence transfer step or minimize the time required to produce a given unitary propagator, as desired....

The Vector Paradigm in Modern NMR Spectroscopy: I. Pulse Sequences Applied to Isolated Spin Systems

Gradient-Diffusion Methods for Simulating Decoherence by NMR Spectroscopy

Theoretical techniques are developed for designing nuclear magnetic resonance (NMR) experiments to simulate a variety of adiabatic decoherence (aka T2 relaxation) processes, using sequences of pulsed field gradients and diffusion periods. To this end an efficient Hadamard product formalism is introduced and used to derive Lindblad master equations from NMR pulse sequences for both collective an...

Choosing the best pulse sequences, acquisition parameters, postacquisition processing strategies, and probes for natural product structure elucidation by NMR spectroscopy.

The relative merits of different pairs of two-dimensional NMR pulse sequences (COSY-90 vs COSY-45, NOESY vs T-ROESY, HSQC vs HMQC, HMBC vs CIGAR, etc.) are compared and recommendations are made for the preferred choice of sequences for natural product structure elucidation. Similar comparisons are made between different selective 1D sequences and the corresponding 2D sequences. Many users of 2D...