Spin propagation

G. 1. Sivashinsky, On Spinning Propagation of Combustion Waves, SIAM J. Appl. Math. 40 (1981), 432. 

HOHAHA (Homonuclear Hartmann-Hahn Spectroscopy). This method is based on spin propagation (Braunschweiler and Ernst 1983 Summers et al. 

The simple form of the spin propagator might have inspired Haeberlen and Waugh [29] to make use of the Magnus expansion to gain insight into... 

To make the series expansion in Eq. (4) converge faster, it is usefiil to transform the description into an interaction frame, where the Hamiltonian is divided into a larger and a smaller part, e.g., H t) =Ho t) + Hi t) with Hi (t) being the larger term. With this approach, we can separate out the evolution due to the larger part of the Hamiltonian by writing the spin propagator as a product [29]... 

Comotti, A., R. Simonutti and P. Sozzani. 1996. Hydrated calcium silicate and poly(vinyl alcohol) Nuclear spin propagation across heterogeneous interfaces. Chem. Mater. 8, 2341-2348. 

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