Transverse source images

Figure 13. Modified Velocity Map Imaging spectrometer showing the double einzel lens, L, Li, and 5-eV kinetic energy initially transverse trajectories from an extended source volume with Vjgp = 3000 V, Vext = 0.695 x Vjep, and Vl = Vli = 1000 V. Taken with permission from Ref. [102]. Copyright (c) 2005, American Institute of Physics.

Figure 12.14 A 002 lattice fringe image of a transverse section of Courtaulds HMS. Source Reprinted with permission from Guigon M, Oberlin A, Desarmot G, Microtexture and structure of some high modulus PAN based carbon fibres, Fibre Sci and Technol, 20, 177-198, 1984. Copyright 1984,...

The picture set up above is complete when the gradients are the sole source of spin evolution, there is no relaxation and the spins do not move. In the liquid state the gradients can often be made sufficiently strong that relaxation and chemical shifts are minor complications and the limits to resolution and image distortions arise from limited NMR sensitivity and molecular transport. For rigid solids, molecular transport is not an issue, but the short lifetime of the transverse spin magnetization is. 

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