th  - 1987 - 51st ENC Conference

WF78
A NOVEL METHOD FOR DIFFUSION AND FLOW MEASUREMENTS:
IMAGING OF TRANSIENT MAGNETIZATION GRATINGS
Timothy R. Saarinen* and Charles S. Johnson, Jr.
Department of Chemistry 045A
University of North Carolina
Chapel Hill, NC 27514
Holographic relaxation spectroscopy (HRS) is an optical
method in which a grating pattern of photoproducts is written
into a sample by a laser interference pattern. The time
evolution of the grating is determined by diffusion, flow,
and relaxation rates. Analogous PFG-NMR experiments are
described in which sinusoidal patterns of magnetization are
"written" into samples along the gradient direction. The
time evolution of the "grating" with diffusion, flow, and
relaxation present is determined. To monitor the time
dependence, a "reading" gradient is applied during acqui-
sition to yield an image of the "grating" after Fourier
transformation with respect to the acquisition time. The
Carr-Purcell sequence with an applied magnetic gradient is
discussed along with applications to diffusion and flow.