Calcul des densités spectrales résultant d'un mouvement aléatoire de translation en relaxation par interaction dipolaire magnétique dans les liquides

Abstract

Calcul des densités spectrales résultant d'un mouvement aléatoire de translation en relaxation par interaction dipolaire magnétique dans les liquides.

Susceptibility‐induced T2‐shortening and unrestricted diffusion

“…[1], but with a different constant (2/5 instead of 4/9). When comparing their own result to the outer sphere rate, the authors mention a discrepancy of a factor of 10/27, but their reference is not the 4/9 constant as in Eq.…”

“…When comparing their own result to the outer sphere rate, the authors mention a discrepancy of a factor of 10/27, but their reference is not the 4/9 constant as in Eq. [1], but a 4/27 constant, i.e., the value given in Ref. 4.…”

“…[1]. Imposing refocusing pulses is physically equivalent to interrupting relaxation, so that relaxation remains governed by the short time behavior of the spin correlation function.…”

“…A recent theory has considerably improved our theoretical knowledge by accounting for echo refocusing (2). However, this new theory does not yield an exact agreement with the "classical" results obtained without echo pulses (1) when increasing the echo time up to an infinite limit, especially if one considers the numerical constants appearing in the equations. This question was briefly addressed in two footnotes in Ref.…”

“…T 2 -shortening caused by proton diffusion within field inhomogeneities created by magnetized spheres has long been known to be governed by the outer sphere theory, provided the motional averaging condition is satisfied (1). A recent theory has considerably improved our theoretical knowledge by accounting for echo refocusing (2).…”