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Xenon mean free path

Demarquay and Fraissard have shown that the intercept, o0, can be interpreted in terms of a "mean free path" of xenon in the zeolite and have related this NMR-derived mean free path to structural parameters such as channel diameter by a Monte Carlo simulation procedure. They empirically determined the intercept to depend on mean free path as... [Pg.318]

The characterization of zeoUte pore architecture by Xe NMR spectroscopy requires a discussion of the chemical shift of xenon atoms in dependence of the pore size. Demarquay and Fraissard [291 ] have shown that the chemical shift, is inversely proportional to the mean free path, Z, of a single xenon atom in the zeoUte pores. For an infinite cyUnder, the mean free path is given by Z=Dc-Djs where is the diameter of the cylinder and the diameter of the xenon atom... [Pg.272]

Determine (a) the mean free paths, (b) the average collision frequencies, and (c) the total number of collisions between argon and xenon atoms in a 50 50 mixture. Assume... [Pg.694]

As mentioned above the Xe NMR chemical shift can be used to calculate the average diameter of the pores in a material using the equations developed by Demarquay and Fraissard 46). Equation (5) describes the relationship between the Xe chemical shift (5waii) and the mean free path length (/) of the xenon atoms within the confined space of the pores ... [Pg.403]

See other pages where Xenon mean free path is mentioned: [Pg.308]    [Pg.308]    [Pg.275]    [Pg.320]    [Pg.266]    [Pg.269]    [Pg.40]    [Pg.88]    [Pg.173]    [Pg.490]    [Pg.40]    [Pg.272]    [Pg.503]    [Pg.341]    [Pg.172]    [Pg.461]   


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