Electron mobility in supercritical propane as a function of density and temperature

The mobility of excess electrons in supercritical n‐ and isobutane was measured as a function of density at several temperatures. The density‐normalized mobility μN in both isomers goes through a minimum at a density below the respective critical density and the mobility is quite temperature dependent in this region, then goes through a maximum above the critical density where it is rather insensitive to temperature. The minimum in isobutane is not reproduced by the Cohen–Lekner equation with the structure factor S(K) estimated from the velocity of sound, while it is well accounted for by the model in n‐butane. This and other characteristics in the mobility behavior for n‐butane are typically those of nonspherical hydrocarbons such as ethane and propane, but are intermediate between spherical and nonspherical hydrocarbons for isobutane.

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