Abstract
The ratio of the diffusion coefficient to the mobility for electrons has been measured in liquid argon by using a modified Townsend apparatus. The measured ratio monotonically increases from ∼0.1 to ∼0.4 eV with an increase in the electric field from ∼2 to ∼10 kV/cm. The ratio is smaller than that in gaseous argon at the same value of , where is the atomic density. The mean momentum-transfer cross section is estimated as a function of on the assumption , where is the mean electron agitation energy. Thus the obtained is nearly constant (3∼4× ) for from 0.15 to 0.6 eV. This value of is almost the same as that estimated from the low-field mobility of electrons in liquid argon. This result is consistent with both Derenzo's experiment and Lekner's theory. It is concluded that there is no Ramsauer minimum at about 0.4 eV of , where the minimum exists in gaseous argon.
- Received 6 December 1978
DOI:https://doi.org/10.1103/PhysRevA.20.2547
©1979 American Physical Society