Excess electron mobility in ethane. Density, temperature, and electric field effects

Journal Article · Thu May 15 00:00:00 EDT 1980 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100447a023· OSTI ID:5288152

Doeldissen, W ^[1]; Schmidt, W F; Bakale, G

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1. Hahn-Meitner-Institut fuer Kernforschung Berlin GmbH, Germany

The excess electron mobility in liquid ethane was measured under orthobaric conditions as a function of temperature and electric field strength up to the critical temperature at 305.33 K. The low field mobility was found to rise strongly with temperature and exhibits a maximum value of 44 cm/sup 2/ V/sup -1/ s/sup -1/ at 2/sup 0/ below the critical temperature. At temperatures above 260 K the electron drift velocity shows a sublinear field dependence at high values of the electric field strength. These observations lead to the supposition that in liquid ethane a transition from transport via localized states to transport in extended states occurs. Measurements were also performed in fluid ethane at densities from 2.4 to 12.45 mol L/sup -1/ and temperatures from 290 to 340 K. On isochores in the vicinity of the critical density, an increase of the low field mobility with temperature was observed. This effect was found to disappear both at low (rho = 2.4 mol L/sup -1/) and high densities (rho greater than or equal to 9.2 mol L/sup -1/). In this density range, a sublinear field dependence of the drift velocities at high field strengths was noted. The critical velocity associated with the appearance of hot electrons was observed to decrease with higher densities indicating a smaller fractional energy transfer in electron molecule collisions. A compilation of electron mobilities in gaseous and liquid ethane shows that, up to densitiesof rho = 9.5 mol L/sup -1/, ..mu.. proportional to n/sup -1/ is fulfilled if temperature effects are ignored. At intermediate densities, 9 mol L/sup -1/ < rho < 16 mol L/sup -1/, a density dependence of ..mu.. proportional to rho/sup -5/ is found followed by a stronger mobility decrease toward the triple point. Positive ion mobilities measured under orthobaric conditions followed Walden's rule.

• DOE Contract Number: EP-78-S-02-4746
• OSTI ID: 5288152
• Journal Information: J. Phys. Chem.; (United States), Vol. 84:10
• Country of Publication: United States
• Language: English

Related Subjects

10 SYNTHETIC FUELS
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ETHANE
ELECTRON MOBILITY
DENSITY
ELECTRIC FIELDS
EXPERIMENTAL DATA
ISOLATED VALUES
TEMPERATURE EFFECTS
ALKANES
DATA
DATA FORMS
HYDROCARBONS
INFORMATION
MOBILITY
NUMERICAL DATA
ORGANIC COMPOUNDS
PARTICLE MOBILITY
PHYSICAL PROPERTIES
090110* - Hydrocarbon Fuels- Properties- (1979-1989)
400301 - Organic Chemistry- Chemical &amp; Physicochemical Properties- (-1987)