Conduction state energy of excess electrons in condensed media. Liquid methane, ethane, and argon, and glassy matrices

Journal Article · Wed Jan 01 00:00:00 EST 1975 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100593a013· OSTI ID:7104387

Noda, S ^[1]; Kevan, L; Fueki, K

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1. Wayne State Univ., Detroit

The temperature dependence of the conduction electron energy V/sub 0/ in liquid methane and ethane has been measured, and the theoretical model of Springett, Jortner, and Cohen (SJC) for the temperature dependence of V/sub 0/ is shown to apply to liquid alkanes as well as rare gases. Criteria for electron localization in liquid rare gases, molecular gases, and alkanes are critically discussed. The SJC criterion for electron localization in liquid rare gases is shown not be extendable to liquid alkanes or to molecular gases. In alkanes it is assumed that transient localization arises from rotational and translational fluctuations leading to cavities of molecular size. Then consideration of the kinetic and electronic polarization energies with a cavity radius given by Wigner-Seitz radius leads to a new localization criterion that seems generally applicable to alkane systems. Electrons in molecular gases probably move as molecular anions so neither of the above criteria apply to them. An empirical relation between the electron mobility and V/sub 0/ is found that seems valid for all alkanes at room temperature for both localized and quasi-free electron states. Values of V/sub 0/ for polar and nonpolar glassy matrices at 77/sup 0/K are derived from experimental data by two independent methods. It is found that V/sub 0/ becomes more positive as the glassy matrix polarity decreases.

• OSTI ID: 7104387
• Journal Information: J. Phys. Chem.; (United States), Vol. 79:26
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ARGON
ELECTRON MOBILITY
ETHANE
METHANE
CORRELATIONS
ELECTRONIC STRUCTURE
ELECTRONS
ENERGY LEVELS
LIQUIDS
LOW TEMPERATURE
TEMPERATURE DEPENDENCE
WORK FUNCTIONS
ALKANES
CRYOGENIC FLUIDS
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
FLUIDS
HYDROCARBONS
LEPTONS
MOBILITY
NONMETALS
ORGANIC COMPOUNDS
PARTICLE MOBILITY
RARE GASES
400301* - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)
400201 - Chemical & Physicochemical Properties