We employ density-functional theory to calculate realistic parameters for an extended Hubbard model of the molecular metal TTF-TCNQ. Considering both intra- and intermolecular screening in the crystal, we confirm the importance of the suspected longer-range Coulomb interactions along the...

The static dielectric constant ϵ of methyl fluoride and trifluoromethane was measured between -60 and 195°C and from 50 to 2000 bar. (c(CH3F)=44.6°C, Tc(CHF3)=26.3°C.) The high pressure cell and procedure is described. At 20°C the ϵ-values for CH3F increase between 50 and 2000 bar from 9.7...