Abstract
Derivation of the anisotropic plasma frequencies of the tetramethyltetraselenafulvalene salts (TMTSF)2X is given with taking account of the quasi-one-dimensional electronic band, the anisotropy of the core dielectric constant, and the non-orthogonality of the structural system. By applying the obtained expressions, Eqs. (16), to optical and structural data, the values of the transfer energies ta and tb for three (TMTSF)2X are obtained. By using these values the SDW transitions in the (TMTSF)2X are discussed in the light of the theoretical crite rions for the existence of SDW at low temperatures.
