Abstract
It is analytically demonstrated that dimerization of the donor column in (TMTSF) 2X salts, as judged by the difference in the separation of molecular centers of mass, increases as the size of the counter ion X increases. Interestingly, one of the two independent center-of-mass separations appears to be constant across the series of salts, while the second is variable. This differing behavior is traceable to the different manner in which alternate donor pairs interact with the anion substructure. The general increase in the dimerization of the donor column parallels the increasing critical pressure necessary to achieve the superconducting ground state.
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