Rapid Raman spectroscopic determination of the stoichiometry of microscopic quantities of BEDT–TTF-based organic conductors and superconductors

An approximately linear dependence exists between the degree of charge transfer and the Raman-active CC stretching frequencies in insulating, conducting, and superconducting salts of the electron-donor molecule BEDT–TTF, which may be used to rapidly deduce the stoichiometry of newly synthesized materials.