A theory is formulated that explains the observed bond-length change in graphite intercalation compounds in terms of the charge transfer $f$. The values of $f$ obtained via the bond-length changes are in good agreement with those derived with other methods. The present analysis also provides information on the electron-phonon coupling that defines the maximum conductivity.

• Received 11 March 1981

DOI:https://doi.org/10.1103/PhysRevLett.47.593