We report the optical properties of molecular conductor (IEDT)[Pd(dmit)(2)]
. We observed a striking peak in the spectral range around 11000 cm(-1) for
the Light polarized along the dimeric direction. This peak suggests the st
rong dimerization of Pd(dmit)(2) molecules, leading the inversion between H
OMO and LUMO energy levels of Pd(dmit)(2). This peak intensity enables to e
stimate the charge transfer rho similar to 0.35 from IEDT to Pd(dmit)(2).