2-PHOTON-RESONANCE 4-WAVE-MIXING FOR THE STUDY OF PERMANENT MOLECULARDIPOLES

Two-photon-resonance four-wave mixing (TPR-FWM) spectroscopy was exami ned for the study of the permanent electric dipole moments of molecula r states. A TPR-FWM process of the type omega(4) = omega(1) -omega(2) + omega(3) in a three-state dipolar system was considered. The extract ion of data for the difference in permanent dipole moments (Ap) of sta tes involved in TPR was analysed in the case of resonance TPR-FWM, Res onance TPR-FWM measurements were performed in a solution of the polydi acetylene poly-4BCMU. (C) 1998 John Wiley & Sons, Ltd.