Abstract: Using nonresonant two-photon (NRTP) method, we studie d the photoreactive properties of polysilane polymer. The results show that the two-photon reaction of polysilane polymer is very different from single photon reaction. We can get the oligosilasne with any chain-length of Si atoms from po lysilane by two-photon excitation.

Key words: polysilane, nonresonant two-photon excitation, photodegra dation, averaged molecular weights