Abstract

Localized excitations with lattice relaxation play an important role for optical nonlinearities in one-dimensional conjugated polymers.¹,² Optical probing of electronic gap-states associated with the localized excitations is of quite interest because it provides us with a microscopic picture for the creation and relaxation mechanisms as well as the dynamic behavior of the localized excitations. Here we present visible to near-infrared transient spectra of three substituted polyacetylenes with a time-resolution ≤300fs. Photoinduced absorption (PA) band due to the localized excitations was disclosed deep in the gap for the first time.

© 1995 IEEE