Abstract

Femtosecond time-resolved absorption spectroscopy^[1-3] was performed on a substituted polyacetylene, poly[o-(trimethylsilyl) phenylacetylene] (PMSPA), thin film using a pump-probe method. To elucidate the ultrafast relaxation dynamics, the stress is placed on the importance of confinement of photogenerated charge carriers, and also the discussions will be made on the possibility for an elementary excitation to take the form of a confined soliton-antisoliton pair. Due to the similarity of the back-bone structure between PMSPS (Fig. 1) and trans-polyacetylene, the results obtained here will give hints to make the relaxation mechanism in polyacetylene clear.

© 1992 IQEC