Photoexcitations intrans-(CH)x: A Fourier-Transform Infrared Study

Abstract

Photoinduced absorption spectra of trans-${\left(\mathrm{CH}\right)}_x$ and -${\left(\mathrm{CD}\right)}_x$ between 15 and 8000 ${\mathrm{cm}}^{-1\mathrm{}}$ are presented. The data demonstrate that the photoexcitations result in charged solitons which are pinned. The isotope shifts observed in trans-${\left(\mathrm{CD}\right)}_x$ provide new information about the internal modes of the excitation. Saturation of the signal at low levels is discussed in terms of a photoassisted decay channel.