Photoexcitations in Pernigraniline: Ring-Torsional Polarons and Bond- Order Solitons.
Abstract
We report the first near-steady-state and long time photoinduced- absorption spectroscopies of pernigraniline base, a novel Peierls ground state polymer with multiple order parameters. Two kinds of defects have been observed and distinguished by differing time domains and ir active vibrations. The short- lived defect has a lifetime of msec scale and a defect mass of -5 m; in contrast, the lifetime of the long lived defect (mass -300 m) is greater than several hours at low temperatures. We propose that the short-lived excitation is a soliton defect in the bond length (order parameter or alternation), while the long-lived excitation is a polaron defect in the ring torsion angle order parameter.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 07, 1991
- Accession Number
- ADA239149
Entities
People
- H. J. Ye
- J. M. Ginder
- J. M. Leng
- R. P. Mccall
- Y Sun
Organizations
- University of Pennsylvania