Interchain photogeneration of charged solitons in trans-(CH)x

In a recent Letter1 Rothberg, Jedju, Etemad, and Baker (RJEB) used a novel photoinduced-absorption (PA) technique to study charged-soliton (S ?) dynamics in trans-(CH)X with picosecond resolution by measuring transient PA at 0.45 eV. Both intrachain and interchain photogeneration of S ? are reported. The former process occurs instantaneously, while the latter process is delayed by about 30 ps and was interpreted1 as neutral soliton (S?) to S ? conversion. In this Comment we would like to experimentally support and complement RJEB's measurements and to further discuss the interchain photogeneration process.