“…Other areas such as the classification of disorder and extrinsic order in the polymer (182), particularly hydrogenated polyacetylenes (183), the cis isomer (184,185), and the results of using ultraviolet laser excitation (186), have also been reported. Studies on the effects of doping on this polymer and similar polymers have been reported, using both electron donors and acceptors as the doping agent (187)(188)(189)(190). Polyethylene has also been studied in some detail, and areas of interest include conformational studies (191), flowing melts (192), studies on orientation (193) and chain branching (194), and the correlation of structural data with longitudinal acoustic modes in polyethylenes (195,196).…”