The Raman peaks of high performance cis-rich polyacety]ene(HPPA) shift to higher energies as the excitation energy increases. This implies that a shorter chain can be effectively excited by higher excitation energy

and a longer chain can be effectively excited by lower excitation energy. The blue-shift of the dominant peaks in the Raman spectrum of stretched HPPA compared with that of HPPA is observed

indicating the decrease of the interchain distance due to stretching. The luminescence spectra for HPPA and stretched HPPA with various excitation wavelengths are reported.We find that the luminescence spectrum of HPPA shifts to higher energies with the increase of excitation energy

and this blue-shift of the luminescence spectrum decreases with the decrease of the interchain distance. We suggest that there exists the interchain energy transfer in HPPA

which becomes faster as the interchain distance decreases.