We present a momentum dependent electron energy-loss study of the electronic excitations in TPD [N, N’-diphenyl-N, N’-bis(3-methyl-phenyl)-1,1’biphenyl-4,4’diamine] and compare our results to calculations based upon semiempirical post Hartree-Fock methods. Our experiment probes the dynamic structure factor (Formula presented) and the experimental results are in good agreement with the calculations indicating that the size of the primary gap exciton along the molecule is comparable to the length of the molecule. Calculations of the excited state bond-length relaxation can be interpreted in terms of the formation of polaron excitons.
|Original language||English (US)|
|Number of pages||4|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Jan 1 2000|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics