@phdthesis{oai:konan-u.repo.nii.ac.jp:00000020,
 author = {尾枝, 芳隆 and Oeda, Yoshitaka},
 month = {2015-03-10},
 note = {平成9年度(1997年度), application/pdf, A novel experimental method, based on the technology to determine the singlet lowest exciton bandwidth in molecular crystals is reported here. In this method the analysis of the excitation spectrum in microcrystallites is used as a key tool to determine the exciton bandwidth. Analyzing the excitation spectra of pyrene microcrystallites at 2K, we have found that the lowest 1Lbsinglet exciton bandwidth increases superlinearly with microcrystallite size toward a maximum value of 330 cm-1, which is interpreted to be the bandwidth of the lowest exciton band(1Lb band) in the bulk crystal.The bandwidth of the bulk crystal thus obtained is discussed in connection with the Davydov splitting of only 15 cm-1. The bandwidths in small microcrystallites are interpreted in terms of the energy separation calculated by the Frenkel exciton theory. Using the bandwidth obtained for bulk pyrene crystal and exciton-phonon coupling constant, the lattice relaxation energy for the 1Lb exciton has been estimated to be 180 cm-1 and the self-trap depth for the V state to be 15cm-1.We have found that the k selection rule for the exciton creation is not applicable in small size pyrene microcrystallites, but it is applicable to microcrystallites larger than 50 A°. Comparing the exciton bandwidth in pyrene and anthracene microcrystallites, it is found that the exciton surface scattering does not occur in pyrene microcrystallites but it occurs strongly in anthracene microcrystallites. The surface scattering layer thickness in anthracene microcrystallites is found to be 30 A°.},
 school = {甲南大学},
 title = {Excitonic Processes in Aromatic Microcrystallites and Bulk Exciton Bandwidths},
 year = {},
 yomi = {オエダ, ヨシタカ}
}