By H. C. Wolf (auth.), Professor Dr. Peter Reineker, Professor Dr. Dr. h. c. Hermann Haken, Professor Dr. Hans Christoph Wolf (eds.)
This quantity includes the talks offered on the foreign Symposium on digital Excitations and interplay procedures in natural Molecular Aggre gates which used to be held at Schloss Elmau, Bavaria, Germany from June five to June 10, 1983. within the contemporary years the research of natural fabrics has built speedily and has ended in the development of fabrics with attention-grabbing right ties. the invention of hugely accomplishing and superconducting natural fabrics is among the purposes for the large bring up in learn acti vity during this box. attention-grabbing functions were discovered or look pos sible, corresponding to the applying of natural fabrics in electrophotography. The conductivity of natural polymers will be different inside a wide range via doping and such fabrics were used to build an natural battery. it slow in the past it was once advised that natural glasses and polymers will be used as stor age fabrics in machine expertise. With the advance of guidance tech niques and glossy tools of research, for instance, excessive answer and picosecond spectroscopy, a large number of experimental facts is offered not just for the undertaking fabrics but additionally for natural semiconductors and in sulators. With this swift accumulation of experimental fabric the microscopic theoretical figuring out couldn't preserve pace.
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Extra resources for Organic Molecular Aggregates: Electronic Excitation and Interaction Processes Proceedings of the International Symposium on Organic Materials at Schloss Elmau, Bavaria, June 5–10, 1983
Example text
Cos ka (1) where k is the wave vector, Eo is the energy of the centre of the band and a the intermolecular distance. Since f! is positive in TCB the k = 0 states are at the top of the band. Each of the exciton k states, however, is split into three spin components and since we are dealing with translationally equivalent molecules we would expect that this splitting is the same as for isolated TCB molecules (see Fig. 1). About a decade ago Francis and Harris showed that the zero-field splitting of the triplet exciton is slightly k dependent as a result of spin-orbit coupling (SOC) between triplet and singlet excitons with the same value of k [7].
C. Wolf, J. Phys. C5a, 101 (1971) 6. -K. Hong and R. Kopelman, J. Chern. Phys. 55, 72 (1971) 7. a. B. Velicky, S. Kirkpatrick and H. Ehrenreich, Phys. Rev. 175, 747 (1968) ~J. Hoshen and J. Jortner, J. Chern. Phys. 56, 933 (1972) 8. H. Port, K. Mistelberger and D. Rund, Mol. Cryst. Liq. Cryst. 50, 11 (1979) 9. ~ Port, D. Rund, G. Small and V. Yakhot, Chern. Phys. 39,175 (1979) 10. ~ Port, D. C. Wolf, Chern. Phys. 60, 81 (1981) 11. U. Doberer, H. Port, D. Rund and W. Tuffentsammer, Mol. Phys. 11, 1 (1983) 12.
Several general observations can be made concerning spectra of monomolecular organic solids such as displayed in Fig. I and 2: (a) while the energy distribution curves (EDC's) are still fairly simple for molecular crystals formed by small organic molecules, like for instance benzene, the spectra become more crowded with increasing size; (b) the solid state spectra exhibit a one to one correspondence to those of the gas phase. This is a consequence of the prevailing tight binding situation in molecular crystals where the individual molecules, held together by the weak van der Waals forces,are only slightly affected by the solid environment; (c) all bands in the solid state are shifted to lower binding energies relative to the gas phase by L'lER '" 1-2 eV due to the intermolecular relaxation of the surrounding medium once a hole is created on one of the molecules during the photoemission process [13]; (d) the bands are considerably broadened in the solid state relative to the gas phase Several mechanisms have been discussed for this broadening, which is also observed for solid films formed by condensed simple di- and triatomic gases[ 14]; (e) the uppermost filled valence bands originate from pure TI orbitals; at about 10 eV binding energy TI and a bands start to overlay; at even larger binding energies from about IS to 19 eV we expect pure a bands and finally at energies in excess of about 19 eV bands with essential 2s character are expected.