Exciton band of a one-molecule-per-unit-cell crystal: hexamethylbenzene first singlet
dc.contributor.author | Woodruff, Steven D. | en_US |
dc.contributor.author | Kopelman, Raoul | en_US |
dc.date.accessioned | 2006-04-07T17:11:15Z | |
dc.date.available | 2006-04-07T17:11:15Z | |
dc.date.issued | 1977-05-15 | en_US |
dc.identifier.citation | Woodruff, S. D., Kopelman, R. (1977/05/15)."Exciton band of a one-molecule-per-unit-cell crystal: hexamethylbenzene first singlet." Chemical Physics 22(1): 1-12. <http://hdl.handle.net/2027.42/22919> | en_US |
dc.identifier.uri | http://www.sciencedirect.com/science/article/B6TFM-44FDJYH-C1/2/3f316ae53f0302e6e055ef36da22817f | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/22919 | |
dc.description.abstract | The exciton band structure has been determined experimentally, from quantitative band--band fluorescence and absorption measurements, for the first singlet excited state of the low temperature phase of the hexamethylbenzene crystal. At 2 K, the center for the band is at 35156 cm-1, its bottom (the [kappa] = 0 state) at 35134 cm-1 and its total extent about 40 cm-1 (i.e. much larger than anticipated earlier). We derive a dispersion relation, based on the trigonal topology of the crystal, with six out-of-plane nearest neighbor pairwise interactions of -3.3 cm-1 and six in-plane ones of -0.4 cm-1. These parameters, based on the exciton band shape, are inconsistent with a transition-multiple--transition-multipole model, and in particular with an octopole--octopole one, based on the [pi] electrons. [pi]-[sigma] interactions are suggested. The neat crystal data are fully consistent with a complete concentration study on isotopic mixed samples of hexamethylbenzene, at 2 K, by absorption and fluorescence spectra with a 1 cm-1 resolution. The mixed crystal results are also consistent with the energy and spectral moments given by the separated-band model and with the behaviour expected from cluster percolation and exciton percolation. | en_US |
dc.format.extent | 974635 bytes | |
dc.format.extent | 3118 bytes | |
dc.format.mimetype | application/pdf | |
dc.format.mimetype | text/plain | |
dc.language.iso | en_US | |
dc.publisher | Elsevier | en_US |
dc.title | Exciton band of a one-molecule-per-unit-cell crystal: hexamethylbenzene first singlet | en_US |
dc.type | Article | en_US |
dc.rights.robots | IndexNoFollow | en_US |
dc.subject.hlbsecondlevel | Physics | en_US |
dc.subject.hlbsecondlevel | Mathematics | en_US |
dc.subject.hlbtoplevel | Science | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Department of Chemistry, The University of Michigan, Ann Arbor, Michigan 48109, USA | en_US |
dc.contributor.affiliationum | Department of Chemistry, The University of Michigan, Ann Arbor, Michigan 48109, USA | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/22919/1/0000484.pdf | en_US |
dc.identifier.doi | http://dx.doi.org/10.1016/0301-0104(77)85203-8 | en_US |
dc.identifier.source | Chemical Physics | en_US |
dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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