Resonance Raman, hyper-Raman, and hyper-Rayleigh depolarization ratios and symmetry breaking in solution
| Autor: | Guillermo C. Bazan, Anne Myers Kelley, Glenn P. Bartholomew, Lian C. T. Shoute, Mireille Blanchard-Desce |
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| Rok vydání: | 2006 |
| Předmět: |
010304 chemical physics
Scattering Chemistry Biophysics Resonance Hyperpolarizability Depolarization 010402 general chemistry Condensed Matter Physics 01 natural sciences Molecular physics 0104 chemical sciences symbols.namesake Nuclear magnetic resonance Polarizability 0103 physical sciences symbols Depolarization ratio Physics::Chemical Physics Physical and Theoretical Chemistry Rayleigh scattering Raman spectroscopy Molecular Biology |
| Zdroj: | Molecular Physics. 104:1239-1247 |
| ISSN: | 1362-3028 0026-8976 |
| DOI: | 10.1080/00268970500525663 |
| Popis: | The depolarization ratios in resonance Raman, resonance hyper-Raman and resonance hyper-Rayleigh scattering have been measured for two octupolar conjugated organic chromophores that possess nominal threefold symmetry, crystal violet (CV) and 1,3,5-tris[4-[(1E)-2-(4-nitrophenyl)-ethenyl]phenyl]benzene (TPB(PV)1(NO2)). For comparison, the same quantities are measured for two dipolar donor–acceptor substituted conjugated molecules. The dipolar molecules both exhibit depolarization ratios of for resonance Raman and ρ = 1/5 for hyper-Rayleigh and hyper-Raman, consistent with the polarizability and the hyperpolarizability tensors having a single non-zero element. The resonance hyper-Rayleigh scattering from both of the octupolar molecules exhibits a depolarization ratio close to the value of 2/3 expected for D3h or D3 symmetry, but the resonance Raman and resonance hyper-Raman depolarization ratios deviate significantly from the values expected for those symmetries. In TPB(PV)1(NO2), the depolarization ratios i... |
| Databáze: | OpenAIRE |
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