Lattice Vibrations of LaCl3 and LaBr3 from Vibronic Spectra
| Autor: | Isaac Richman, Eugene Y. Wong, Robert A. Satten |
|---|---|
| Rok vydání: | 1963 |
| Předmět: |
Scattering
Chemistry Analytical chemistry General Physics and Astronomy Polarization (waves) Molecular physics Spectral line Vibronic coupling symbols.namesake Normal mode Physics::Atomic and Molecular Clusters symbols Vibronic spectroscopy Physics::Chemical Physics Physical and Theoretical Chemistry Raman scattering Excitation |
| Zdroj: | The Journal of Chemical Physics. 39:1833-1846 |
| ISSN: | 1089-7690 0021-9606 |
| DOI: | 10.1063/1.1734539 |
| Popis: | The polarized vibronic spectra of PrCl3 and PrBr3, as well as Pr3+ in LaCl3 and LaBr3, were observed. The theory of vibronic transitions for the dilute salt is shown to predict a spectrum which closely resembles the vibronic spectrum of the pure salt, in agreement with experiment. Approximations valid when the optical vibrational branches of the crystal are flat leading to k=0 selection rules are shown to lead to agreement with the spectra fairly well, although slight violations in selection rules occur and can readily be explained. Tentative identifications of crystalline modes of vibration are assigned partly with the help of polarization data and vibronic selection rules, partly by consideration of frequency shift in comparing the chloride and bromide vibronic spectra, partly from Raman scattering data, and partly with the aid of the far‐infrared absorption data of Buchanan, Murphy, and Caspers. The vibronic data in turn help refine the interpretation of the far‐infrared results. The difference between longitudinal and transverse vibrating frequencies is discussed. |
| Databáze: | OpenAIRE |
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