Orientation des molécules d'eau dans le cristal ClO<sub>4</sub>Li.3H<sub>2</sub>O

Couture-Mathieu, L.; Mathieu, J.-P.

doi:10.1107/s0365110x53000831

Cited by 3 publications

(4 citation statements)

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“…This symmetry is seen, for example, in the results of Couture-Mathieu and Mathieu. 7 Straightforward considerations show that depolarization errors of the type described above do not enter into observations of a xz , a yz , a zx , and a zv . Measure-FIG.…”

Section: Discussionmentioning

confidence: 96%

Depolarization of Raman Scattering in Calcite

Porto¹,

Giordmaine²,

Damen³

1966

Phys. Rev.

242

105

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Measurements of depolarization of Raman scattering from the totally symmetric A i a vibration in calcite (v = 1086 cm^1) are reported. The results, obtained with highly collimated gas-laser exciting light, show no evidence of the anomalous values of a xy previously reported, and are fully consistent with Raman selection rules based on point symmetry. The phenomenon of apparent depolarization due to interference effects in convergent polarized light is discussed in detail.

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Section: Discussionmentioning

confidence: 96%

Depolarization of Raman Scattering in Calcite

Porto¹,

Giordmaine²,

Damen³

1966

Phys. Rev.

242

105

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“…17,18). Only transverse modes should be seen in infrared absorption spectra at normal incidence, but both may be observed in Raman spectra (17,19) The foregoing interpretation can easily be verified, since strong infrared absorption bands are usually complicated by a reflection shoulder extending to the longitudinal frequency v, (20,21), a phenomenon which, however, should not be observed if the sample thickness is less than one wavelength of the incident radiation (22).…”

Section: B Piezoelectric Nature Of Crystalline Simentioning

confidence: 99%

Infrared and Raman spectra of liquid and crystalline silicon tetrafluoride

Bessette¹,

Cabana²,

Fournier³

et al. 1970

Can. J. Chem.

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The Raman and infrared spectra of liquid and crystalline SiF, have been recorded. The assignment of some of the Raman bands of the crystal to longitudinal modes has been confirmed by the infrared reflection spectrum. These indicate that the crystal structure is not centrosymmetric. In other respects the spectra are also more complicated than is expected on the basis of the previously reported Td3 structure. Possible explanations are discussed.On a enregistre les spectres Raman et infrarouges de SiF4 dans ses Ctats condenses. Certaines bandes Raman du cristal, attribuCes a des modes longitudinaux de par le spectre de reflexion infrarouge, indiquent que la structure du cristal n'est pas centrosymetrique. Les spectres sont par ailleurs plus compliquCs que ceux predits d'apres la structure cristalline Td3 proposCe antkrieurement. On apporte quelques explications a ces anomalies.

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“…To linear terms in E, y^ei(q.r-a > «) < Substituting (7) into (6) and retaining only linear terms, we obtain (8) where Vi is the group velocity of the electron. Equation (8) can be simplified for semiconductors where qv;<Co> in the frequency range of interest. Therefore, to a good approximation /'=-…”

Section: High-frequency Electrical Conductivitymentioning

confidence: 99%

“…One can also use mobility and Hall-effect measurements to determine intervalley transfer 8,9 but, as we pointed out above, one cannot make a one-to-one correspondence between the mobilities and the valleys, i.e., masses. In other words, both plasma and mobility measurements are useful but they do not measure the same thing.…”

Section: Introductionmentioning

confidence: 99%

Plasma Frequency as a Test of Intervalley Transfer in the Gunn Effect

Omar

1968

Phys. Rev.

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We propose a test whereby the intervalley transfer of electrons in semiconductors under the influence of a high electric field can be determined. The same experiment can be used also to determine the electron temperature. The present test is based on the fact that as the transfer occurs, the plasma frequency of the electrons undergoes an appreciable change because the masses of the different valleys differ considerably.

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Orientation des molécules d'eau dans le cristal ClO₄Li.3H₂O

Cited by 3 publications

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Depolarization of Raman Scattering in Calcite

Depolarization of Raman Scattering in Calcite

Infrared and Raman spectra of liquid and crystalline silicon tetrafluoride

Plasma Frequency as a Test of Intervalley Transfer in the Gunn Effect

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Orientation des molécules d'eau dans le cristal ClO4Li.3H2O

Cited by 3 publications

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Depolarization of Raman Scattering in Calcite

Depolarization of Raman Scattering in Calcite

Infrared and Raman spectra of liquid and crystalline silicon tetrafluoride

Plasma Frequency as a Test of Intervalley Transfer in the Gunn Effect

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Orientation des molécules d'eau dans le cristal ClO₄Li.3H₂O