Impurity‐Induced Raman Spectra of Potassium Halides

Siederdissen, J. Höner Zu

doi:10.1002/pssb.2220730122

Cited by 11 publications

(1 citation statement)

References 10 publications

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“…The spectra of six of the twelve crystals of different x values (shown in figure 2) were symmetry analysed in this way at 10 K, with a result illustrated in figure 3 for five typical selected crystals. While the monovalent cationic impurities in alkali halides (such as TI+, Ag+, Cs+ and Rb+ in KCl) studied so far induce Raman spectra of only E, and TZg symmetry (Harley eta1 1971, Nair and Walker 1973, Honer zu Siederdissen 1976, NaCl : Kf and KCl : Na+ are unique in yielding Raman spectra of all three symmetries.…”

Section: Experimental Techniques and Resultsmentioning

confidence: 99%

Raman scattering of mixed K_1-xNa_xCl crystals

Hilbert¹,

Strauch²,

Miyanaga³

et al. 1989

J. Phys.: Condens. Matter

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Raman scattering for NaxK1-xCl single crystals with 12 different Na concentrations x has been measured at 300 and 10 K. The cationic-disorder-induced Raman effect in the one-phonon region 0-200 cm-1 has been experimentally analysed in terms of spectral structure, symmetry and relative strength as a function of Na concentration x. For low concentrations (3-6%) of Na+ or K+ single defects or defect pairs, theoretical calculations have been performed based on the semi-classical off-resonance theory with a Green function-breathing shell model approach in the average T-matrix approximation. The agreement between calculated and experimental spectra can be considerably improved by basing the model on inter-ionic (rather than intra-ionic) polarisability and by extending coupling and force-constant changes beyond the first to second and fourth neighbours of the defect. Some serious discrepancies, however, remain unresolved.

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Section: Experimental Techniques and Resultsmentioning

confidence: 99%

Raman scattering of mixed K_1-xNa_xCl crystals

Hilbert¹,

Strauch²,

Miyanaga³

et al. 1989

J. Phys.: Condens. Matter

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Disorder‐induced Raman scattering in non‐crystalline films of alkaline‐earth halides

Harbach

1979

Physica Status Solidi (b)

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Above 50 cm-l the Raman spectrum of quench-condensed thin films of SrCl,, BaCl,, and BaFCl can be interpreted as a weighted one-phonon density of states according t o the theory of Shuker and Gammon. The weighting emphasizes those normal modes that are related t o the Ramanactive Fzg mode of the chlorine ions in a fluorite lattice: The maximum of the weighted density of states of non-crystalline SrCI, is situated at 180 cm-l, of BaCI, and BaFCl at 160 cm-l. Above 50 cm-l the depolarization ratio is approximately frequency independent and fluctuates around 0.5. Das Ramanspektrum abschreckend kondensiecter dunner SrC1,-, BaC1,-und BaFC1-Schichten kann fur Frequenzverschiebungen ab ca. 50 cm-l entsprechend der Theorie von Shuker und Gammon als gewichtete Einphononenzustandsdichte interpretiert werden. Durch die Wichtung werden diejenigen Normalschwingungen im Ramanspektrum bevorzugt, die verwandt sind mit der ramanaktiven Feg-Schwingung der Chlorionen in einem Fluoritgitter. So liegt das Maximum der gewichteten Einphononenzustandsdichte von nichtkristallinem SrC1, bei 180 cm-l, von BaCl, und BaFCl bei 160 cm-l. Der Depolarisationsgrad ist weitgehend frequenzunabhiingig und liegt oberhalb 50 cm-' bei etwa 0,5.

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Absorption and Stress‐Induced Linear Dichroism of Pb⁺⁺ Centres in KCl and RbCl

Schmitt

1982

Physica Status Solidi (b)

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Absorption and Stress-Induced Linear Dichroisrn of Pb++ Centres in KCl and RbClThe optical absorption and the stress-induced linear dichroism (SLD) of Pb++-centres in KCI and RbCl are investigated in the temperature range 4 to 200 K. Using moments analysis the energy parameters of the systems, the effective electron-phonon-coupling constants of the (A) state, and the effective frequencies of the Ai,, E,, and Tzg interaction modes are determined. The temperature dependence of the B-band and the splitting of the C-band give additional information about the dynamical properties of the systems. The results imply that in either case the electronlattice interactions of the 3T1U state and of the 1T1, state are of comparable strength.Die optische Absorption und der druckinduzierte lineare Dichroismus (SLD) von Pb++-Zentren in KCI und RbCl werden im Temperaturbereich zwischen 4 und 200 K untersucht. Mit Hilfe der Momentenanalyse werden die Energieparameter der Systeme, die effektiven Elektron-Phonon-Kopplungskonstanten des lA)-Zustandes und die effektiven Frequenzen der Wechselwirkungsmoden bestimmt. Die Temperaturabhangigkeit der B-Bande und die Aufspaltung der C-Bande geben zusatzliche Information iiber die dynamischen Eigenschaften dieser Zentren. Die Ergebnisse zeigen, da13 in beiden Fallen die Elektron-Gitter-Wechselwirkungen des 3T1U-und des lTlu-Zustandes von vergleichbarer StLrke sind.

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Impurity‐Induced Raman Spectra of Potassium Halides

Cited by 11 publications

References 10 publications

Raman scattering of mixed K_1-xNa_xCl crystals

Raman scattering of mixed K_1-xNa_xCl crystals

Disorder‐induced Raman scattering in non‐crystalline films of alkaline‐earth halides

Absorption and Stress‐Induced Linear Dichroism of Pb⁺⁺ Centres in KCl and RbCl

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Impurity‐Induced Raman Spectra of Potassium Halides

Cited by 11 publications

References 10 publications

Raman scattering of mixed K1-xNaxCl crystals

Raman scattering of mixed K1-xNaxCl crystals

Disorder‐induced Raman scattering in non‐crystalline films of alkaline‐earth halides

Absorption and Stress‐Induced Linear Dichroism of Pb++ Centres in KCl and RbCl

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Product

Resources

About

Raman scattering of mixed K_1-xNa_xCl crystals

Raman scattering of mixed K_1-xNa_xCl crystals

Absorption and Stress‐Induced Linear Dichroism of Pb⁺⁺ Centres in KCl and RbCl