Summary
The second-order Raman scattering and infra-red absorption spectra of 2H−SnS2 are reported. The temperature, excitation wavelength and polarization dependences of Raman spectra are studied; resonance effects are put in evidence. The assignment of the second-order bands is discussed on the basis of the appliable selection rules. The role of phonons of high symmetry points different from Γ in second-order spectra is also taken into account.
Riassunto
Sono riportati gli spettri di scattering Raman e assorbimento IR del second'ordine nel 2H−SnS2. È stata studiata la dipendenza degli spettri Raman dalla temperatura, dalla lunghezza d'onda di eccitazione e dalla polarizzazione; sono messi in evidenza effetti di risonanza. Le assegnazioni delle bande del second'ordine sono discusse in base alle regole di selezione applicabili. Negli spettri del second'ordine sono stati considerati i contributi dei fononi dei punti di alta simmetria diversi da Γ.
Резюме
Исследуется Рамановское рассеяние второго порядка и спектры инфракрасного поглощения 2H−SnS2. Изуачвются зависимости Рамановских спектров от температуры, длины волны возбуждения и поляризации; также учитываются резонансные эффекты. На основе правил отбора обсуждается задание зон второго порядка. При исследовании учитывается роль фононов для точек высокой симметрии, отличных от Г, в спектрах второго порядка.
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Work partially supported by M.P.I.
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Cingolani, A., Lugarà, M. & Scamarcio, G. Second-order Raman scattering and infra-red absorption in SnS2 . Il Nuovo Cimento D 10, 519–528 (1988). https://doi.org/10.1007/BF02453293
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DOI: https://doi.org/10.1007/BF02453293