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- W2020104484 abstract "The Raman light to vibration coupling coefficients Cαβ of the l=0 and the l=2 spheroidal phonon modes of quasifree spherical CdSe/CdS core/shell nanoparticles are calculated. Based on the Lamb model, the displacement vectors of acoustic phonon modes are obtained and the Cαβ is also derived. The Raman scattering from quasifree CdSe/CdS nanoparticles with various inner radii is investigated. For the l=0 acoustic modes, the bond polarizability model is adopted to calculate Cαβ, whose peak positions shift toward lower frequencies with the increase in the inner radius. It could be accounted for by the decrease in the averaged longitudinal and transverse sound velocities. Moreover, the ratio of the coefficients Aαβγδ {Montagna and Dusi, [Phys. Rev. B 52, 10080 (1995)]} between layers characterizes behaviors of peak heights of Cαβ. For the l=2 modes based on the dipole-induced-dipole model, the behaviors of peak positions are obtained by varying values of vL and vT of materials in both layers. As we treat the core/shell nanoparticle as a whole, the behavior of Cαβ peak positions on a CdSe/CdS core/shell nanoparticle is consistent with its dependence on the averaged sound velocities of the whole nanoparticle. Meanwhile, it also agrees with the calculated results for a CdSxSe1−x one {Ristić et al., [J. Appl. Phys. 104, 073519 (2008)]}. However, we observed that some peaks reach dramatically high values for given inner radii of the CdSe/CdS nanoparticles, which occur only in the spherical core/shell nanoparticles." @default.
- W2020104484 created "2016-06-24" @default.
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- W2020104484 date "2010-10-15" @default.
- W2020104484 modified "2023-09-25" @default.
- W2020104484 title "Low-frequency Raman scattering from acoustic vibrations of spherical CdSe/CdS nanoparticles" @default.
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- W2020104484 doi "https://doi.org/10.1063/1.3499651" @default.
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