Second- and Third-order Raman Scattering in Bulk and Glass-embedded Nanometric CdS1 – xSex Crystals
Second- and third-order Raman spectra of bulk and nanometric CdS1 – xSex crystals were measured. At off-resonance excitation conditions the second-order Raman spectra of bulk CdS1 – xSex exhibit anharmonic coupling of optical phonons and two-phonon states with the participation of acoustic phonons....
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| Main Author: | |
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| Format: | Article |
| Language: | English |
| Published: |
Sumy State University
2014-11-01
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| Series: | Журнал нано- та електронної фізики |
| Subjects: | |
| Online Access: | http://jnep.sumdu.edu.ua/download/numbers/2014/4/articles/jnep_2014_V6_04006.pdf |
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| Summary: | Second- and third-order Raman spectra of bulk and nanometric CdS1 – xSex crystals were measured. At off-resonance excitation conditions the second-order Raman spectra of bulk CdS1 – xSex exhibit anharmonic coupling of optical phonons and two-phonon states with the participation of acoustic phonons. Resonant Raman spectra of CdS1 – xSex single crystals with a strong enhancement of multiple LO phonon bands show the evidence for the strong electron-phonon coupling in bulk CdS1 – xSex crystals. From the ratio of intensities of multiple and single LO phonon bands in the resonance Raman spectra of the glass-embedded CdS1 – Sex nanocrystals one may conclude that the electron-phonon coupling in the nanocrystals is much smaller than in the corresponding bulk materials. |
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| ISSN: | 2077-6772 |