Dispersion of Raman cross section in CdS and ZnO over a wide energy range

Robert Callender, S. S. Sussman, M. Selders, R. K. Chang

Research output: Contribution to journalArticle

140 Citations (Scopus)

Abstract

The dispersion of the Raman cross sections of several phonon modes in CdS and ZnO using a wide range of laser energies has been measured. The E1(LO) and multi-LO (2-LO, 3-LO and 4-LO) modes in CdS have been studied over the energy range extending from 0.45Eex (exciton energy) to 1.1Eex. For the E1(LO) mode, both the "forbidden" (zz) and allowed (zx) geometries were employed. The dispersive behavior of the cross section in these two geometries is in agreement with theory for energies below Eex. The dispersion of multi-LO-phonon scattering is also presented. For ZnO, the dispersion of the cross section for the E1(LO), E1(TO), A1(TO), and E2 modes was measured over the energy range of (0.57-0.76)Eex. The behavior of the LO modes is expalined in terms of a cancellation between the deformation and Fröhlich contributions to the LO scattering cross section. For the TO modes, resonant cancellation was not observed, in contrast to the results of recent studies of CdS and ZnS. A simple model is used to discuss these differences between the ZnO and CdS behavior. Finally, a resonant enhancement of the scattering from the 2-LO mode in ZnO when the scattered-photon energy was coincident with Eex is reported.

Original languageEnglish (US)
Pages (from-to)3788-3798
Number of pages11
JournalPhysical Review B
Volume7
Issue number8
DOIs
StatePublished - 1973
Externally publishedYes

Fingerprint

cross sections
energy
cancellation
geometry
scattering
scattering cross sections
excitons
augmentation
photons
lasers

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Dispersion of Raman cross section in CdS and ZnO over a wide energy range. / Callender, Robert; Sussman, S. S.; Selders, M.; Chang, R. K.

In: Physical Review B, Vol. 7, No. 8, 1973, p. 3788-3798.

Research output: Contribution to journalArticle

Callender, Robert ; Sussman, S. S. ; Selders, M. ; Chang, R. K. / Dispersion of Raman cross section in CdS and ZnO over a wide energy range. In: Physical Review B. 1973 ; Vol. 7, No. 8. pp. 3788-3798.
@article{80407b85ed76458c9d6fa11bed9f6a6b,
title = "Dispersion of Raman cross section in CdS and ZnO over a wide energy range",
abstract = "The dispersion of the Raman cross sections of several phonon modes in CdS and ZnO using a wide range of laser energies has been measured. The E1(LO) and multi-LO (2-LO, 3-LO and 4-LO) modes in CdS have been studied over the energy range extending from 0.45Eex (exciton energy) to 1.1Eex. For the E1(LO) mode, both the {"}forbidden{"} (zz) and allowed (zx) geometries were employed. The dispersive behavior of the cross section in these two geometries is in agreement with theory for energies below Eex. The dispersion of multi-LO-phonon scattering is also presented. For ZnO, the dispersion of the cross section for the E1(LO), E1(TO), A1(TO), and E2 modes was measured over the energy range of (0.57-0.76)Eex. The behavior of the LO modes is expalined in terms of a cancellation between the deformation and Fr{\"o}hlich contributions to the LO scattering cross section. For the TO modes, resonant cancellation was not observed, in contrast to the results of recent studies of CdS and ZnS. A simple model is used to discuss these differences between the ZnO and CdS behavior. Finally, a resonant enhancement of the scattering from the 2-LO mode in ZnO when the scattered-photon energy was coincident with Eex is reported.",
author = "Robert Callender and Sussman, {S. S.} and M. Selders and Chang, {R. K.}",
year = "1973",
doi = "10.1103/PhysRevB.7.3788",
language = "English (US)",
volume = "7",
pages = "3788--3798",
journal = "Physical Review B-Condensed Matter",
issn = "0163-1829",
publisher = "American Institute of Physics Publising LLC",
number = "8",

}

TY - JOUR

T1 - Dispersion of Raman cross section in CdS and ZnO over a wide energy range

AU - Callender, Robert

AU - Sussman, S. S.

AU - Selders, M.

AU - Chang, R. K.

PY - 1973

Y1 - 1973

N2 - The dispersion of the Raman cross sections of several phonon modes in CdS and ZnO using a wide range of laser energies has been measured. The E1(LO) and multi-LO (2-LO, 3-LO and 4-LO) modes in CdS have been studied over the energy range extending from 0.45Eex (exciton energy) to 1.1Eex. For the E1(LO) mode, both the "forbidden" (zz) and allowed (zx) geometries were employed. The dispersive behavior of the cross section in these two geometries is in agreement with theory for energies below Eex. The dispersion of multi-LO-phonon scattering is also presented. For ZnO, the dispersion of the cross section for the E1(LO), E1(TO), A1(TO), and E2 modes was measured over the energy range of (0.57-0.76)Eex. The behavior of the LO modes is expalined in terms of a cancellation between the deformation and Fröhlich contributions to the LO scattering cross section. For the TO modes, resonant cancellation was not observed, in contrast to the results of recent studies of CdS and ZnS. A simple model is used to discuss these differences between the ZnO and CdS behavior. Finally, a resonant enhancement of the scattering from the 2-LO mode in ZnO when the scattered-photon energy was coincident with Eex is reported.

AB - The dispersion of the Raman cross sections of several phonon modes in CdS and ZnO using a wide range of laser energies has been measured. The E1(LO) and multi-LO (2-LO, 3-LO and 4-LO) modes in CdS have been studied over the energy range extending from 0.45Eex (exciton energy) to 1.1Eex. For the E1(LO) mode, both the "forbidden" (zz) and allowed (zx) geometries were employed. The dispersive behavior of the cross section in these two geometries is in agreement with theory for energies below Eex. The dispersion of multi-LO-phonon scattering is also presented. For ZnO, the dispersion of the cross section for the E1(LO), E1(TO), A1(TO), and E2 modes was measured over the energy range of (0.57-0.76)Eex. The behavior of the LO modes is expalined in terms of a cancellation between the deformation and Fröhlich contributions to the LO scattering cross section. For the TO modes, resonant cancellation was not observed, in contrast to the results of recent studies of CdS and ZnS. A simple model is used to discuss these differences between the ZnO and CdS behavior. Finally, a resonant enhancement of the scattering from the 2-LO mode in ZnO when the scattered-photon energy was coincident with Eex is reported.

UR - http://www.scopus.com/inward/record.url?scp=0001320148&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0001320148&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.7.3788

DO - 10.1103/PhysRevB.7.3788

M3 - Article

VL - 7

SP - 3788

EP - 3798

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 0163-1829

IS - 8

ER -