Optical Response Functions of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>F</mml:mi></mml:math>Center

Benedek, G.; Mulazzi, E.

doi:10.1103/physrev.179.906

Cited by 24 publications

(3 citation statements)

References 37 publications

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“…Other shells of ions are less directly affected by the F centre, but an indirect effect of the large outward displacements of NN cations is a substantial increase in the central force constant for third neighbor (shell-3) anions. An analogous effect has been reported for the F centre in KC1 [3]. The foregoing results lead us to re-interpret the measured Raman spectra in the optic mode region.…”

Section: Q E ( I~~) ' '~supporting

confidence: 82%

RAMAN AND INFRA-RED STUDIES OF DEFECTSTheory of F-centre Raman scattering in SrF₂

1980

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Abstract. -Forces and force-constant changes for the F centre in SrF 2 were calculated from a point-ion-model, ground-state wave function. The predicted negative central-force-constant change for NN cations is in essential agreement with the value inferred from measured Raman spectra by Glynn, Hayes and Wiltshire. The predicted force-constant change for NN anions is also negative, in contrast to the large positive value inferred from spectra. However, outward radial displacement of NN cations may produce a large, positive central force-constant change for those third-neighbor anions in line with NN cations. It now appears that the latter effect provides a better explanation for an observed A^ resonance in the Raman spectrum at 310 cm -1 than does a hypothetical positive force-constant change for NN anions.

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Section: Q E ( I~~) ' '~supporting

confidence: 82%

RAMAN AND INFRA-RED STUDIES OF DEFECTSTheory of F-centre Raman scattering in SrF₂

1980

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“…Benedek and Mulazzi [23] using absorption band shape parameters. However, strong discrepancies between experimental and calculated spectra appear: (i) I?…”

Section: First-order Spectramentioning

confidence: 99%

Raman scattering by KI containing F centres

Buisson

Lefrant

Sadoc

et al. 1976

Physica Status Solidi (b)

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Laboratoire de Physique Cristallinel), Uwiversitd Paris-#&, Orsay=) ( a ) and Labmatoire d'0ptique Physique de l'E.KP.C.I.a) Paris4) ( b )Raman Scattering by HI Containing F Centres BY J. P. BUISSON (a), S. LEFRLCNT (a), A. SADOC (a), L. TAUREL (a), and M. BILLARDON (b)Raman spectra of KI (F centres) are described and calculated in the "off resomnw" approximation neglecting the spin of the F centre electron. The theory predicts a very intense I ? : resonant mode a t 96 cm-' in agreement with the experiment but is unable to account for the observed depolarization of this mode. Application of Henry's theory shows that this effect can be partially due to the spin-orbit coupling of the F centre in its first excited state.Les spectres Raman de HI (centres F) sont decrits et calculh en dehors des conditions de resonance et en negligeant le spin du centre F. La theorie prevoit bien un mode intense &sonant B 96 cm-l de symbtrie l?: mais ne rend pas compte de la d6polarisation experimentale de la raie. L'application de la theorie de Henry montre que le terme de couplage spin orbite du centre F au ler &at excite peut interpreter, tout au moins en partie, cette anomalic.

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“…Since in that case the more important electron phonon interaction in the excited electronic state is that transforming according to the r: irreducible representation of the local site symmetry Oh [7], the breakdown is proved by the appearance of the T: density of phonon states in all the polarized spectra for every incident and scattered light polarizations.…”

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Raman Scattering in Resonance With the Absorption Band of the F Centre in Alkali Halides : Breakdown of the Scattering Selection Rules Due of the Spin Orbit Interaction

Mulazzi

Bishop

1976

J. Phys. Colloques

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Résumé. -Nous présentons la théorie et les évaluations numériques pour la section de la diffusion Raman en résonance avec les bandes d'absorption F des centres F dans les cristaux d'halogénure alcalin, caractérisés par un couplage d'interaction spin orbite X différent de zéro dans les états électro-niques excités. On montre que pour toutes les polarisations de la lumière incidente et diffusée les sections de la diffusion Raman pour les densités d'états phononiques ri", rj et rt sont toujours différentes de zéro. La théorie est appliquée aux deux cas particuliers des centres F dans les cristaux de Kl et CsF.Abstract. -We present the theory and the theoretical evaluations for the cross sections of the polarized Raman scattering in resonance with the F absorption bands of the F centres in alkali halides, characterized by a spin orbit interaction coupling coefficient A different from zero in the excited electronic states. We show that for all the polarizations of the incident and scattered light the cross sections of the scattering processes determined by the densities of phonon states transforming according to the irreducible representations r^, rj, /£ are always different from zero. The theory is applayed to the particular cases of the F centres in CsF and in KI.Introduction. -We report the results of the first theoretical calculations that prove the breakdown of the usual selection rules [1] for first-order resonant Raman scattering induced by defects that are characterized by a spin degenerate ground state and degenerate excited state with strong spin orbit interaction. The present results extend those of a recent general theory [2] which predicts that selection rules for Raman scattering from defects depend not only on the symmetry of the defect site but also on the electronic structure of the defect [2]. Here we show that due to the spin orbit interaction in the excited electronic state new selection rules are valid ; in O h symmetry these state that for all the polarizations of the incident and scattered light the cross sections of the scattering processes determined by the densities of phonon states

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Optical Response Functions of theFCenter

Cited by 24 publications

References 37 publications

RAMAN AND INFRA-RED STUDIES OF DEFECTSTheory of F-centre Raman scattering in SrF₂

RAMAN AND INFRA-RED STUDIES OF DEFECTSTheory of F-centre Raman scattering in SrF₂

Raman scattering by KI containing F centres

Raman Scattering in Resonance With the Absorption Band of the F Centre in Alkali Halides : Breakdown of the Scattering Selection Rules Due of the Spin Orbit Interaction

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Optical Response Functions of theFCenter

Cited by 24 publications

References 37 publications

RAMAN AND INFRA-RED STUDIES OF DEFECTSTheory of F-centre Raman scattering in SrF2

RAMAN AND INFRA-RED STUDIES OF DEFECTSTheory of F-centre Raman scattering in SrF2

Raman scattering by KI containing F centres

Raman Scattering in Resonance With the Absorption Band of the F Centre in Alkali Halides : Breakdown of the Scattering Selection Rules Due of the Spin Orbit Interaction

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RAMAN AND INFRA-RED STUDIES OF DEFECTSTheory of F-centre Raman scattering in SrF₂

RAMAN AND INFRA-RED STUDIES OF DEFECTSTheory of F-centre Raman scattering in SrF₂