Structure in the temperature dependence of the lifetime of the excited F-center in KCl

Silva, L. Da; Aguero, G.; Lagos, Miguel; Cáceres, E.

doi:10.1016/0022-2313(87)90182-7

Cited by 5 publications

(5 citation statements)

References 4 publications

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“…Only recently did Caceres et al [35] repeat the measurements in additively coloured samples, by using a better apparatus, and quoted Bosi results and suggestions: data presented in their figures [35] are once more very similar to those [33,34] previously obtained in Madrid and in Milano. Nevertheless they did not attempt either to investigate the variation of the sharp features of ZR as a function of the sample concentration or to study any effect on Yr.…”

Section: H~l) E(t) = E(o) -B Ctgh ~ (2) ( Ho~2 ) H 2 (T) = H 2 (0) supporting

confidence: 83%

“…strongly evidencing the existence of a complex structure superimposed to the smooth curve va (T) found previously in the literature. Indeed for less accurate temperature control, as currently used, sharp variations of ~R with temperature are averaged, and the structure is not detectable [33][34][35]. Starting from a historical point of view, this occurrence was first observed in 1975 by Alvarez-Rivas and by his student Caceres in v-rays irradiated KC1 samples, containing rather high quantity of aggregate centres.…”

Section: H~l) E(t) = E(o) -B Ctgh ~ (2) ( Ho~2 ) H 2 (T) = H 2 (0) mentioning

confidence: 97%

“…In fact, they explained [35] the sharp variations of ZR in terms of a nonadiabatic effect which involves the change of the emission energy with temperature as well as the boundary conditions for the light at the surface of the crystal. We prefer a different explanation.…”

Section: H~l) E(t) = E(o) -B Ctgh ~ (2) ( Ho~2 ) H 2 (T) = H 2 (0) mentioning

confidence: 97%

“…Finally, we want to discuss another effect: a temperature-dependent fine structure in VR values (experimentally observed in KC1 [33][34][35]): sharp variations of rR values (up to __ 15 percent) are observed when the temperature control of the sample is better than a few hundredth of a degree, i.e. strongly evidencing the existence of a complex structure superimposed to the smooth curve va (T) found previously in the literature.…”

Section: H~l) E(t) = E(o) -B Ctgh ~ (2) ( Ho~2 ) H 2 (T) = H 2 (0) mentioning

confidence: 99%

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Speculations on the absorption and emission properties of the F-centre in alkali halides

Bosi

Nimis

1991

Il Nuovo Cimento D

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(ricevuto il 21 Febbraio 1991; revisionato il 18 Luglio 1991; approvato il 29 Luglio 1991) Summary. --A review of acquisitions and of unresolved problems concerning Fcentres in alkali halides is presented. The main conclusions are a) the temperature dependence of the bands is mainly due to the thermal expansion for the absorption process and to electron-phonon interaction for the emission process: for the latter half-width and Huang-Rhys factor values are related to the transverse optical frequency ones; b) the lifetime VR of the relaxed excited state is not intrinsic at low temperature because of the interaction between F-and a-centres always present in real samples; c) even though the absolute quantum yield decreases when F-centre concentration increases, the relative quantum yield vr is unaffected by change on F-centre concentration, strongly evidencing a nonhomogeneous distribution of F-centres in real samples; d) a temperature-dependent fine structure in zR (an Vr) values is observed but only when temperature control of the samples is better than a few hundredth of a degree: this effect has been interpreted in terms of interactions which involve F-, a-and F'-centres. PACS 61.70 -Defects in crystals. PACS 61.70.Dx -Colour centres.

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Section: H~l) E(t) = E(o) -B Ctgh ~ (2) ( Ho~2 ) H 2 (T) = H 2 (0) supporting

confidence: 83%

Section: H~l) E(t) = E(o) -B Ctgh ~ (2) ( Ho~2 ) H 2 (T) = H 2 (0) mentioning

confidence: 97%

Section: H~l) E(t) = E(o) -B Ctgh ~ (2) ( Ho~2 ) H 2 (T) = H 2 (0) mentioning

confidence: 97%

Section: H~l) E(t) = E(o) -B Ctgh ~ (2) ( Ho~2 ) H 2 (T) = H 2 (0) mentioning

confidence: 99%

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Speculations on the absorption and emission properties of the F-centre in alkali halides

Bosi

Nimis

1991

Il Nuovo Cimento D

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“…In analyzing the temperature dependence, using [20,21], no such measurements have been made on At, since 1970 [13]. Nowa-…”

Section: (23)mentioning

confidence: 99%

Stark Effect and the F‐Center Excited States

Ponnambalam

1989

Physica Status Solidi (b)

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Using a simple model of the F‐center, it is shown that whether the |2Γ 4−〉 state is above or below |2Γ 1+〉 in emission is not quite clear from the existing Stark data. In light of this, the relative merits of the different Stark effects are critically analyzed. It is shown that fresh data on the field‐induced changes in the radiative life‐time can unambiguously settle the relative position of the |2Γ 4−〉 state with respect to |2Γ 1+〉.

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Lifetime of the F‐Center in KCl Crystals Excited with K‐Light

Silva

1992

Physica Status Solidi (b)

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Structure in the temperature dependence of the lifetime of the excited F-center in KCl

Cited by 5 publications

References 4 publications

Speculations on the absorption and emission properties of the F-centre in alkali halides

Speculations on the absorption and emission properties of the F-centre in alkali halides

Stark Effect and the F‐Center Excited States

Lifetime of the F‐Center in KCl Crystals Excited with K‐Light

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