Temperature-Dependent Linewidth of Excited States in Crystals. I. Line Broadening due to Adiabatic Variation of the Local Fields

Kiel, A.

doi:10.1103/physrev.126.1292

Cited by 49 publications

(22 citation statements)

References 3 publications

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“…The spectra mainly show seven vibrational bands located at around 378, 418, 432, 451, 578, 645, and 751 cm -1 (labelled in Fig. 2 according to phonon modes), which was in good agreement with previous studies by Kadleikova [24], Kiel [25], and Aminzadeh [26]. The relative intensity (and the spectral position at band maximum) of these bands changed according to the directional characteristic of the crystal.…”

Section: Introductionsupporting

confidence: 85%

Raman tensor analysis of sapphire single crystal and its application to define crystallographic orientation in polycrystalline alumina

Munisso

Zhu

Pezzotti

2009

Physica Status Solidi (b)

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Raman selection rules were theoretically put forward and, according to the obtained relationships, the full set of Raman tensor elements was experimentally determined for the corundum structure of a sapphire single‐crystal. The knowledge of the Raman selection rules allowed us to represent the change in polarizability of the aluminium oxide molecule with respect to each of the available vibrational modes. Restrictions related to the symmetry of the scattering system are also discussed together with directional properties, thus leading to unambiguous assignment of the fundamental modes available in sapphire single‐crystal. From the experimental side, scattering intensities of Raman bands located at 378 cm–1 and 417 cm–1, which correspond to the Eg and the A1g phonon modes of the corundum structure, respectively, were collected in selected polarization configurations as a function of in‐plane rotation angle on different crystallographic planes. Fitting to theoretical equations (i.e., worked out for different crystallographic orientations) enabled us to unequivocally define the elements of the Raman tensor. Finally, a tensorial algorithm was proposed for the practical determination of unknown crystallographic textures in polycrystalline alumina materials, an issue of significant importance in materials science. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: Introductionsupporting

confidence: 85%

Raman tensor analysis of sapphire single crystal and its application to define crystallographic orientation in polycrystalline alumina

Munisso

Zhu

Pezzotti

2009

Physica Status Solidi (b)

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“…3 can also be fitted with Eq. (4). The values of T D that are required are: YA1G(560°K), YGaG(530°K), LuAlG(560°K), and LuGaG(440°K).…”

Section: Results and Discussion A Line Position Width And Intensitymentioning

confidence: 98%

Cr3+Fluorescence in Garnets and Other Crystals

Burns¹,

Geiss²,

Jenkins³

et al. 1965

Phys. Rev.

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The results of a study of the sharp-line fluorescence of Cr 3+ in a number of crystals is presented. The host crystals were several diamagnetic garnets, a spinel, and emerald. The results are used to discuss two aspects of the sharp-line energy levels. First, some of the dynamical aspects are considered. The measurements of the temperature dependence of the sharp no-phonon iMine positions, linewidths, and efficiencies are in reasonable agreement with the existing theory. The theory assumes a simple form for the interaction of the Cr 3+ energy levels with the phonons and uses a Debye density of states. The phonon-assisted radiation is also discussed. Second, some of the static aspects of the energy levels are considered. The splittings between the no-phonon R lines along with splittings of the ground states of the Cr 3+ in the same crystals are compared with the predictions of existing theories. Here the agreement is very poor. The experimental data show the difference between the Cr 3+ energy levels, when odd terms in addition to usual even crystal-field terms exist. The data also indicate some large nonlinearities between the energy-level splittings and the crystal field.

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“…The third term, Dn M i , in Eq. (1) is the contribution to the width from multiphonon emission processes, which are temperature independent and negligible in the temperature range of interest [17]. The last term Dn [11]:…”

Section: Debye Temperaturementioning

confidence: 99%

Inter-Stark Energy Levels and Effects of Temperature on Sharp Emission Lines of Nd3+ in LiYF4

Sardar

Yow

1999

phys. stat. sol. (a)

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The inter‐Stark components of the 4I9/2 and 4I11/2 manifolds have been characterized using the room‐temperature fluorescence spectra for the 4F3/2 → 4I9/2 and 4F3/2 → 4I11/2 transitions of Nd3+ in LiYF4 laser crystal. The thermal effects on the linewidths, positions, and line shifts of the inter‐Stark transitions of the 908 (R1 → X5) and 1052.4 (R1 → Y2) nm lines within the respective intermanifold transitions of 4F3/2 → 4I9/2 t and 4F3/2 → 4I11/2 t have been also investigated. The linewidths of these transitions are found to increase with increasing temperature. The 908 nm line is found to shift toward the shorter wavelength, while the 1052.4 nm line has shifted toward the longer wavelength. The experimental results of the temperature‐dependent widths and shifts of these sharp spectral lines are explained using the phonon–ion interaction theory which assumes the Debye model for phonons in crystalline solids.

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Temperature-Dependent Linewidth of Excited States in Crystals. I. Line Broadening due to Adiabatic Variation of the Local Fields

Cited by 49 publications

References 3 publications

Raman tensor analysis of sapphire single crystal and its application to define crystallographic orientation in polycrystalline alumina

Raman tensor analysis of sapphire single crystal and its application to define crystallographic orientation in polycrystalline alumina

Cr3+Fluorescence in Garnets and Other Crystals

Inter-Stark Energy Levels and Effects of Temperature on Sharp Emission Lines of Nd3+ in LiYF4

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