Uniaxial Stress Effects on Parity‐forbidden Transitions in NaCl:Cu<sup>+</sup> and KCl:Ag<sup>+</sup>

Dultz, W.

doi:10.1002/pssb.19690340109

Cited by 18 publications

(1 citation statement)

References 10 publications

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“…In the past this structure was assigned to sixfoldcoordinated Cu ϩ ions. 9,25,26 The peak position does not change with temperature. The ionic peak is accompanied by a background that increases strongly with ប.…”

Section: B the Onset Of Band-gap Absorptionmentioning

confidence: 92%

Nanocrystal growth in alkali halides observed by exciton spectroscopy

Haselhoff

Weber

1998

Phys. Rev. B

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We have developed a method to study the growth of CuCl and CuBr nanocrystals in alkali halides by in situ absorption spectroscopy. Exciton lines are used as a signature of crystallinity and a broad absorption peak measures the number of Cu ϩ ions. The mean radius R and the concentration x cr of nanocrystals are determined simultaneously, which in turn enables the determination of the particle density N of crystals as a function of time. Neither the size-distribution function nor R(t) follow the prediction of the classical growth theory. x cr (t) reveals two different growth mechanisms, one for high and one for low growth temperatures. N(t) demonstrates that the growth of big crystals at the expense of small crystals happens from the beginning of the growth process. This result contradicts the traditional view of Ostwald ripening as a final stage of precipitation and stresses the dynamical character of cluster growth. The experimental data are described by a set of empirical parameters that can be used as a guide for controlled growth of CuCl nanocrystals in NaCl. The smallest nanocrystals detected by exciton spectroscopy consist of 50 unit cells. The kinetic properties of KCl and NaBr crystals doped with CuCl and CuBr are very similar to those observed in NaCl doped with CuCl.

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Section: B the Onset Of Band-gap Absorptionmentioning

confidence: 92%

Nanocrystal growth in alkali halides observed by exciton spectroscopy

Haselhoff

Weber

1998

Phys. Rev. B

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On the UV Absorption of Heavy Metal Ions in Alkali Halide Crystals II. Interpretation of the Temperature Dependences of the UV Dipole Strength

Fussgaenger

1969

Physica Status Solidi (b)

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The different temperature dependences of the UV dipole strength of forbidden electronic Ag+, CU+, and T1+ transitions in alkali halide crystals are interpreted by electron-phonon interaction, anharmonicity of phonons, off-centre effects, and thermal relaxations of the centres.Die verschiedenen Temperaturabhangigkeiten der UV-Dipolstarke von verbotenen, elektronischen Ag+-, Cu+-und Tl+-Ubergangen in Alkalihalogenid-Kristallen werden durch Elektron-Phonon-Wechselwirkung, Anharmonizitat der Phononen, ,,Off-centre"-Effekte und thermische Relaxationen der Storzentren gedeutet.

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Stark Effect of Impurity Centres by the Method of Average Moments

Gardavský

1972

Physica Status Solidi (b)

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The average moments and their changes are calculated independently of the perturbation theory. New electron optical transitions are due to the mixing of degenerate electron states from different energy levels by the Hamiltonian of an externally applied electric field. The average shift of the optical absorption bands is expressed in terms of the linear Stark effect energy changes. The even parity equivalent electric field, employed in the calculation of the change of the average second moment, may lead to a linear Stark effect of electron states with definite parity.Die mittleren Momente und ihre Anderungen wurden iinabhingig von der Storungstheorie berechnet. Neue wptische Elektronenubergange werden durch die Mischung der entarteten Elektronenzustande verschiedener Energieniveaus durch den Hamiltonoperator des iiuBeren elektrischen Feldes bedingt. Die mittlere Verschiebung der optischen Absorptionsbanden werden mit den EnegieSnderungen des linearen Starkeffekts ausgedriickt.Das ayuivalente elektrische Feld gerader Paritat, das bei der Berechnung der Anderung des mittleren zweiten Moments sngewandt wurde, kann zu einem linearen Starkeffekt der Elektronenzustande mit definierter Paritat fiihren. l) Present address: Humboldt-Universitit zu Berlin, Sektion Phpik, Bereich Halbleiteroptik. 32.

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Uniaxial Stress Effects on Parity‐forbidden Transitions in NaCl:Cu⁺ and KCl:Ag⁺

Cited by 18 publications

References 10 publications

Nanocrystal growth in alkali halides observed by exciton spectroscopy

Nanocrystal growth in alkali halides observed by exciton spectroscopy

On the UV Absorption of Heavy Metal Ions in Alkali Halide Crystals II. Interpretation of the Temperature Dependences of the UV Dipole Strength

Stark Effect of Impurity Centres by the Method of Average Moments

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Uniaxial Stress Effects on Parity‐forbidden Transitions in NaCl:Cu+ and KCl:Ag+

Cited by 18 publications

References 10 publications

Nanocrystal growth in alkali halides observed by exciton spectroscopy

Nanocrystal growth in alkali halides observed by exciton spectroscopy

On the UV Absorption of Heavy Metal Ions in Alkali Halide Crystals II. Interpretation of the Temperature Dependences of the UV Dipole Strength

Stark Effect of Impurity Centres by the Method of Average Moments

Contact Info

Product

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Uniaxial Stress Effects on Parity‐forbidden Transitions in NaCl:Cu⁺ and KCl:Ag⁺