Radiation Damage Products in Ionic Crystals Impurity Doped Alkali Halides

Radhakrishna, S.; Chowdari, B. V. R.

doi:10.1002/prop.19770250115

Cited by 24 publications

(5 citation statements)

References 203 publications

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“…According to this interpretation the thermal vibrations of the crystal lattice induce a non-cubic crystal field at the Cd' ion, which mixes the 5p excited states into the ground 5s electronic state. The normalization of the new, mixed electron wave function results in a reduction of the 5s electron density at the Cd nucleus, and according to (17), of the hf constant A. Neglecting the contribution from the dipolar interaction term, the temperature (50) can be approximated by (49).…”

Section: The Iib Group (Zn' Cd+ H G + )mentioning

confidence: 99%

Spectroscopy of the ns¹‐Centers in Ionic Crystals

Nistor

Schoemaker

Ursu

1994

Physica Status Solidi (b)

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Section: The Iib Group (Zn' Cd+ H G + )mentioning

confidence: 99%

Spectroscopy of the ns¹‐Centers in Ionic Crystals

Nistor

Schoemaker

Ursu

1994

Physica Status Solidi (b)

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“…They are the V,, NH,Cl, and N$,i centres. The Vk-centre in ammonium halides is analogous to the Vk-centre in alkali halides [7]. The other two centres, NH,C1 and N,H,+, have no parallels in alkali halides.…”

Section: Earlier Workmentioning

confidence: 96%

Radiation Damage Studies of Co²⁺ and Ni²⁺ Doped NH₄Cl Crystals

Rambau

Ramasastry

Chowdari

1983

Physica Status Solidi (b)

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Results from the radiation damage studies of KH,CI :Co2+ and NH,CI :NiZ + crystals are presented.On X-irradiation a t room temperature the NH,C1:Co2+ crystals are found to absorb a t 270, 345, 585, 900, and 1000 nm. These absorption bands are attributed to the charge transfer transitions between radiation induced hydrazine-like defect, N,HZ, and ligands H,O or NH, which are made available in the crystal along with the divalent impurity. If not all the absorption bands but similar absorption is found on irradiation in Ni2+ doped NH,CI crystals also. ESR studies of X-rayed Ni2+ doped NH,CI crystals reveal the formation of both, Ni+ and Ni"'. Spin-Hamiltonian parameters for these centers are given. Es werden die Ergebnisse von Strahlungsdamageuntersuchungen von NH,CI :Co2+ und NH,CI:Ni2+ Kristallen mitgeteilt. Nach Rontgenbestrahlung bei Zimmertemperatur absorbieren NH,C1 :Co2+-Kristalle bei 270, 345, 585, 900 und 1000 nm. Diese Absorptionsbanden werden Ladungstransferubergangen zwischen einem strahlungsinduzierten hydrazinahnlichen Defekt, N2H, und H,O-oder NH,-Liganden zugeordnet, die zusammen mit der divalenten Storstelle im Kristall gebildet werden. Eine ahnliche Absorption, wenn auch niclit alle Absorptionsbanden, werden nach Bestrahlung in Xi2+ dotierten NH,CI-Kristallen ebenfalls gefunden. ESR-Untersuchungen an rontgenbestrahlten Nil+-dotierten NH,CI-Kristallen zeigen die Bildung sow~ohl von Ni' als auch Xi3+. Die Spin-Hamiltonoperstoren fur diese Zentren w-erden angegeben.

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“…Local Vibrational Modes (cm −1 ) F 1.97 [2], 2.0 [3] 110, 121 [3]; 175 [4] H 3.2 [2] 182, 209 [5] V K 3.2 [2] 144 [5] V 2 (Br − 3 ) 4.7 [2], 4.5 [6], 4.6 [19] 175 [4,6] We would like to note that the problems considered in this work are especially important in the following cases. The first is when there are several overlapping optical absorption bands, making the accurate identification of point defects difficult.…”

Section: Defect Optical Absorption (Ev)mentioning

confidence: 99%

“…KBr crystals are used as carriers for samples in IR measurements [1] and as models in studies of radiation-induced processes [2][3][4][5][6]. Moreover, when KBr is doped with various impurities, it exhibits excellent radiation storage properties and has, therefore, been proposed as an X-ray and UV photostimulable storage phosphor [7], a thermoluminescent dosimeter [8], or a neutron storage phosphor [9].…”

Section: Introductionmentioning

confidence: 99%

Ab Initio Study on the Vibrational and Electronic Properties of Radiation-Induced Defects in Potassium Bromide

Platonenko,

Pankratov,

Kotomin

et al. 2024

Crystals

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The vibrational and electronic properties of several basic radiation defects in potassium bromide are computed at the quantum mechanical level using a periodic supercell approach based on hybrid functionals, an all-electron Gaussian-type basis set, and the Crystalcomputer code. The exciton energy in alkali halides is sufficient to create lattice defects, such as F–H Frenkel defect pairs, resulting in a relatively high concentration of single defects and their complexes. Here, we consider eight defects: the electronic F+- and F-centers (bromine vacancy without and with trapped electrons) and their dimers; hole H-center (neutral bromine atom forming the dumbbell ion with a regular Br− ion.); VK-center (Br2− molecular ion consisting of a hole and two regular ions); and two complex Br3− defects, combinations of several simple defects. The local geometry and the charge- and spin-density distributions of all defects are analyzed. Every defect shows its characteristic features in Raman spectra, and their comparison with available experimental data is discussed.

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Radiation Damage Products in Ionic Crystals Impurity Doped Alkali Halides

Cited by 24 publications

References 203 publications

Spectroscopy of the ns¹‐Centers in Ionic Crystals

Spectroscopy of the ns¹‐Centers in Ionic Crystals

Radiation Damage Studies of Co²⁺ and Ni²⁺ Doped NH₄Cl Crystals

Ab Initio Study on the Vibrational and Electronic Properties of Radiation-Induced Defects in Potassium Bromide

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Radiation Damage Products in Ionic Crystals Impurity Doped Alkali Halides

Cited by 24 publications

References 203 publications

Spectroscopy of the ns1‐Centers in Ionic Crystals

Spectroscopy of the ns1‐Centers in Ionic Crystals

Radiation Damage Studies of Co2+ and Ni2+ Doped NH4Cl Crystals

Ab Initio Study on the Vibrational and Electronic Properties of Radiation-Induced Defects in Potassium Bromide

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Spectroscopy of the ns¹‐Centers in Ionic Crystals

Spectroscopy of the ns¹‐Centers in Ionic Crystals

Radiation Damage Studies of Co²⁺ and Ni²⁺ Doped NH₄Cl Crystals