Line Shape of the A Band of s2 Configuration Ions in Alkali Halide Crystals

1975 ◽  
Vol 53 (2) ◽  
pp. 192-199 ◽  
Author(s):  
Taiju Tsuboi ◽  
K. Oyama ◽  
P. W. M. Jacobs
Keyword(s):  
Fine Structure ◽  
Line Shape ◽  
Alkali Halide ◽  
Alkali Halides ◽  
Systematic Investigation ◽  
Temperature Sensitive ◽  
Doublet Structure ◽  
Jahn Teller ◽  
Jahn Teller Effect ◽  
Alkali Halide Crystals

A systematic investigation of the line shape of the A band of several ions with the s2 configuration dissolved in alkali halides has been made on KCl:In+, KBr:In+, KCl:Sn2+, KBr:Sn2+, KI:Sn2+, RbCl:Sn2+, KCl:Tl+, KBr:Tl+, KI:Tl+, and KBr:Pb2+ crystals. A temperature sensitive doublet structure was observed for In+ and Sn2+ doped crystals and for KCl:Tl+, while a single band, which is asymmetric at high temperatures, was observed for KBr:Tl+ and KBr:Pb2+. The temperature dependence of the line shape supports Toyozawa and Inoue's theory in which the fine structure is ascribed to the dynamical Jahn–Teller effect. A discussion is given of the importance of quadratic electron–lattice interaction and its effect on the asymmetry of the line shape.

Optical Absorption Spectra of the A Band in KBr:Pb2+ Crystals

1975 ◽  
Vol 53 (2) ◽  
pp. 200-201 ◽  
Author(s):  
Taiju Tsuboi ◽  
Robert E. Chaney ◽  
P. W. M. Jacobs
Keyword(s):  
Optical Absorption ◽  
Absorption Spectra ◽  
High Temperatures ◽  
Line Shape ◽  
Low Temperatures ◽  
Alkali Halides ◽  
Teller Effect ◽  
Optical Absorption Spectra ◽  
Jahn Teller ◽  
Jahn Teller Effect

The shape of the A band in KBr:Pb2+ has been studied at various temperatures between 13 and 296 K. The band is almost symmetric at low temperatures but slightly asymmetric at high temperatures. The observed line shape of the A band in KBr:Pb2+ is discussed in terms of the Jahn–Teller effect and is compared with that of the A band in In+ and Tl+ doped alkali halides.

Spectral Fine Structure, Local Structure and Jahn-Teller Effect of α-Al2O3Crystal Doped with Ni2+

2010 ◽  
Vol 39 (12) ◽  
pp. 2183-2189
Author(s):  
殷春浩 YIN Chun-hao ◽  
焦杨 JIAO Yang ◽  
神干 SHEN Gan ◽  
李富强 LI Fu-qiang ◽  
朱姗姗 ZHU Shan-shan
Keyword(s):  
Fine Structure ◽  
Local Structure ◽  
Teller Effect ◽  
Jahn Teller ◽  
Jahn Teller Effect

An Exponential Function for Repulsive Interaction Energy Term I. Application to Alkali Halides

1974 ◽  
Vol 29 (11) ◽  
pp. 1601-1607
Author(s):  
K. D. Misra ◽  
V. K. Dixit ◽  
M. N. Sharma
Keyword(s):  
Equation Of State ◽  
Alkali Halide ◽  
Alkali Halides ◽  
Good Choice ◽  
Repulsive Interaction ◽  
Energy Term ◽  
Energy Functions ◽  
Potential Energy Functions ◽  
Alkali Halide Crystals ◽  
Potential Parameters

The appropriateness of a suitably modified Varshni-Shukla potential has been tested for a series of alkali halide crystals by determining the numerical values of the potential parameters involved, using Hildebrand’s equation of state and thereby computing a few lattice properties. Comparison between the different sets of theoretical and experimental results infers that the present theoretical values exhibit an improvement over those of other workers, using a similar approach but with different potential energy functions. It is concluded that the modified V -S potential function is a good choice for explaining the behaviour of alkali halide lattices.

scholarly journals Optical Properties of Alkali Halides in Ultraviolet Spectral Regions

Optics ◽  
2019 ◽  
Vol 1 (1) ◽  
pp. 18-31 ◽  
Author(s):  
Khagendra P. Bhandari
Keyword(s):  
Alkali Halide ◽  
Optical Constants ◽  
Complex Function ◽  
Alkali Halides ◽  
Current Theory ◽  
Dielectric Constants ◽  
The Real ◽  
Band Transition ◽  
Alkali Halide Crystals ◽  
Kronig Relation

The optical reflectance spectra of alkali halide crystals KI and RbI were measured over the energy range of 4.14 to 6.91 eV. Both single crystal and poly-crystal samples were used to accomplish this task. The phase θ ( ω ) was computed using the Kramers-Kronig relation between the real and imaginary parts of the complex function, ln r = ln | r | + i θ ( ω ) . Subsequently, the optical constants n and κ were determined from the Fresnel reflectivity equation. The real and imaginary parts of dielectric constants ε 1 and ε 2 were then calculated using n and κ. The optical absorption spectra of the crystal have also been measured in these spectral regions. The spectra agree reasonably well with the current theory concerning exciton peaks. In addition, a shoulder was found in the spectra similar to those previously seen and associated with the band-to-band transition in the alkali iodides.

Relaxed excited states determined by Jahn-Teller effect in Ti+-type centers in alkali halides

1976 ◽  
Vol 12-13 ◽  
pp. 139-149 ◽  
Author(s):  
Atsuo Fukuda ◽  
Akira Matsushima ◽  
Shoji Masunaga
Keyword(s):  
Excited States ◽  
Alkali Halides ◽  
Teller Effect ◽  
Jahn Teller ◽  
Jahn Teller Effect

Reserach on Fine Structure of Ground-State Energy Levels and the Jahn-Teller Effect of Fe2P2S6Crystal

2014 ◽  
Vol 34 (5) ◽  
pp. 0526002
Author(s):  
殷春浩 Yin Chunhao ◽  
徐振坤 Xu Zhenkun ◽  
吴彩平 Wu Caiping ◽  
张雷 Zhang Lei ◽  
焦杨 Jiao Yang ◽  
...  
Keyword(s):  
Fine Structure ◽  
Ground State Energy ◽  
Ground State ◽  
State Energy ◽  
Energy Levels ◽  
Teller Effect ◽  
Jahn Teller ◽  
Jahn Teller Effect

Dynamical Jahn-Teller Effect in Alkali Halide Phosphors Containing Heavy Metal Ions

1966 ◽  
Vol 21 (9) ◽  
pp. 1663-1679 ◽  
Author(s):  
Yutaka Toyozawa ◽  
Masaharu Inoue
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Alkali Halide ◽  
Heavy Metal Ions ◽  
Teller Effect ◽  
Jahn Teller ◽  
Jahn Teller Effect

Line Shape of C Bands in Alkali Halide Phosphors by the Method of Moments

1972 ◽  
Vol 50 (12) ◽  
pp. 1370-1378 ◽  
Author(s):  
R. Sati ◽  
S. Wang ◽  
M. Inoue
Keyword(s):  
Method Of Moments ◽  
Line Shape ◽  
Alkali Halide ◽  
Adiabatic Approximation ◽  
Linear Electron ◽  
Line Shapes ◽  
Triplet Structure ◽  
Jahn Teller ◽  
Degenerate States ◽  
Franck Condon

We have derived the optical absorption line shape for C bands in alkali halide phosphors by the method of moments. The dynamic Jahn–Teller interaction is considered in the excited T1u electronic states. This interaction is taken to be linear in the lattice displacements. The obtained line shape exhibits asymmetric triplet structure even in the linear electron–lattice interaction. The use of the quasi-classical approach (i.e. the use of the adiabatic approximation and Franck–Condon principle) for electronic transition to orbitally degenerate states is discussed by comparing the line shapes obtained in this approach with those obtained by the method of moments.

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