The Experts below are selected from a list of 204 Experts worldwide ranked by ideXlab platform
Takeshi Hirai - One of the best experts on this subject based on the ideXlab platform.
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Luminescence properties of KCl:Ag− crystals excited near the Fundamental Absorption edge
Journal of Luminescence, 2012Co-Authors: Taketoshi Kawai, Takeshi HiraiAbstract:Abstract Luminescence properties of KCl single crystals doped with Ag− centers have been investigated under various excitation energies around the Fundamental Absorption edge at low temperatures. Under the excitation at 6.89 eV, which is lower than the intrinsic exciton energy by 0.87 eV, the A ′ luminescence band due to the intraionic transition in the Ag− ion is dominantly observed at 2.91 eV. On the other hand, the excitation at 6.66 eV induces a broad luminescence band at 2.60 eV in addition to the A ′ luminescence band. From the comparison with the localized excitons in KCl:I crystals, the 2.60 eV luminescence band is attributed to the two-center type localized exciton related with the Ag− ion. The adiabatic potential energy surfaces of the excited states in the Ag− center and the localized exciton in KCl:Ag− are discussed.
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luminescence properties of kcl ag crystals excited near the Fundamental Absorption edge
Journal of Luminescence, 2012Co-Authors: Taketoshi Kawai, Takeshi HiraiAbstract:Abstract Luminescence properties of KCl single crystals doped with Ag− centers have been investigated under various excitation energies around the Fundamental Absorption edge at low temperatures. Under the excitation at 6.89 eV, which is lower than the intrinsic exciton energy by 0.87 eV, the A ′ luminescence band due to the intraionic transition in the Ag− ion is dominantly observed at 2.91 eV. On the other hand, the excitation at 6.66 eV induces a broad luminescence band at 2.60 eV in addition to the A ′ luminescence band. From the comparison with the localized excitons in KCl:I crystals, the 2.60 eV luminescence band is attributed to the two-center type localized exciton related with the Ag− ion. The adiabatic potential energy surfaces of the excited states in the Ag− center and the localized exciton in KCl:Ag− are discussed.
V. V. Sobolev - One of the best experts on this subject based on the ideXlab platform.
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Chapter 5 – Optical Spectra of Arsenic Chalcogenides in a Wide Energy Range of Fundamental Absorption
Semiconductors and Semimetals, 2004Co-Authors: Val V Sobolev, V. V. SobolevAbstract:This chapter presents new information on the spectra of complete sets of the Fundamental optical functions of arsenic chalcogenide glasses in the range 0–35 eV, concerning their most intensive transitions and the main parameters of these transitions. Complete sets of the spectra of the Fundamental optical functions of three glassy arsenic chalcogenides As 2 S 3 , As 2 Se 3 , As 2 Te 3 , and two phases of As x Se 1-x system in a wide energy range of intrinsic Absorption are obtained. Their integral dielectric functions and characteristic bulk loss spectra are decomposed into the elementary transverse and longitudinal components. The main parameters of components are determined, including the transitions energies and probabilities. The schemes of interpretation of the components are proposed in the model of transitions occurring from the maximum densities of the occupied states to the unoccupied states. The obtained results substantially enlarge the amount of information about the optical spectra and electronic structure of As 2 X 3 glasses in a wide energy range of Fundamental Absorption. In addition, they lay a new principal foundation for the consideration of g-As 2 X 3 properties, and provide a basis for future theoretical calculations of their electronic structure and optical spectra.
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chapter 5 optical spectra of arsenic chalcogenides in a wide energy range of Fundamental Absorption
Semiconductors and Semimetals, 2004Co-Authors: Val V Sobolev, V. V. SobolevAbstract:This chapter presents new information on the spectra of complete sets of the Fundamental optical functions of arsenic chalcogenide glasses in the range 0–35 eV, concerning their most intensive transitions and the main parameters of these transitions. Complete sets of the spectra of the Fundamental optical functions of three glassy arsenic chalcogenides As 2 S 3 , As 2 Se 3 , As 2 Te 3 , and two phases of As x Se 1-x system in a wide energy range of intrinsic Absorption are obtained. Their integral dielectric functions and characteristic bulk loss spectra are decomposed into the elementary transverse and longitudinal components. The main parameters of components are determined, including the transitions energies and probabilities. The schemes of interpretation of the components are proposed in the model of transitions occurring from the maximum densities of the occupied states to the unoccupied states. The obtained results substantially enlarge the amount of information about the optical spectra and electronic structure of As 2 X 3 glasses in a wide energy range of Fundamental Absorption. In addition, they lay a new principal foundation for the consideration of g-As 2 X 3 properties, and provide a basis for future theoretical calculations of their electronic structure and optical spectra.
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Problems of the electronic structure of nonmetals in a wide energy region of Fundamental Absorption (review)
Journal of Applied Spectroscopy, 1999Co-Authors: V. V. SobolevAbstract:The article surveys the main unsolved problems of the electronic structure of nonmetals in a wide energy region of Fundamental Absorption.
A P Kouzov - One of the best experts on this subject based on the ideXlab platform.
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concentration studies of collision induced Fundamental Absorption of hydrogen dissolved in liquid neon
Journal of Chemical Physics, 2012Co-Authors: Wouter A Herrebout, B J Van Der Veken, A P KouzovAbstract:We report further and more detailed results of our recent investigation [W. A. Herrebout, B. J. van der Veken, and A. P. Kouzov, Phys. Rev. Lett. 101, 093001 (2008)]10.1103/PhysRevLett.101.093001 on the collision-induced Fundamental Absorption by hydrogen dissolved in liquid neon (T ≈ 25 K). The band shapes were studied in a wide range of concentrations (0.003–0.05 mole fractions) as well as for different ortho/para ratios and at much higher level of accuracy and resolution than before. Due to almost unhindered rotation of the hydrogen molecule and low temperature, an unprecedently rich frequency-domain picture produced by different terms of the interaction-induced polarization was observed. While some of them are conspicuous via fast intracell motion of a light guest (H2), others—induced by the electrostatic field of the guest—give rise to lines whose shapes are imprinted by fluctuations of the nearest surrounding. Strong motional narrowing observed on the guest-guest induced lines shows up in their Lore...
Taketoshi Kawai - One of the best experts on this subject based on the ideXlab platform.
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Luminescence properties of KCl:Ag− crystals excited near the Fundamental Absorption edge
Journal of Luminescence, 2012Co-Authors: Taketoshi Kawai, Takeshi HiraiAbstract:Abstract Luminescence properties of KCl single crystals doped with Ag− centers have been investigated under various excitation energies around the Fundamental Absorption edge at low temperatures. Under the excitation at 6.89 eV, which is lower than the intrinsic exciton energy by 0.87 eV, the A ′ luminescence band due to the intraionic transition in the Ag− ion is dominantly observed at 2.91 eV. On the other hand, the excitation at 6.66 eV induces a broad luminescence band at 2.60 eV in addition to the A ′ luminescence band. From the comparison with the localized excitons in KCl:I crystals, the 2.60 eV luminescence band is attributed to the two-center type localized exciton related with the Ag− ion. The adiabatic potential energy surfaces of the excited states in the Ag− center and the localized exciton in KCl:Ag− are discussed.
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luminescence properties of kcl ag crystals excited near the Fundamental Absorption edge
Journal of Luminescence, 2012Co-Authors: Taketoshi Kawai, Takeshi HiraiAbstract:Abstract Luminescence properties of KCl single crystals doped with Ag− centers have been investigated under various excitation energies around the Fundamental Absorption edge at low temperatures. Under the excitation at 6.89 eV, which is lower than the intrinsic exciton energy by 0.87 eV, the A ′ luminescence band due to the intraionic transition in the Ag− ion is dominantly observed at 2.91 eV. On the other hand, the excitation at 6.66 eV induces a broad luminescence band at 2.60 eV in addition to the A ′ luminescence band. From the comparison with the localized excitons in KCl:I crystals, the 2.60 eV luminescence band is attributed to the two-center type localized exciton related with the Ag− ion. The adiabatic potential energy surfaces of the excited states in the Ag− center and the localized exciton in KCl:Ag− are discussed.
Wouter A Herrebout - One of the best experts on this subject based on the ideXlab platform.
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concentration studies of collision induced Fundamental Absorption of hydrogen dissolved in liquid neon
Journal of Chemical Physics, 2012Co-Authors: Wouter A Herrebout, B J Van Der Veken, A P KouzovAbstract:We report further and more detailed results of our recent investigation [W. A. Herrebout, B. J. van der Veken, and A. P. Kouzov, Phys. Rev. Lett. 101, 093001 (2008)]10.1103/PhysRevLett.101.093001 on the collision-induced Fundamental Absorption by hydrogen dissolved in liquid neon (T ≈ 25 K). The band shapes were studied in a wide range of concentrations (0.003–0.05 mole fractions) as well as for different ortho/para ratios and at much higher level of accuracy and resolution than before. Due to almost unhindered rotation of the hydrogen molecule and low temperature, an unprecedently rich frequency-domain picture produced by different terms of the interaction-induced polarization was observed. While some of them are conspicuous via fast intracell motion of a light guest (H2), others—induced by the electrostatic field of the guest—give rise to lines whose shapes are imprinted by fluctuations of the nearest surrounding. Strong motional narrowing observed on the guest-guest induced lines shows up in their Lore...
