scholarly journals Влияние ультрафиолетового света на люминесценцию (700-1000 nm) кристаллов LiF и LiF : ОН, облученных в ядерном реакторе

2022 ◽  
Vol 130 (3) ◽  
pp. 359
Author(s):  
В.Г. Квачадзе ◽  
М.Г. Абрамишвили ◽  
Г.Г. Абрамишвили ◽  
З.Г. Ахвледиани ◽  
М.В. Галусташвили ◽  
...  
Keyword(s):  
Ultraviolet Light ◽  
Mechanical Loading ◽  
High Stability ◽  
Room Temperature ◽  
Color Centers ◽  
Subsequent Exposure ◽  
Nm Range

The emission (700-1000 nm) and absorption (200-800 nm) spectra of LiF and LiF:OH crystals irradiated in a reactor and exposed to ultraviolet light, including those combined with mechanical loading, have been studied. The aim of this work is to study the behavior of laser color centers in these systems. In the 710–825 nm range, diametrically opposite results are observed: high stability of F4-like centers in “pure” LiF and their sharp destruction in LiF:OH crystals. At the same time, in both groups, F3 and F4 centers are destroyed and F2+ and F3- laser centers (825–925 nm) are intensely accumulated. Upon subsequent exposure at room temperature and darkness, spontaneous disintegration of laser centers is observed, accompanied by an increase of concentration of F4-like centers and restoration of the microstructure of irradiated crystals.

Ultraviolet Light-Densified Oxide-Organic Self-Assembled Dielectrics: Processing Thin-Film Transistors at Room Temperature

2021 ◽  
Vol 13 (2) ◽  
pp. 3445-3453
Author(s):  
Wei Huang ◽  
Xinge Yu ◽  
Li Zeng ◽  
Binghao Wang ◽  
Atsuro Takai ◽  
...  
Keyword(s):  
Thin Film ◽  
Ultraviolet Light ◽  
Thin Film Transistors ◽  
Room Temperature ◽  
Self Assembled

Tunable room temperature laser on color centers in KMgF3

1986 ◽  
Vol 57 (6) ◽  
pp. 400-402 ◽  
Author(s):  
A.P. Shkadarevich ◽  
M.A. Dubinskii ◽  
M.V. Nikanovich ◽  
N.I. Silkin ◽  
D.S. Umreiko ◽  
...  
Keyword(s):  
Room Temperature ◽  
Color Centers

ÉTUDE DE LA RÉACTION DE L'ADRÉNALINE AVEC L'ÉTHYLÈNEDIAMINE

1959 ◽  
Vol 37 (1) ◽  
pp. 231-244
Author(s):  
Guy Nadeau ◽  
Louis-Philippe Joly
Keyword(s):  
Hydrochloric Acid ◽  
Complex Formation ◽  
Beneficial Effect ◽  
Ultraviolet Light ◽  
Room Temperature ◽  
Aliphatic Alcohols ◽  
Fluorescent Material ◽  
Optimum Ph ◽  
Formation Efficiency ◽  
Influence Of Ph

The influence of pH, reagent composition, time, temperature, light, and various ions, on the reaction of fluorescence between adrenaline and ethylenediamine, has been investigated. The necessity of a preliminary oxidation to adrenochrome is confirmed. Optimum pH of reaction is situated at 10.4 ± 0.1, while extraction with isobutanol is best performed at pH 10.1 ± 0.1. A satisfactory reagent is one that contains 114.5 millimoles of ethylenediamine base per 100 ml of reacting mixture and sufficient hydrochloric acid to bring the pH to 10.3 ± 0.1. Temperature and length of reaction may be conveniently set at 50 °C and 20 to 30 minutes. Increasing the temperature significantly lowers the yield of fluorescent material; performing the reaction at room temperature increases the yield, but lengthens the procedure. Exposure to diffuse and ultraviolet light also affects the yield of fluorescence. All these factors (temperature, light, as well as excess of oxygen) appear to exert their influence in the first stages of the reaction, since the fluorescent material, once formed, is relatively stable. The beneficial effect of various ions, including Cu++, Al+++, and MoO4−−, is discussed in relation to complex formation. Efficiency of extraction with aliphatic alcohols has also been investigated; true yield from C14-adrenaline is estimated. In the light of recent findings on the structure of adrenochrome, new pathways for the reaction are suggested.

Comparative study of tunable room-temperature laser operation in the 900–1100-nm range: LiF:F_2^+ and Ti^3+:sapphire

2000 ◽  
Vol 39 (24) ◽  
pp. 4320 ◽  
Author(s):  
Chris B. Rawle ◽  
Iain T. McKinnie ◽  
Valerii V. Ter-Mikirtychev ◽  
Weston J. Sandle
Keyword(s):  
Comparative Study ◽  
Room Temperature ◽  
Laser Operation ◽  
Nm Range

Formation of Color Centers in KCl(Tl) after Linac Electron Pulse at Room Temperature

1972 ◽  
Vol 32 (4) ◽  
pp. 1152-1152 ◽  
Author(s):  
Ryoitiro Huzimura ◽  
Takeo Morishita ◽  
Makoto Noda
Keyword(s):  
Room Temperature ◽  
Color Centers ◽  
Electron Pulse

scholarly journals Controlled O2 reduction at a mixed-valent (II,I) Cu2S core

2020 ◽  
Vol 56 (67) ◽  
pp. 9636-9639 ◽  
Author(s):  
Jordan Mangue ◽  
Clément Gondre ◽  
Jacques Pécaut ◽  
Carole Duboc ◽  
Stéphane Ménage ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Copper Complex ◽  
High Stability ◽  
Room Temperature ◽  
Reduction Reactions ◽  
Oxygen Reduction Reactions ◽  
O2 Reduction

Oxygen reduction reactions catalyzed by a mixed-valent copper complex reveal a tuneable H2O2/H2O selectivity at room temperature together with high stability over several cycles.

Mechanically exfoliated MoS2 nanosheets decorated with SnS2 nanoparticles for high-stability gas sensors at room temperature

Rare Metals ◽  
2020 ◽  
Author(s):  
Jia-Bei Liu ◽  
Jin-Yong Hu ◽  
Can Liu ◽  
Yu-Ming Tan ◽  
Xiang Peng ◽  
...  
Keyword(s):  
Gas Sensors ◽  
High Stability ◽  
Room Temperature ◽  
Mos2 Nanosheets

A nitrogen doped carbonized metal–organic framework for high stability room temperature sodium–sulfur batteries

2016 ◽  
Vol 4 (32) ◽  
pp. 12471-12478 ◽  
Author(s):  
Yu-Ming Chen ◽  
Wenfeng Liang ◽  
Si Li ◽  
Feng Zou ◽  
Sarang M. Bhaway ◽  
...  
Keyword(s):  
High Stability ◽  
Room Temperature ◽  
Composite Electrode ◽  
Metal Organic Framework ◽  
Specific Capacity ◽  
Nitrogen Doped ◽  
Metal Organic ◽  
Sodium Sulfur ◽  
Organic Framework

A nitrogen-doped carbonized metal–organic framework was utilized for room temperature sodium sulfur batteries. The cZIF-8/S composite electrode exhibited good cyclability over 250 cycles at 0.2C with a specific capacity of 500 mA h g−1.

Sign in / Sign up

Export Citation Format

Share Document