Optical property in colorless AlN bulk crystals: investigation of native defect-induced UV absorption

2021 ◽  
Vol 190 ◽  
pp. 91-96
Author(s):  
Lei Jin ◽  
Kun Zhao ◽  
Shihai Xu ◽  
Zuoyan Qin ◽  
Hongjuan Cheng ◽  
...  
Keyword(s):  
Optical Property ◽  
Uv Absorption ◽  
Native Defect ◽  
Bulk Crystals

Lattice imaging and pore structure of β ferric oxyhydroxide

1978 ◽  
Vol 36 (1) ◽  
pp. 264-265
Author(s):  
T. Baird ◽  
J.R. Fryer ◽  
S.T. Galbraith
Keyword(s):  
Electron Microscopy ◽  
Room Temperature ◽  
Bulk Material ◽  
Model Structure ◽  
Bulk Crystals ◽  
Lattice Imaging ◽  
Thin Sections ◽  
Ferric Oxyhydroxide ◽  
Resolution Electron ◽  
Hydrolysis Of

Introduction Previously we had suggested (l) that the striations observed in the pod shaped crystals of β FeOOH were an artefact of imaging in the electron microscope. Contrary to this adsorption measurements on bulk material had indicated the presence of some porosity and Gallagher (2) had proposed a model structure - based on the hollandite structure - showing the hollandite rods forming the sides of 30Å pores running the length of the crystal. Low resolution electron microscopy by Watson (3) on sectioned crystals embedded in methylmethacrylate had tended to support the existence of such pores.We have applied modern high resolution techniques to the bulk crystals and thin sections of them without confirming these earlier postulatesExperimental β FeOOH was prepared by room temperature hydrolysis of 0.01M solutions of FeCl3.6H2O, The precipitate was washed, dried in air, and embedded in Scandiplast resin. The sections were out on an LKB III Ultramicrotome to a thickness of about 500Å.

UV Absorption and Photoisomerization of p-Methoxycinnamate Grafted Silicone

2004 ◽  
Author(s):  
Supason Pattanaargson ◽  
Nantawan Hongchinnagorn ◽  
Piyawan Hirunsupachot ◽  
Yongsak Sritana-anant
Keyword(s):  
Uv Absorption

Analysis and optical property modeling of LDEF contaminated chromic acid anodized surfaces

2000 ◽  
Author(s):  
S. Woll ◽  
V. Loebs ◽  
C. Phelps ◽  
H. Pippin ◽  
D. Grandall ◽  
...  
Keyword(s):  
Optical Property ◽  
Chromic Acid ◽  
Property Modeling

Variational Method for Estimating the Dipole Moment in the Second Excited State of Fluorescein Molecule from its Electronic UV Absorption Spectra

2019 ◽  
Vol 70 (10) ◽  
pp. 3538-3544
Author(s):  
Alina Costina Luca ◽  
Ana Cezarina Morosanu ◽  
Irina Macovei ◽  
Dan Gheorghe Dimitriu ◽  
Dana Ortansa Dorohoi ◽  
...  
Keyword(s):  
Dipole Moment ◽  
Excited State ◽  
Variational Method ◽  
Electronic State ◽  
Excited Electronic State ◽  
Spectral Band ◽  
Uv Absorption ◽  
Optical Parameters ◽  
Electrical Permittivity ◽  
Fluorescein Molecule

Electro-optical parameters of fluorescein molecule in the second excited electronic state and information on the interactions with solvents were obtained from a solvatochromic study. Parameters of the solvents such as the refractive index, electrical permittivity and Kamlet-Taft parameters (hydrogen bond acidity and basicity) were related with the experimentally recorded shifts of UV absorption spectral band of fluorescein dissolved in several solvents. Through a variational method, the electric dipole moment and polarizability in excited state of fluorescein molecule were estimated. The calculus requires some parameters of the fluorescein molecule in the ground electronic state, which were determined through a quantum-mechanical study.

Relation of Heat Transfer with the Growth Rate of InSb based Bulk Crystals Grown by VDS and its Effect on the Crystal Quality

2020 ◽  
Vol 12 (2) ◽  
pp. 02012-1-02012-5
Author(s):  
Dilip Maske ◽  
◽  
Manisha Deshpande ◽  
Dattatray Gadkari ◽  
◽  
...  
Keyword(s):  
Heat Transfer ◽  
Growth Rate ◽  
Crystal Quality ◽  
Bulk Crystals

Development of a monitor to simultaneously measure dissolved ozone and organic matter in ozonated water

1998 ◽  
Vol 37 (12) ◽  
pp. 285-292 ◽  
Author(s):  
Hiroshi Tsugura ◽  
Tetufumi Watanabe ◽  
Hiroshi Shimazaki ◽  
Shoichi Sameshima
Keyword(s):  
Organic Matter ◽  
Control System ◽  
Sodium Thiosulfate ◽  
Experimental Results ◽  
Uv Absorption ◽  
Uv Absorbance ◽  
Absorption Method ◽  
Ozonated Water

A method for measuring both dissolved ozone (DO3) concentration and UV absorbance was developed adopting ultraviolet (UV) absorption method (JWWA, 1993) using sodium thiosulfate (Na2S2O3) solution for removing residual ozone in ozonated water. A DO3 monitor based on this method was tested. This method was proven to be effective from experimental results. The performance of the monitor was examined with continuous ozonated water. As a result, the monitor performed stably during about 2 months, so that both DO3 concentration and UV absorbance in the ozonated water could be accurately measured. Therefore, the authors have proposed the new aquatic control system with this monitor for ozonation.

Effect of melting atmospheres on the optical property of radiation-hard fluorophosphate glass

2021 ◽  
Author(s):  
Yuan Ma ◽  
Haiqin Su ◽  
Zhijun Zhang ◽  
Rui Wan ◽  
Shengwu Li ◽  
...  
Keyword(s):  
Optical Property ◽  
Fluorophosphate Glass ◽  
Radiation Hard

Bilayer number driven changes in polarizability and optical property in ZnO/TiO2 nanocomposite films prepared by ALD

Optik ◽  
2021 ◽  
pp. 166617
Author(s):  
S.S. Fouad ◽  
B. Parditka ◽  
M. Nabil ◽  
E. Baradács ◽  
S. Negm ◽  
...  
Keyword(s):  
Optical Property ◽  
Nanocomposite Films

Simulation of UV Absorption Spectra and Relaxation Dynamics of Uracil and Uracil-Water Clusters

2020 ◽  
Author(s):  
Branislav Milovanović ◽  
Jurica Novak ◽  
Mihajlo Etinski ◽  
Wolfgang Domcke ◽  
Nadja Doslic
Keyword(s):  
Aqueous Solution ◽  
Gas Phase ◽  
Absorption Spectra ◽  
Absorption Spectroscopy ◽  
Water Clusters ◽  
Uv Absorption ◽  
Relaxation Dynamics ◽  
Nonradiative Relaxation ◽  
Uv Absorption Spectra ◽  
Uv Absorption Spectroscopy

Despite many studies, the mechanisms of nonradiative relaxation of uracil in the gas phase and in aqueous solution are still not fully resolved. Here we combine theoretical UV absorption spectroscopy...

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