scholarly journals Измерения зеемановско-сверхтонкого псевдовырожденного квадруплета в CaF-=SUB=-2-=/SUB=-:Ho-=SUP=-3+-=/SUP=-

2022 ◽  
Vol 130 (1) ◽  
pp. 33
Author(s):  
Kieran M. Smith ◽  
Michael F. Reid ◽  
Jon-Paul R. Wells
Keyword(s):  
Crystal Field ◽  
Predictive Ability ◽  
Information Storage ◽  
Field Analysis ◽  
Field Approach ◽  
Infra Red ◽  
Hyperfine Splittings ◽  
Nuclear Levels ◽  
Rare Earth Doped ◽  
The Magnetic Field

We report Zeeman infra-red spectroscopy of electronic-nuclear levels of 5I8 →5I7 transitions of Ho3+ in the C4v(F−) centre in CaF2 with the magnetic field along the ⟨111⟩ direction of the crystal. Transitions to the lowest 5I7 state, an isolated electronic doublet, and the next group of states, a pseudo-quadruplet consisting of a doublet and two nearby singlets, exhibit strongly non-linear Zeeman splittings and intensity variations. Simulated spectra based upon a crystal-field analysis give an excellent approximation to the data, illustrating the strong predictive ability of the parametrised crystal-field approach. Anti-crossings in the hyperfine splittings, the basis of quantum information storage in rare-earth doped insulating dielectrics, are also predicted.

Materials for Electron Beam Information Storage

1969 ◽  
Vol 27 ◽  
pp. 152-153 ◽  
Author(s):  
D. E. Speliotis
Keyword(s):  
Magnetic Field ◽  
Electron Beam ◽  
Recent Literature ◽  
Electron Beams ◽  
Information Storage ◽  
The Subject ◽  
The Magnetic Field

The interaction of electron beams with a large variety of materials for information storage has been the subject of numerous proposals and studies in the recent literature. The materials range from photographic to thermoplastic and magnetic, and the interactions with the electron beam for writing and reading the information utilize the energy, or the current, or even the magnetic field associated with the electron beam.

3D-QSAR Studies of S-DABO Derivatives as Non-nucleoside HIV-1 Reverse Transcriptase Inhibitors

2019 ◽  
Vol 16 (8) ◽  
pp. 868-881
Author(s):  
Yueping Wang ◽  
Jie Chang ◽  
Jiangyuan Wang ◽  
Peng Zhong ◽  
Yufang Zhang ◽  
...  
Keyword(s):  
Reverse Transcriptase ◽  
Three Dimensional ◽  
Predictive Ability ◽  
3D Qsar ◽  
Binding Mode ◽  
Quantitative Structure Activity Relationship ◽  
Field Analysis ◽  
Reverse Transcriptase Inhibitors ◽  
Qsar Studies ◽  
Hiv 1

Background: S-dihydro-alkyloxy-benzyl-oxopyrimidines (S-DABOs) as non-nucleoside reverse transcriptase inhibitors have received considerable attention during the last decade due to their high potency against HIV-1. Methods: In this study, three-dimensional quantitative structure-activity relationship (3D-QSAR) of a series of 38 S-DABO analogues developed in our lab was studied using Comparative Molecular Field Analysis (CoMFA) and Comparative Molecular Similarity Indices Analysis (CoMSIA). The Docking/MMFF94s computational protocol based on the co-crystallized complex (PDB ID: 1RT2) was used to determine the most probable binding mode and to obtain reliable conformations for molecular alignment. Statistically significant CoMFA (q2=0.766 and r2=0.949) and CoMSIA (q2=0.827 and r2=0.974) models were generated using the training set of 30 compounds on the basis of hybrid docking-based and ligand-based alignment. Results: The predictive ability of CoMFA and CoMSIA models was further validated using a test set of eight compounds with predictive r2 pred values of 0.843 and 0.723, respectively. Conclusion: The information obtained from the 3D contour maps can be used in designing new SDABO derivatives with improved HIV-1 inhibitory activity.

Spectroscopic studies and crystal-field analysis of U3+ ions in RbY2Cl7 single crystals

1997 ◽  
Vol 106 (8) ◽  
pp. 3067-3077 ◽  
Author(s):  
M. Karbowiak ◽  
J. Drozdzynski ◽  
K. M. Murdoch ◽  
N. M. Edelstein ◽  
S. Hubert
Keyword(s):  
Single Crystals ◽  
Crystal Field ◽  
Spectroscopic Studies ◽  
Field Analysis

Spectroscopy and crystal-field analysis of KY3F10:Ho3+

2009 ◽  
Vol 21 (25) ◽  
pp. 255402 ◽  
Author(s):  
Marjorie Mujaji ◽  
Jon-Paul R Wells
Keyword(s):  
Crystal Field ◽  
Field Analysis

scholarly journals The pH Value Control of Morphology and Luminescence Properties of Gd2O2S: Tb3+ Phosphors

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 646
Author(s):  
Peng Jiang ◽  
Zhipeng Li ◽  
Wei Lu ◽  
Yi Ma ◽  
Wenhuai Tian
Keyword(s):  
Electron Beam ◽  
Rare Earth ◽  
Ph Value ◽  
Uv Light ◽  
Hexagonal Phase ◽  
Band Gap Energy ◽  
Information Storage ◽  
Luminescence Properties ◽  
Research Fields ◽  
Rare Earth Doped

Developing rare-earth doped oxysulfide phosphors with diverse morphologies has significant value in many research fields such as in displays, medical diagnosis, and information storage. All of the time, phosphors with spherical morphology have been developed in most of the related literatures. Herein, by simply adjusting the pH values of the reaction solution, Gd2O2S:Tb3+ phosphors with various morphologies (sphere-like, sheet-like, cuboid-like, flat square-like, rod-like) were synthesized. The XRD patterns showed that phosphors with all morphologies are pure hexagonal phase of Gd2O2S. The atomic resolution structural analysis by transmission electron microscopy revealed the crystal growth model of the phosphors with different morphology. With the morphological change, the band gap energy of Gd2O2S:Tb3+ crystal changed from 3.76 eV to 4.28 eV, followed by different luminescence performance. The samples with sphere-like and cuboid-like microstructures exhibit stronger cathodoluminescence intensity than commercial product by comparison. Moreover, luminescence of Gd2O2S:Tb3+ phosphors have different emission performance excited by UV light radiation and an electron beam, which when excited by UV light is biased towards yellow, and while excited by an electron beam is biased towards cyan. This finding provides a simple but effective method to achieve rare-earth doped oxysulfide phosphors with diversified and tunable luminescence properties through morphology control.

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