Some interesting observations on the optical absorption spectra, thermoluminescence spectra and order of kinetics of lithium fluoride

1985 ◽  
Vol 10 (1-2) ◽  
pp. 61-69 ◽  
Author(s):  
S.P. Kathuria ◽  
S.V. Moharil ◽  
C.M. Sunta
Keyword(s):  
Optical Absorption ◽  
Absorption Spectra ◽  
Lithium Fluoride ◽  
Optical Absorption Spectra ◽  
Order Of Kinetics ◽  
Kinetics Of

Notizen: Pulse Radiolysis of Selenium Containing Compounds: Selenomethionine

1974 ◽  
Vol 29 (7-8) ◽  
pp. 571-572 ◽  
Author(s):  
Maurizio Tamba ◽  
Sergio Bonora ◽  
Roberto Badiello
Keyword(s):  
Optical Absorption ◽  
Aqueous Solutions ◽  
Absorption Spectra ◽  
Pulse Radiolysis ◽  
Oh Radicals ◽  
Optical Absorption Spectra ◽  
Transient Species ◽  
Decay Kinetics ◽  
Kinetics Of

The pulse radiolysis of aqueous solutions of selenomethionine has been studied under both neutral and acid conditions and the transient optical absorption spectra have been observed. The reactivities of both eāq and OH radicals have been measured as well as the formation and the decay kinetics of the transient species.

Kinetics of Radiation-Induced Optical Absorption Spectra in LPX-100, -200 Protective Glasses

Atomic Energy ◽  
2019 ◽  
Vol 127 (2) ◽  
pp. 109-114
Author(s):  
I. I. Dolgov ◽  
P. I. Dolgov ◽  
D. V. Shiyan ◽  
V. V. Kazakov ◽  
A. M. Gorchakov ◽  
...  
Keyword(s):  
Optical Absorption ◽  
Absorption Spectra ◽  
Optical Absorption Spectra ◽  
Radiation Induced ◽  
Kinetics Of

An investigation of trapped holes and trapped excitons in alkaline earth fluorides

1970 ◽  
Vol 315 (1520) ◽  
pp. 69-97 ◽  
Keyword(s):  
Optical Absorption ◽  
Absorption Spectra ◽  
Alkaline Earth ◽  
The Self ◽  
Optical Absorption Spectra ◽  
Absorption Bands ◽  
Recombination Luminescence ◽  
X Ray ◽  
Kinetics Of ◽  
Hole Centres

The e. p. r. and optical absorption spectra of the self-trapped hole (V k ) centres in CaF 2 , SrF 2 and BaF 2 have been measured and it is shown that the molecular axes of these centres are alined along <100>. Preferential alinement of the V k centres along a particular cube edge is readily produced by bleaching into the optical absorption bands of the V k centre at 77 K with linearly polarized light. The anisotropy created in the crystals by preferential alinement is detected in both the e.p.r. and optical spectra. The thermally induced decay of the optically alined V k centres is monitored by e. p. r. methods and it is shown that, in CaF 2 , linear (0°) motion of the V k centres predominates over the entire decay range (85 to 138 K). In SrF 2 linear motion predominates in the early stages of decay ( ca . 110 K) but random (90°) motion sets in at higher temperatures ( ca . 120 K). In BaF 2 only random motion is observed. The kinetics of reorientation and decay of the V k centre are investigated. A band observed in the X -ray fluorescence of CaF 2 (at 279 nm), SrF 2 (at 300 nm) and BaF 2 (at 310 nm) is assigned to emission of the self-trapped exciton by comparison with a similar band in the recombination luminescence of the V k centre (due to e - + V k ). The temperature dependence of the X -ray fluorescence intensity is described. The polarization properties of the recombination luminescence are investigated on crystals containing optically alined V k centres. The e. p. r. and optical absorption spectra of trapped hole centres involving other lattice defects are also described. One such centre, with its molecular axis close to <111>, involves an interstitial fluorine ion and is named the V H centre. Other centres with molecular axes close to <100> appear to be stabilized by impurity ions and are labelled V KA and V KA' centres. The V H centre occurs in CaF 2 , SrF 2 and BaF 2 , the V KA centre in SrF 2 and BaF 2 , and the V KA’ centre only in BaF 2 . The kinetics of reorientation and decay of the V KA centre have been investigated. We give a general discussion of the properties of hole centres, including the H centre, in alkaline earth fluorides.

scholarly journals Fast optical absorption spectra calculations for periodic solid state systems

2020 ◽  
Vol 15 (1) ◽  
pp. 89-113
Author(s):  
Felix Henneke ◽  
Lin Lin ◽  
Christian Vorwerk ◽  
Claudia Draxl ◽  
Rupert Klein ◽  
...  
Keyword(s):  
Solid State ◽  
Optical Absorption ◽  
Absorption Spectra ◽  
Optical Absorption Spectra

NIR and Upconversion Luminescence Properties of Nd3+ Doped in Gd2O3-CaO-SiO2-B2O3 Glass System

2014 ◽  
Vol 548-549 ◽  
pp. 124-128 ◽  
Author(s):  
S. Insiripong ◽  
S. Kaewjeang ◽  
U. Maghanemi ◽  
H.J. Kim ◽  
N. Chanthima ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Optical Absorption ◽  
Absorption Spectra ◽  
Upconversion Luminescence ◽  
Emission Spectra ◽  
Concentration Quenching ◽  
Luminescence Spectra ◽  
Optical Absorption Spectra ◽  
Glass Matrices ◽  
Nir Luminescence

In this work, properties of Nd3+ in Gd2O3-CaO-SiO2-B2O3 glass systems with composition 25Gd2O3-10CaO-10SiO2-(55-x)B2O3-xNd2O3 where x = 0.0, 0.5, 1.0, 1.5, 2.0 and 2.5 mol% were investigated. The optical absorption spectra show peaks at 4F3/2 (877 nm) , 4F5/2+2H9/2 (802 nm), 4F7/2+4S3/2 (743 nm), 4F9/2 (682 nm), 2H11/2 (627 nm), 2G7/2 +4G5/2 (582 nm), 4G7/2 +2K13/2 (527 nm), 4G11/2 (481 nm), 2P1/2 (427 nm) and 2L15/2 + 4D1/2 + 1I11/2+ 4D5/2+ 4D3/2 (355 nm) reflecting the Nd3+ ions in glass matrices. The densities were increased with increasing of Nd2O3 concentration. This indicates the increase of the molecular weight by the replacement of B2O3 with a heavier Nd2O3 oxide in the glass. The upconversion luminescence spectra show bands at 393 nm for all Nd2O3 concentration and the strongest intensity from 2.5 % mol of Nd2O3 was obtained. For NIR luminescence, the intensity of Nd3+ emission spectra increases with increasing concentrations of Nd3+ up to 1.5 mol% and beyond 1.5 mol% the concentration quenching is observed.

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