Decomposition of broad absorption band at about 3·2 μm in multicomponent aluminophosphate glasses

1978 ◽  
Vol 28 (5) ◽  
pp. 576-580 ◽  
Author(s):  
K. Polák ◽  
A. Bohun ◽  
F. Fröhlich
Keyword(s):  
Absorption Band ◽  
Broad Absorption ◽  
Broad Absorption Band ◽  
Aluminophosphate Glasses

Accuracy of measurements of the band maximum shift for a broad absorption band

1973 ◽  
Vol 19 (5) ◽  
pp. 1538-1538
Author(s):  
A. I. Sidorova ◽  
T. V. Sukhanova ◽  
E. M. Ushakova
Keyword(s):  
Absorption Band ◽  
Broad Absorption ◽  
Broad Absorption Band ◽  
Band Maximum ◽  
Accuracy Of Measurements

Broad absorption band solar selective absorber analyzed by admittance loci

2016 ◽  
Author(s):  
Wei-Bo Liao ◽  
Ya-Chen Chang ◽  
Cheng-Chung Lee ◽  
Yu-Sheng Chen ◽  
Chien-Cheng Kuo
Keyword(s):  
Absorption Band ◽  
Broad Absorption ◽  
Broad Absorption Band ◽  
Admittance Loci

Optical and Scintillation Properties of Eu-Doped Calcium Orthoborate

2012 ◽  
Vol 508 ◽  
pp. 235-239 ◽  
Author(s):  
Yutaka Fujimoto ◽  
Yoshisuke Futami ◽  
Takayuki Yanagida ◽  
Shunsuke Kurosawa ◽  
N. Kawaguchi ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Absorption Band ◽  
Radio Frequency ◽  
Single Crystals ◽  
Heating System ◽  
Radio Frequency Heating ◽  
Broad Absorption ◽  
Broad Absorption Band ◽  
Decay Times ◽  
Frequency Heating

Single Crystals of Eu-Doped Calcium Orthoborate Have Been Grown by Micro-Pulling (μ-PD) Technique with Radio Frequency Heating System, and its Transmittance, Photoluminescence and Radiation Responses Were Investigated. In Transmittance Spectra, Eu-Doped Crystal Showed Broad Absorption Band around 200-450 nm, which Is due to the Complex of Charge Transfer (CT) Transition and 4f-4f Transition of Eu3+. Intense Eu2+5f-4f and Eu3+4f-4f Emission Peaks Were Observed when Excited to 265 nm and 385 nm, and the Calculated Decay Times Were 230 ns and 1.5 ms, Respectively.241Am 5.5 Mev α-Ray Excited Radioluminescence Spectra Indicated both Eu2+5f-4f and EuSuperscript text3+ 4f-4f Emission Peaks.

Study of Crystal Yb3+:Ca3Y2(BO3)4

2004 ◽  
Vol 19 (4) ◽  
pp. 1203-1207 ◽  
Author(s):  
Yan Wang ◽  
Chaoyang Tu ◽  
Changcang Huang ◽  
Zhenyu You
Keyword(s):  
Absorption Spectrum ◽  
Absorption Band ◽  
Emission Spectra ◽  
Czochralski Method ◽  
X Ray Diffraction ◽  
Broad Absorption ◽  
Broad Absorption Band ◽  
Orthorhombic System ◽  
X Ray ◽  
Broad Emission

Yb3+-doped single-crystal Ca3Y2(BO3)4 with dimension φ20 × 55 mm was grown by the Czochralski method. The structure of it was determined by x-ray diffraction. It belongs to the orthorhombic system, space group Pnma, with the following parameters: a= 7.1690(4), b = 15.4758(8), c = 8.5587(6) Å, V = 949.55(10)Å3, Mr = 537.51, Z = 2, Dc = 3.8 g/cm3, (MoKa) = 0.71073 Å, F(000) = 508, μ = 6.927 mm-1, final R = 0.0670, and wR = 0.1542 for 2975 independent reflections. The structure of Yb:Ca3Y2(BO3)4 is made up of three set of M-oxygen distorted polyhedrons, and three set of BO3 planar triangles. Ca2+ and Y3+ ions occupy three M sites statistically. Yb3+ ions substitute Y3+ ions to enter these three lattices. The adsorption and emission spectra were measured. It exhibits a broad absorption band ranging from 850 to 1000 nm in the absorption spectrum, which is well matched with the emission wavelength of a laser diode. A broad emission spectrum ranging from 927.95 to 1102.7 nm was observed under the excitation of 895 nm.

The Symmetry of the EL2 Defect in GaAs

1989 ◽  
Vol 163 ◽  
Author(s):  
P. Trautman ◽  
J.M. Baranowski
Keyword(s):  
Absorption Band ◽  
Point Group ◽  
Uniaxial Stress ◽  
Linear Dichroism ◽  
Broad Absorption ◽  
Broad Absorption Band ◽  
Zero Phonon Line ◽  
Localized State ◽  
Jahn Teller ◽  
Order Of Magnitude

AbstractLinear dichroism has been measured in the broad absorption band of the EL2 defect in GaAs under uniaxial stress. In addition, the splittings of the EL2 zero phonon line (ZPL) at 8378 cm-1 under uniaxial stress applied along [100], [111], and [110] directions have been measured. Splitting of the ZPL under [100] stress is over one order of magnitude smaller than under [111] stress, on the other hand, the linear dichroism in the broad absorption band is roughly equal for these two directions of stress. This is an evidence for the quenching of the coupling to tetragonal strains due to interaction with trigonal modes of the lattice (the Ham effect). Therefore, it is established, that the excited T2 state of EL2 is a localized state subject to dynamical Jahn-Teller coupling to trigonal modes of the lattice. The possibility that the excited T2 state has hydrogenic nature associated with the L minima is ruled out by the present results. The observed splittings of the ZPL together with polarization selection rules clearly indicate the tetrahedral Td symmetry of the EL2 defect ruling out any other point group in particular trigonal C3v In view of the presented experimental results, their interpretation, and recent theoretical investigations, the isolated arsenic antisite AsGa most successfully accounts for the properties of the neutral charge state of the EL2 defect.

Ultra-broad absorption band of Dy3+ doped Gd3Sc2Al3O12 garnet crystal at around 450nm: A potential crystal for InGaN LD pumped all-solid-state yellow lasers

CrystEngComm ◽  
2021 ◽  
Author(s):  
Shoujun Ding ◽  
Hao Ren ◽  
Hongyuan Li ◽  
Wenpeng Liu ◽  
Qingli Zhang ◽  
...  
Keyword(s):  
Solid State ◽  
Absorption Band ◽  
Single Crystal ◽  
Czochralski Method ◽  
Spectroscopic Properties ◽  
Garnet Crystal ◽  
High Quality ◽  
Broad Absorption ◽  
Broad Absorption Band ◽  
First Time

In this work, a high-quality 2at% Dy3+ doped Gd3Sc2Al3O12 (Dy:GSAG) single crystal was grown successfully by the Czochralski method for the first time. Spectroscopic properties of the crystal were investigated...

scholarly journals The cytochromes of mitochondria from Tetrahymena pyriformis strain ST

1972 ◽  
Vol 128 (5) ◽  
pp. 1171-1182 ◽  
Author(s):  
D. Lloyd ◽  
B. Chance
Keyword(s):  
Absorption Band ◽  
Flash Photolysis ◽  
Tetrahymena Pyriformis ◽  
Difference Spectra ◽  
Broad Absorption ◽  
Broad Absorption Band ◽  
Oxidase System ◽  
Terminal Oxidases ◽  
Cytochrome O ◽  
Α Band

1. Mitochondria of the obligately aerobic ciliate protozoon, Tetrahymena pyriformis strain ST, are unusual in that they possess a cytochrome oxidase system that does not react with reduced mammalian cytochrome c; the presence of cytochromes a603+a3 is masked in the α-band region of spectra by the broad absorption band of cytochrome a620. 2. Other haemoproteins present include cytochromes b560, b556, c553 and c549. 3. The reaction of reduced cytochrome a3 with CO is reversed by flash photolysis, and in the presence of O2 the subsequent oxidation of this cytochrome is followed by that of cytochrome a603. 4. Cytochromes a620 and b560 also react with CO and with KCN; the latter cytochrome corresponds with that designated cytochrome o by other workers. 5. The contribution of cytochrome a603 to difference spectra is revealed by making use of the fact that it does not react with KCN. 6. Cytochrome a620 is unstable, and its α-absorption band is lost from spectra of mitochondria which have been aged or treated with ultrasound, detergents or organic solvents. 7. Possible pathways of electron transport via the several different terminal oxidases in Tetrahymena mitochondria are proposed.

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