Fluorescence and Judd-Ofelt Analysis of Er3+ Doped CaF2 Transparent Ceramic

2014 ◽  
Vol 875-877 ◽  
pp. 23-27
Author(s):  
Ru Zhen Xing ◽  
Bing Chu Mei ◽  
Jing Hong Song ◽  
Xiao Nv Li
Keyword(s):  
Excited States ◽  
Cross Sections ◽  
Fluorescence Spectra ◽  
Room Temperature ◽  
Transition Probabilities ◽  
Radiative Transition ◽  
Transparent Ceramic ◽  
Ofelt Theory ◽  
Radiation Trapping ◽  
Intensity Parameters

In this paper, we evaluated the spectra parameters of Er3+.The absorption spectra of Er3+:CaF2transparent ceramic was measured at room temperature (RT). Based on the Judd–Ofelt theory, the intensity parameters were Ω2= 5.02×10−20cm2, Ω4= 3.40×10−20cm2and Ω6= 0.38×10−20cm2, and then the values of the radiative transition probabilities, radiative lifetimes and integrated emission cross-sections of excited states were calculated. Full width at half maximum (FWHM) of the fluorescence spectra for4I13/2→4I15/2transition was investigated, being 17nm. The decay time was found to be 24.3ms, which is longer than the theoretically calculated value indicating a radiation trapping effect in this work.

Judd-Ofelt Analysis of a Dendrtic Type Europium Complex/Silicone Rubber

2011 ◽  
Vol 233-235 ◽  
pp. 1227-1230 ◽  
Author(s):  
Hao Liang ◽  
Fang Xie
Keyword(s):  
Cross Sections ◽  
Silicone Rubber ◽  
Radiative Lifetime ◽  
Radiative Transition ◽  
Optical Devices ◽  
Europium Complex ◽  
Stimulated Emission ◽  
Ofelt Theory ◽  
Intensity Parameters ◽  
Radiative Transition Rate

A dendritic type europium complex/silicone rubber has been prepared. According to the luminescence spectrum, the Judd-Ofelt theory was adopted to calculate the intensity parameters Ω2and Ω4. The total radiative transition rate (640.1 s-1), radiative lifetime (1.562 ms) and the stimulated emission cross-sections (46.19×10-22cm2) of the5D0exciting state have been evaluated. Analysis reveals that the europium (III) chelating polymer is promising for use in optical devices.

scholarly journals Spectroscopic Studies of Er3+-Yb3+ Codoped Multicomposition Tellurite Oxide Glass

2014 ◽  
Vol 895 ◽  
pp. 323-333 ◽  
Author(s):  
Sharudin Omar Baki ◽  
L.S. Tan ◽  
C.S. Kan ◽  
Halimah Mohamed Kamari ◽  
A.S.M. Noor ◽  
...  
Keyword(s):  
Room Temperature ◽  
Near Infrared ◽  
Transition Probabilities ◽  
Branching Ratios ◽  
Spectroscopic Studies ◽  
Oxide Glass ◽  
Near Infrared Spectra ◽  
Intensity Parameters ◽  
Measured Absorption

Multicomposition of Er3+-Yb3+codoped tellurite oxide, TeO2-ZnO-PbO-TiO2-Na2O glass has been investigated. Detailed spectroscopic study of the Judd-Ofelt analysis has been performed from the measured absorption spectrum in order to obtain the intensity parameters Ωt(t=2, 4, 6). The calculated Ωtvalues were then utilized in the determination of transition probabilities, radiative lifetimes and branching ratios of the Er3+transitions between theJ(upper)-J(lower) manifolds. Both visible upconversion and near-infrared spectra were characterized under the 980 nm laser diode excitation at room temperature.

scholarly journals Benchmarking Current Capabilities for the Generation of Excitation and Photoionisation Atomic Data

Galaxies ◽  
2018 ◽  
Vol 6 (3) ◽  
pp. 90 ◽  
Author(s):  
Catherine Ramsbottom ◽  
Connor Ballance ◽  
Ryan Smyth ◽  
Andrew Conroy ◽  
Luis Fernández-Menchero ◽  
...  
Keyword(s):  
Numerical Methods ◽  
Cross Sections ◽  
Transition Probabilities ◽  
Energy Levels ◽  
Radiative Transition ◽  
Atomic Data ◽  
High Quality ◽  
Astronomical Instruments ◽  
First Time ◽  
Line Strengths

The spectra currently emerging from modern ground- and space-based astronomical instruments are of exceptionally high quality and resolution. To meaningfully analyse these spectra, researchers utilise complex modelling codes to replicate the observations. The main inputs to these codes are atomic data such as excitation and photoionisation cross sections, as well as radiative transition probabilities, energy levels, and line strengths. In this publication, the current capabilities of the numerical methods and computer packages used in the generation of these data are discussed. Particular emphasis is given to Fe-peak species and the heavy systems of tungsten and molybdenum. Some of the results presented to highlight certain issues and/or advances have already been published in the literature, while other sections present new recently evaluated atomic data for the first time.

scholarly journals Measurement of the A-Value of the Intersystem Transition in Al II at 2670 Å: Å Progress Report

1984 ◽  
Vol 86 ◽  
pp. 163-166
Author(s):  
B. Carol Johnson ◽  
H.S. Kwong
Keyword(s):  
Cross Sections ◽  
Radiative Decay ◽  
Transition Probabilities ◽  
Radiative Transition ◽  
Electron Excitation ◽  
Spectral Lines ◽  
Metastable Level ◽  
Astrophysical Plasmas ◽  
Atomic Ions ◽  
A Value

Ratios of intensities of spectral lines produced in the radiative decay of collisionally-excited levels of atomic ions are versatile indicators of electron density in astrophysical plasmas when one of the lines involves a metastable level (see the review by Feldman 1981 and references therein). Radiative transition probabilities (A-values) and electron excitation cross sections are necessary for accurate, quantitative analyses of these plasmas. The work reported here is part of a program of measurements of astrophysically interesting A-values and radiative lifetimes (see the review by Smith et al. 1984); until we began, such anaylyses of astrophysical plasmas depended upon unconfirmed calculated A-values.

Energies and Auger widths of the high-lying double-excited states for Be-like neon

2011 ◽  
Vol 89 (6) ◽  
pp. 697-702 ◽  
Author(s):  
Lin Zhuo ◽  
Bing-Cong Gou ◽  
Feng Wang
Keyword(s):  
Saddle Point ◽  
Excited States ◽  
Transition Probabilities ◽  
Radiative Transition ◽  
Oscillator Strengths ◽  
Doubly Excited States ◽  
Rotation Method ◽  
Resolution Electron ◽  
Doubly Excited ◽  
Theoretical Results

Energies and Auger widths of high-lying doubly-excited states 1s23lnl′ (n = 3–6) for Be-like neon are calculated using a saddle-point variational method and saddle-point complex-rotation method. The relativistic corrections and mass polarization are obtained with first-order perturbation theory. The configuration structure of the high-lying doubly-excited series is checked by relativistic perturbation corrections. The oscillator strengths and radiative transition probabilities are also calculated. Our results of energies and Auger widths are compared with the available theoretical results in the literature. Auger channel energies are compared with those from high-resolution electron spectroscopy. Excellent agreement is obtained in each state.

Atomic and Molecular Properties of Metals from Artificial Cloud Experiments in the Upper Atmosphere

1974 ◽  
Vol 29 (3) ◽  
pp. 411-418 ◽  
Author(s):  
S. Drapatz ◽  
L. Haser ◽  
K.-W. Michel
Keyword(s):  
Excited States ◽  
Cross Sections ◽  
Transition Probabilities ◽  
Chemical Reactivity ◽  
Metal Vapor ◽  
Molecular Properties ◽  
Upper Atmosphere ◽  
Oxidation Processes ◽  
Radiative Transitions ◽  
Theoretical Predictions

Time and frequency resolved observations of metal vapor clouds in the upper atmosphere can be used to obtain information on atomic and molecular properties of the metals involved, e. g. atomic transition probabilities, photoionization cross sections, chemical reactivity of atoms in the ground state and in excited states. Experimental techniques of evaporation, the methods of obser­vation and some of the more important results are discussed for Sr, Ba and Eu, in particular those which cannot be derived by laboratory experiment, namely, radiative transitions and oxidation pro­cesses which involve metastable states. Especially one finds that the photoionization and oxidation processes of Eu and Ba are significantly different in contrast to theoretical predictions

Quenching of CO(B1Σ+,υ=0)by He,Ne,Ar,H2and D2

1973 ◽  
Vol 28 (5) ◽  
pp. 717-724 ◽  
Author(s):  
F. J. Comes ◽  
E. H. Fink
Keyword(s):  
Cross Sections ◽  
Transition Probabilities ◽  
Radiative Lifetime ◽  
Radiative Transition ◽  
Experimental Conditions ◽  
Steady State Fluorescence ◽  
Resonance Band ◽  
Straight Lines ◽  
Effective Collision ◽  
Sample Pressure

Excitation of CO molecules into the lowest vibrational level of the B1Σ+ electronic state by absorption of the (B 1Σ+υ′=0 →X 1Σ+ ,υ′′=0) resonance band at 1150 Å has been studied under various experimental conditions by observing the steady state fluorescence of the (B 1Σ+→A1Π) Angstrom bands. Stern-Volmer plots of the fluorescence intensities at the addition of various foreign gases yielded straight lines whose slopes k̃qм = kqм · τeff were strongly dependent on the CO sample pressure. This effect was found to be due to changes of the effective radiative lifetime of the B 1Σ+υ′=0 because of resonance trapping of the (0,0) band of the (B → X) fluorescence. The CO(B 1Σ+υ′=0) molecules are found to be quenched by He, Ne, Ar, H2 and D2 with effective collision cross sections of 0.23, 0.48, 22.4, 10.7, and 11.4 Å2, respectively, at 298 °K. In addition, an approximate value for the ratio ABA/ (ABA+ABX)of the radiative transition probabilities of the (B → A) and (B → X) transitions could be derived from the measurements.

scholarly journals RELATIVISTIC CALCULATION OF THE RADIATIVE TRANSITION PROBABILITIES AND LIFETIMES OF EXCITED STATES FOR THE RUBIDIUM ATOM IN A BLACK-BODY RADIATION FIELD

2021 ◽  
pp. 126-133
Author(s):  
P. Zaichko ◽  
A. Kuznetsova ◽  
A. Tsudik ◽  
V. Mansarliysky
Keyword(s):  
Radiation Field ◽  
Excited States ◽  
Transition Probabilities ◽  
Theoretical Data ◽  
Black Body ◽  
Radiative Transition ◽  
Relativistic Energy ◽  
Effective Lifetime ◽  
Rubidium Atom ◽  
Relativistic Calculation

We present the results of relativistic calculation of the radiative transition probabilities and excited states lifetimes for a heavy Rydberg atomic systems in a black-body (thermal) radiation field on example of the rubidium. As theoretical approach we apply the combined generalized relativistic energy approach and relativistic many-body perturbation theory with ab initio Dirac zeroth  approximation. There are obtained the calculational data for the radiative transition probabilities and excited states lifetimes, in particular, the rubidium atom in the Rydberg states with principal quantum number n=10-100. It is carried out the comparison of obtained theoretical data on the effective lifetime for the group of Rydberg  nS states of the rubidium atom at a temperature of T = 300K with experimental data as well as data of alternative theoretical calculation based on the improved quasiclassical model.  It is shown that the  accuracy of the theoretical data on the radiative transition probabilities and excited states lifetimes is provided by a correctness of the corresponding relativistic wave functions and accounting for the exchange-correlation effects.

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