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Thermal stability and spectroscopic properties of Ho^(3+) doped tellurite-borate glasses

Journal of Rare Earths 2015年第9期33卷 939-945页

作者：杨艳民刘延洲蔡培庆 Ramzi Maalej Hyo Jin Seo College of Physics Science and Technology Hebei University Department of Physics Pukyong National University Laboratoire Géoressources Matériaux Environnement et Changements Globaux Faculty of Sciences of Sfax Sfax University

Ho3＋ ions doped tellurite-borate glass samples with varying compositions were prepared. The compositional dependence on phenomenological Judd-Ofelt parameters was compared in different kinds of rare earth ions doped tellurite-borate glasses. Two methods were used to obtain radiative transition probability of 517 level with the aim of assuring the fitting quality. The integral absorption cross-sections and line shapes corresponding to 518--.5G6 and 518---5I7 transition of Ho3＋ ions were investigated in tellurite-borate glasses. The obtained data indicated that the integral absorption cross-sections corresponding to 518-5G6 transition of Ho3＋ ions mainly depended on phenomenological Judd-Ofelt parameter, g22, because 518---5G6 transition belonged to hypersensitive transitions, which led to a larger gP2 value. The change of line shapes of absorption spectra corresponding to 518-5G6 and 518-517 transitions of Ho3＋ ions came from the lower energy regions, which could be attributed to the changed distribution of Stark levels and thermal population.

关键词： Ho3+ tellurite-borate glasses cross sections line shapes rare earths

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Stark-broadened profiles of the spectral lines in He Ⅱ ions

Stark-broadened profiles of the spectral lines in He Ⅱ ions

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第六届全国计算原子与分子物理学术会议

作者： B.Duan M.A.Bari Z.Q.Wu J.Yan J.G.Wang Institute of Applied Physics and Computational Mathematics Pakistan Atomic Energy Commission

This paper introduces a theoretical approach for the calculations of spectral line broadening in plasmas. As an example, the line profiles of Stark broadening the Lyman pectral lines（ Lyα and Lyβ） and Paschen line（Pα） are calculated and investigated with this approach under some interesting plasma conditions. In our calculations, Dirac R-matrix methods [1]are used to calculate electron-impact broadening operators[2-6], which are assumed to be diagonal matrix to simplify. The Standard（Hooper） theory is chosen to calculate the electric microfield distribution function. Furthermore the population density（bm） of ionization state m is obtained by the Boltzmann-Saha equations. The dipole matrix and the required atomic structure data are calculated by the atomic structure GRASP package. Thus Stark-broadened line profiles of the Lyman spectral lines and P α in He II ion are computed in a systematic manner[7,8]. These spectral line-broadening parameters are considerably important for plasma spectroscopy and plasma diagnosis as well as a key stone in plasma modeling.

关键词： Stark broadening line shapes atomic data

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