Ratnakaram Y C, Srihari N V, Kumar A Vijaya, Naidu D Thirupathi, Chakradhar R P S
Department of Physics, S.V. University Post-Graduate Centre, Kavali 524 201, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2009 Feb;72(1):171-7. doi: 10.1016/j.saa.2008.09.008. Epub 2008 Oct 8.
Spectroscopic investigations were performed on 68NH(4)H(2)PO(4).xLi(2)CO(3)(30-x)K(2)CO(3) and 68NH(4)H(2)PO(4).xNa(2)CO(3)(30-x)K(2)CO(3) (where x=5, 10, 15, 20 and 25) glasses containing 2 mol% Nd(2)O(3). Various spectroscopic parameters (Racah (E(1), E(2), E(3)), spin-orbit (xi(4f)) and configuration interaction (alpha)) are reported. Judd-Ofelt intensity parameters (Omega(2), Omega(4), Omega(6)) are calculated for Nd(3+) doped two mixed alkali phosphate glass matrices. From the magnitude of Judd-Ofelt parameters, covalency is studied as a function of x in the glass matrix. Using Judd-Ofelt intensity parameters, total radiative transition probabilities (A(T)), radiative lifetimes (tau(R)), branching ratios (beta) and integrated absorption cross sections (Sigma) have been computed for certain excited states of Nd(3+) in these mixed alkali phosphate glasses. Emission cross sections (sigma(P)) are calculated for the two transitions, (4)G(7/2)-->(4)I(11/2) and (4)G(7/2)-->(4)I(13/2) of Nd(3+) in these mixed alkali phosphate glasses. Optical band gaps (E(opt)) for direct and indirect transitions are reported.
对含有2 mol% Nd₂O₃的68NH₄H₂PO₄·xLi₂CO₃(30 - x)K₂CO₃和68NH₄H₂PO₄·xNa₂CO₃(30 - x)K₂CO₃（其中x = 5、10、15、20和25）玻璃进行了光谱研究。报告了各种光谱参数（拉卡（E₁、E₂、E₃）、自旋轨道（ξ₄f）和组态相互作用（α））。计算了Nd³⁺掺杂的两种混合碱金属磷酸盐玻璃基质的贾德 - 奥费尔特强度参数（Ω₂、Ω₄、Ω₆）。根据贾德 - 奥费尔特参数的大小，研究了玻璃基质中x的函数关系下的共价性。利用贾德 - 奥费尔特强度参数，计算了这些混合碱金属磷酸盐玻璃中Nd³⁺某些激发态的总辐射跃迁概率（Aₜ）、辐射寿命（τᵣ）、分支比（β）和积分吸收截面（Σ）。计算了这些混合碱金属磷酸盐玻璃中Nd³⁺的(⁴G₇/₂)→(⁴I₁₁/₂)和(⁴G₇/₂)→(⁴I₁₃/₂)这两个跃迁的发射截面（σₚ）。报告了直接和间接跃迁的光学带隙（Eₒₚₜ）。
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