Satellite lines in rare earth double nitrate spectra

A survey is given of the possible types of double perturbations, produced by simultaneous substitution of two impurity ions in the neighbourhood of a non-Kramers ion in a trigonal lattice. The transition of the energy levels of RM-nitrate by substitution of M′ to those of RM′-nitrate is discussed.     

Satellite lines in the optical spectrum of Mn2+ in rare earth double nitrate crystals

Satellite lines have been observed in the spectra of Mn²⁺ in crystals of lanthanum manganese double nitrate and praseodymium manganese double nitrate doped with impurity ions on Mn²⁺ sites and rare-earth sites. The lattice sites in the neighbourhood of the Mn²⁺ ions which must be occupied by impurity ions to produce satellite lines have been identified. Besides the satellite lines a common line shift was observed, which was concentration dependent.Project of the Sonderforschungsbereich Festkörperspektroskopie Darmstadt-Frankfurt supported by the Deutsche Forschungsgemeinschaft.     

Satellite lines in photoelectron spectra

A general theoretical framework is presented for treating satellite line intensities in photoelectron spectra. It is shown that aside from multiplet structure characteristic of open shell systems, satellite lines involve a breakdown of the one-electron or single particle approximation. For any choice of independent electron basis states, this breakdown can be in the form of initial state configuration interaction, final ionic state configuration interaction, or interchannel coupling (configuration interaction) among the various possible photoionization channels (ion plus photoelectron system). This last effect has not been discussed in connection with photoelectron spectroscopy but its consequences can be extremely important.     

Optical spectra of mixed anhydrous rare earth trihalides

The optical absorption spectra of 1 per cent Nd in LaCl₃ doped with Br and I have been investigated. Extra lines produced by replacing Cl ions by Br and I ions have been observed. Two contributions to the change of the energy of the absorption lines in different local environments can be separated; one which is due to the change of lattice spacing and another one which is due to the change of the ionicity of the anion.     

Raman spectra of soda-lime-silicate glass doped with rare earth

Soda-lime-silicate glasses doped with different rare earth oxides (La₂O₃, CeO₂, Nd₂O₃, Gd₂O₃ and Y₂O₃) of 1 mol% content were prepared by the traditional melting-quenching methods. In order to reveal the effects of rare earth elements on the behavior of soda-lime-silicate glass the structures of soda-lime-silicate glasses doped with different rare earth oxides were determined using an INVIA confocal microRaman spectrometer equipped with a CCD detector, and viscosities of glass melts were measured using a rotating crucible viscometer; the melting temperature of the studied glasses was derived on the basis of the Arrhenius equation. Three expressions of the fraction of non-bridging oxygen (NBO/NBO+BO), average number of non-bridging oxygen (NBO) per tetrahedron (NBO/tetrahedron) and average number of bridging corners per tetrahedron (bridges/tetrahedron) for investigated soda-lime-silicate glasses were given, and the effect of rare earth dopants on the structure of soda-lime-silicate was characterized by the Raman shift, variation of the [SiO₄] tetrahedron structural unit Qⁿ (n=1,2,3,4), fraction of non-bridging oxygen and the average number of bridging corners per tetrahedron. The effect of doping rare earth oxides into glass on the viscosity and melting temperature was interpreted by changes in structure of soda-lime-silicate glasses doped with rare earth oxides.     

Far-infrared spectra of Strontium Fluoride doped with rare earth

Far-infrared measurements (17–170 cm⁻¹) are reported for SrF₂:RE³⁺ (RE = Pr, Nd, Tb, Dy, Ho, Er, Tm).The vibrations of the F⁻_i compensation ions reveal the local symmetry (Oh, C_4v, C_3v). The concentration of ions in each local site and the frequencies of the F⁻_i vibrations in the C_4v site show a regular evolution vs RE ionic radii.The study of electronic transitions within the ground manifold of the RE ions shows a similar evolution. For Dy³⁺ we detect lines already attributed to C_3v (F⁻_i) sites. New lines observed with Er³⁺ and Dy³⁺ can be attributed to C_4v (F⁻_i) sites, and the crystal field parameters that we have calculated are close to those of the C_4v (F⁻_i) site in CaF₂.For Nd³⁺ the electronic line is close to a C_4v level observed by EPR.     

The white line inL absorption spectra of rare earth oxides

The method of curve fitting of the experimentally obtained absorption edge has been developed and successfully adopted to study the precise variation in the density of states responsible for the occurrence of the white line associated with theL _II andL _III absorption discontinuities of rare earth (RE) in their sesquioxides. The theoretical equation and the curve fitting routine is flexible enough to include all the transitions responsible for XANES as well as other phenomena such as, screening effect, variation in the potential around the metal ion due to surrounding ligand ion, charge transfer etc. An erratum to this article is available at .     

掺稀土离子激光玻璃荧光光谱的测量

介绍了荧光光谱测量系统的测量原理,讨论了激发光源、单色仪光栅、样品的制备、激发光的激发位置和入射角、探测器、荧光光谱波段等测量条件的选取对激光玻璃荧光测量结果的影响。实验表明,在掺稀土离子激光玻璃荧光光谱的测量中,只有选取合适的测量条件,才可获得准确、可靠的测试结果。     

The white line inL absorption spectra of rare earth oxides

The online version of the original article can be found at     

温度对稀土夹心双萘酞菁LB膜光学性质的影响

采用线性吸收谱和二次谐波产生技术研究了温度对具有中心对称结构的稀土夹心双萘酞菁化合物LB膜光学特性及其LB膜结构的影响。研究发现,加热可以使其LB膜的结构及分子间的相互作用发生变化,并形成J聚集体,从而使得吸收峰发生红移。稀土夹心双萘酞菁化合物约在40 ℃时其二次谐波信号有一个极小值,约在65 ℃时该化合物发生相变,使得二次谐波信号产生极大值,二次谐波信号最小时温度可高达180 ℃,说明该化合物的化学结构较为稳定。     

温度对稀土夹心双萘酞菁LB膜光学性质的影响

 采用线性吸收谱和二次谐波产生技术研究了温度对具有中心对称结构的稀土夹心双萘酞菁化合物LB膜光学特性及其LB膜结构的影响。研究发现,加热可以使其LB膜的结构及分子间的相互作用发生变化,并形成J聚集体,从而使得吸收峰发生红移。稀土夹心双萘酞菁化合物约在40 ℃时其二次谐波信号有一个极小值,约在65 ℃时该化合物发生相变,使得二次谐波信号产生极大值,二次谐波信号最小时温度可高达180 ℃,说明该化合物的化学结构较为稳定。     

Unusual line shape of B 1s core level spectra in rare earth hexaborides

We investigate the B 1s core level spectra of hexaborides, (, Ce, Pr, Nd), using high resolution X-ray photoemission spectroscopy. While all the B sites are identical, the experimental spectra exhibit a signature of multiple features manifested as an unusual asymmetry in the lower binding energy side. The analysis of the spectra reveals that the surface and bulk photoemission signals are different. In addition, the peak position shifts towards lower binding energies with the increase in 4f binding energy of the rare earth elements that can be attributed to the chemical potential shift due to lower degree of 4f-conduction electron hybridization. Decrease in temperature leads to a narrowing of the linewidth in every case. The Kondo systems exhibit more prominent narrowing of the B 1s linewidth.     

稀土矿区茶叶稀土元素ICP—AES测定

本文用ＩＣＰ－ＡＥＳ测定稀土矿区茶叶中元素，并用干扰素数法校正茶中的无机元素及其他稀土元素对待测稀土元素的光谱干扰，在最佳工作条件下，测定了茶叶样品中的稀土元素含量。     

双包层稀土掺杂光纤抽运吸收特性的分析

建立了复折射率纤芯结合有限差分束传播法的双包 层稀土掺杂光纤抽运吸收效率数值模型,利用该模型对几种常 用内包层外边界结构下双包层稀土掺杂光纤的抽运吸收系数进 行了详细的分析,得出相应双包层光纤的抽运吸收特性. 分析结果对双包层稀土掺杂光纤的优化设计具有重要的指导意义.     

Magnetic rare earth superlattices

Advances in molecular beam epitaxy deposition techniques have recently made it possible to grow, an atomic plane at a time, single crystalline superlattices composed of alternating layers of a magnetic rare earth, such as Gd, Dy, Ho, or Er, and metallic Y, which has an identical chemical structure. The primary goal of this article is to review the new and interesting magnetic structures which have been discovered in these novel superlattice systems and to consider what implications the observed phases have on our understanding of the underlying microscopic magnetic interactions. In particular, the effects of the artificial periodicity or compositional modulation, finite layer thickness, and epitaxial strain on the resulting long range magnetic order of Gd-Y, Dy-Y, Ho-Y, Er-Y, and Gd-Dy superlattices are described.     

Magnetoelastic interaction in rare earth systems

A theory of rotationally invariant spin-lattice interactions in rare earth systems is presented. It is shown that rotational invariance to leading order is ensured only if rotational interactions of first and second order in the displacements are included simultaneously in the spin-lattice Hamiltonian. The rotational second-order interactions yield effects which are as large as those of the linear rotational interaction. It is pointed out that a corresponding statement should hold also for pure strain interactions.The phonon Green's function is calculated for the paramagnetic phase of rare earth systems. It is found that in an applied magnetic field the rotational interactions cause measureable changes of the phonon dispersion and the sound velocity even for cubic symmetry. These effects turn out to be of the same order of magnitude as the conventional field-dependent strain effects and are qualitatively different from the latter. The results of our theory are illustrated by the example of SmSb, and quantitative predictions for the transverse sound velocities are given.