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The optical absorption spectra of EuCl3 in aqueous and acidic solutions were measured in the visible anduv regions of the spectrum. The concentration as well as the temperature of the solutions were varied to establish an accurate
free-ion energy level scheme of Eu3+. The energy levels were assigned on the basis of a correlation between the calculated and the experimentally observed transition
energies and associated band intensities. 相似文献
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Single crystals of KGd(WO4)2 doped with Nd3+ and Er3+ ions were grown by the top seeded solution growth method. Detailed analysis of the room-temperature absorption spectra was performed using the conventional Judd-Ofelt theory and actual dependence of the refractive index on the wavelength. In addition to the intensity parameters Ω2,Ω4,Ω6, the branching ratios and radiative lifetimes were estimated for all possible transitions in the studied spectral region. Those transitions which can be potentially used for laser applications have been identified for both ions. 相似文献
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在强场图像中构造了四角对称环境中Cr2+离子包括自旋单态在内的完全能量矩阵, 通过对角化能量矩阵方法, 计算得到了BaCrSi4O10与AgGaSe2:Cr2+吸收光谱的精细结构及自旋单态对零场分裂参量的影响. 从理论上给出了BaCrSi4O10与AgGaSe2:Cr2+吸收光谱的精细结构及BaCrSi4O10的零场分裂参量值. 计算结果显示自旋单态对零场分裂参量D的影响完全可忽略, 但对a和F的影响比较大. 这种影响主要来自自旋-轨道耦合导致的自旋五重态与自旋三重态和自旋单态的相互作用, 而自旋轨道耦合的选择定则显示自旋单态并非直接影响五重态而是通过自旋三重态间接地影响基态的五重态. 因此, 为了得到准确的零场分裂参量值, 所有的自旋态都应该考虑. 相似文献
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The influence of anion-cation interactions on the structure and electronic absorption spectra of cationic 5,10,15,20-tetrakis-(4-N-methylpyridyl)porphyrin and anionic 5,10,15,20-tetrakis-(4-sulfonatophenyl)porphyrin has been investigated by absorption spectroscopy and molecular modeling. It is shown that the shifts of bands in the electronic absorption spectra appearing when passing from aqueous solutions to solutions in organic solvents are due to the interaction of ionized peripheral substituents of the porphyrin macrocycle with counterions. The bathochromic shift of the Q
x
transition is due to the influence of counterions on the energy characteristics of the molecule itself, primarily, as a result of Coulomb interactions changing the relative position of the orbitals and the distribution of electron density on them. The hypsochromic shift of the Q
y
transition is a consequence of the increase in the dihedral angle between the plane of the porphyrin macrocycle and the aromatic rings with ionized groups due to the decrease in the -electron interaction between them under the action of counterions. 相似文献
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腔靶软X射线能谱结构的实验研究 总被引:5,自引:1,他引:4
叙述了利用双狭缝透射光栅谱仪,在高功率激光物理联合实验室神光装置上,对腔靶不同位置的能谱进行诊断,给出了腔靶源区能谱的空间分布和爆区的能谱结构,为腔靶辐射场的研究提供了重要信息。 相似文献
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A. S. Yasyukevich A. V. Mandrik N. V. Kuleshov E. Yu. Gordeev S. L. Korableva A. K. Naumov V. V. Semashko P. A. Popov 《Journal of Applied Spectroscopy》2007,74(6):844-850
Yb3+ (2.7 at.%):Na4Y6F22 and Yb3+(1 at.%):LiLuF4 crystals were grown by the Bridgman-Stockbarger method. We measured the temperature dependences of the thermal conductivity
of the crystals and the absorption spectra. We determined the radiative lifetime of the Yb3+ ion in these crystals (1.94 msec and 2.13 msec) and calculated the stimulated emission cross section spectra.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 74, No. 6, pp. 761–766, November–December, 2007. 相似文献
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The nonlinear effect of ponderomotive force of high-frequency ion motion on the low-frequency motion of ions coupling with the dust density fluctuation is investigated. The nonlinear localized structure described by Zakharov equations and nonlinear Schr?dinger equation in dusty plasma are obtained. Envelope solitons for high-frequency ion motion and the dust density cavitons are also obtained and discussed. 相似文献
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T. K. Solovykh 《Journal of Applied Spectroscopy》1997,64(5):654-657
The role of impurity ions in formation of the optical properties of rare-earth orthoferrites is investigated. Optical spectra
of the substituted against unsubstituted orthoferrites are presented. The influence of different isovalent substitutions on
the optical absorption of orthoferrites that are promising for magnetooptics is studied.
Institute of Solid-State and Semiconductor Physics of the Academy of Sciences of Belarus, 17, P. Brovka St., Minsk, 220072,
Belarus. Translated from zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 5, pp. 642–645, September–October, 1997. 相似文献
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The Raman and FTIR spectra of three metal guanidinium sulfates, [C(NH2)3]2MII(H2O)4(SO4)2, (MII = Mn, Cd and VO), are recorded. The observed spectral bands are assigned in terms of the fundamental modes of vibration of the guanidinium ions, sulfate groups and water molecules. The appearance of the sulfate tetrahedra's ν1 and ν2 modes in the IR spectra and the partial lifting of the ν4 mode in the Raman spectra indicate the distortion of the SO42− tetrahedra in the structure, so that its symmetry is lowered from Td to C1. The geometry of the sulfate group in guanidinium vanadyl sulfate does not deviate much from that of the average sulfate group. The distortion of the SO4 tetrahedra is stronger in GuCds than in GuMnS. The CN3 group in the guanidinium ion is planar (D3h point group) in GuCdS and GuMnS, whereas it is lowered in the vanadyl compound. Furthermore, the spectral analyses show the presence of weak hydrogen bonds in the structures. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
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CdSxSe1-x纳米微晶的辐射跃迁过程 总被引:2,自引:0,他引:2
利用变温吸收光谱和光致发光光谱研究了CdSxSe1-x纳米微晶的辐射跃迁过程.由Varshni公式,拟合了微晶的吸收峰随温度的变化.根据变温发射光谱,研究了发光峰位置和温度的依赖关系,并分析了吸收峰和发光峰随温度变化的快慢.对发光的动力学过程.作了简单的分析. 相似文献
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根据气液段塞流气弹区相界面结构特征将气弹分为气弹头、气弹体、水跃面和气弹尾四部分,并根据各自的流动和界面结构特征分别进行模化,建立了描述不同倾角的圆管内气液段塞流气弹区相界面结构的一维理论模型.该模型的计算结果表明气液混合Froude数、管道倾角和气弹长度显著影响气液段塞流气弹区相界面结构,计算与实验结果吻合良好. 相似文献
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利用可调谐激光长程吸收光谱测量系统,记录到1.315μm附近高气压(80kPa和40kPa)CO2的高分辨率吸收光谱,拟合分析获得谱线参数,结果与HITRAN 2k的数据基本一致。用程差法测量了绝对吸收,氧碘激光频率(7 603.138 5cm-1)的总吸收截面为(0.23~0.29)×-24cm2。仅计算谱线吸收的吸收截面为0.18×10-24cm2。在1.315μm波段COCO2存在连续吸收,吸收截面为(0.05~0.11)×10-24cm2。还讨论了测量误差问题。 相似文献
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We have used IR spectroscopy to study the structure of tellurium germanate glasses synthesized in the system TeO2-GeO2-B2O3-PbO. The structure of the glasses consists of [BO3], [BO4], [GeO4], [GeO6], [TeO3], and [PbO6] groups. Changes in the coordination of boron and germanium ions occur when the PbO and GeO2 contents in the glasses increase. The glasses are attractive for designing optical and laser devices.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 74, No. 1, pp. 78–81, January–February, 2007. 相似文献
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