ESR in GeS glasses

In GeS glasses ESR signals were observed at g ? 2.00. The signal in GeS₂ was a single Gaussian line with linewidth of ca. 15 G. The signal in the glass containing more sulfer than GeS₂ changed into multi-lined spectra. The signal disappeared by addition of 5 molar % arsenic. Discussion is given in the concept of ‘defects’ in the chalcogenide glass.     

去卷积和高斯拟合方法在FTIR光谱处理中的应用

讨论了FTIR光谱产生的机理,并分析了影响其光谱质量的两种原因:(1)干涉图的截断;(2)仪器采样率低.为了改善由上述两种原因引起光谱畸变,我们对其进行了仪器线型函数去卷积和高斯拟合,使其更接近实际光谱,从而使由其计算出的物理量更接近实际值,结果更精确.     

Electric Field Effect in ESR Spectra of Fe3+ and Mn4+ Centers in Thin SrTiO3 Plates

Physics of the Solid State - The electric field effect in electron spin resonance spectra of Fe3+ and Mn4+ impurity ions in thin oriented single-crystal plates of strontium titanate has been...     

Spectra of Manganese Emission Centers in Zinc Sulfide

We have investigated the photoluminescence of zinc sulfide single crystals doped with manganese and obtained from a melt under a pressure of argon. The structure of the crystals is the microtwin of sphalerite with a great number of packing defects. It is shown that the radiation spectrum consists of several individual overlapping bands, fundamental of which are the bands with maxima at 557, 578, 600, and 637 nm.     

葡萄糖粉末的近红外光谱

糖尿病患者的自我监测是减少由糖尿病引发并发症的重要手段。无创血糖监测的近红外光谱分析方法是最具有应用前景的一种，葡萄糖近红外光谱则是研究无损血糖检测基础。本文通过实验采集了葡萄糖粉末的近红外光谱，并对结果作了详细分析。     

Optically Activated Luminescence in a Natural Quartz

The spectral and kinetic characteristics of some natural quartz samples were studied by the method of optically stimulated afterglow. Defects with an unusually long time of luminescence decay of intracenter type ( = 179 msec, = 450 msec) have been revealed. Some of the parameters of these centers (stimulation and luminescence spectra, kinetics of afterglow decay, EPR spectrum, their temperature dependences, and also the stable behavior of these centers on exposure to thermal and optical effects) have been determined. Their role in the appearance of a luminescence signal ineffaceable in the process of formation of geological deposits and the possible processes leading to the afterglow of these centers are discussed.     

Analysis of the Trans Induction Effect in NMR and ESR Spectra

Abstract

The geometry and electron structure of the cyclic and polyhedral A_2n systems undergo changes when a substituent is introduced. These changes are manifested in such a way that they are observed only for those positions available to substituents. In inorganic chemistry, regularities of the substituent behavior are usually considered on the basis of the trans effect. In organic chemistry, it is on the basis of orientation theory. The regularities connected with electron density redistribution are well known. The task is to understand the mechanisi of such redistributions.     

Ti：Al2O3晶体的电子自旋共振谱研究

Ｔｉ：Ａｌ２Ｏ３晶体中的顺磁中心Ｔｉ＾３＋由于强烈的晶格自旋耦合而使其电子自旋共振吸收只有在液拟温度附近才能看到，本实验在液氮温度附近记录到由许多强的的吸收峰迭加于Ｔｉ＾３＋宽吸收线所组成的电子自旋共振谱，这些吸吸收峰被认为是Ａｌ２Ｏ３基质中的Ｆｅ＾３＋，Ｍｎ＾２＋，Ｃｒ＾３＋，Ｍｏ＾３＋，Ｆｅ＾２＋，Ｃｏ＾２＋等杂质的共振吸收及Ｔｉ＾２＋３Ａ２ｇ基态的双量子跃迁造成的。     

Photoluminescence Spectra of CaS:Er and CaS:Tb Powder Phosphors

This paper reports the method of preparation and the emission level assignments for the light emitting powder phosphors of CaS:Er³⁺ and CaS:Tb³⁺. The recorded photoluminescence spectra of these powder phosphors have shown that the light emission would be better at lower dopant concentrations.     

用拉曼散射光谱估算纳米Ge晶粒平均尺寸

用射频共溅射技术和真空退火方法制备了埋入ＳｉＯ２基底中的纳米Ｇｅ复合膜（ｎｃ－Ｇｅ／ＳｉＯ２）测量了不同温度退火后该复合膜的拉曼散射光谱，其结果与晶体Ｇｅ的拉曼谱相比，纳米Ｇｅ的拉曼峰红移峰形变宽，用拉曼谱的参数计算了纳米Ｇｅ晶粒的平均尺寸，所得结果与声子限域理论模型符合。     

温度对奶粉荧光光谱的影响

采用荧光光谱和荧光寿命技术研究了温度对奶粉荧光特征的影响.通过比较奶粉与酪蛋白、乳糖及维生素的荧光光谱,确定了奶粉的荧光主要来自酪蛋白的贡献.随着温度的升高,奶粉和酪蛋白的荧光强度减小,其中幼儿配方奶粉和成人普通奶粉的荧光强度随温度升高减小的趋势基本相同,而婴儿配方奶粉的荧光强度随温度的升高出现了一个相对变化缓慢的平台区,酪蛋白的荧光强度随温度升高呈缓慢下降的趋势,下降的速度比奶粉的要缓.酪蛋白加热到90℃然后冷却至25℃,荧光强度部分恢复,说明一部分蛋白质的结构变化或者荧光基团的活性变化是可逆的.测量了不同温度下奶粉和酪蛋白的荧光寿命.奶粉和酪蛋白的荧光寿命曲线在双指数拟合之后,都有两个寿命,这两个寿命可能来自于色氨酸和苯丙氨酸.随着温度的升高,奶粉和酪蛋白的两个荧光寿命都减小.     

Modular High-Intensity Monochromatic In Situ Illumination Set-Up for Investigating ESR Photoactive Centers in Semiconductors

A versatile, modular in situ high-intensity monochromatic illumination set-up installed on a standard Q-band ESR spectrometer equipped with a cryostat and probe head for measurements at cryogenic temperatures, which can be easily assembled from commercially available optical components is presented. Using as monochromatic light sources pig-tailed laser diodes (LDs) or fiber-coupled light-emitting diodes (LEDs), a high efficiency of the light transfer (more than 95%) through an optical guide inserted in the sample holder is achieved in the sample area of the microwave cavity. With various LEDs and LDs, one can perform ESR in situ illumination experiments from UV to far-IR, in both cw and pulse mode. Its operation is illustrated with an experiment revealing the presence of certain ESR silent defects in oxygen-doped floating-zone ultrapure Si samples irradiated at room temperature with high-energy–high-fluence electron beams and pulse annealed up to 300 °C. New information is obtained by comparing the ESR spectra recorded at T = 120 K, without and with 1.06 µm across-the-gap in situ illumination.     

腐植物质吸附在银粉上的拉曼光谱

腐植物质吸附在银粉上的拉曼光谱周群，郁鉴源（清华大学化学系北京１０００８４）杨育晖，张德和（中国科学院化学研究所北京１０００８０）ＲａｍａｎＳｐｅｃｔｒａｏｆＨｕｍｉｃＳｕｂｓｔａｎｃｅｓＡｄｓｏｒｂｅｄｏｎＳｉｌｖｅｒＰｏｗｄｅｒ￥ＺｈｏｕＱｕｎａ...     

Hyperfine Structure in the OD ESR Spectra of Recombining Charge Pairs in Doped Polyethylene Matrices

The hyperfine structure has been resolved in the optically detected electron spin resonance (OD ESR) spectra of radical ion pairs generated by ionizing radiation at a low dopant concentration in a solid polyethylene matrix at room temperature. The different organic molecules that can capture electrons and holes were used as the dopants. The spin-lattice relaxation times T₁ for radical ions of dopants were estimated to be tens of microseconds. The temperature dependence of OD ESR signal intensity indicates the diffusion-assisted mechanism of recombination of radical ion pairs in polyethylene.     

硅基锗薄膜的红外吸收谱和电学特性

为了解退火对硅基锗薄膜的质量、红外吸收、透射率和电学性质的影响,采用分子束外延方法用两步法在硅基上生长锗薄膜。将生长后的样品分成两部分,其中一部分进行了退火处理。对退火前后的样品用高分辨X射线双晶衍射仪测量了(400)晶面的X射线双晶衍射摇摆曲线,用傅里叶红外光谱仪测量了红外透射率和吸收谱,并用霍尔效应仪测量了退火前后样品的载流子浓度、迁移率、电阻率、电导率和霍尔系数。结果表明,退火后的薄膜质量明显提高。退火后大部分区域吸收增大,透射率明显减小,615~3 730 cm-1区间的透射率均比退火前降低了20%以上。退火后的体载流子浓度增大到退火前的23.26倍,迁移率增大到退火前的27.82倍。     

Photoluminescence Spectra of Eu3+-Doped Certain Powder Phosphors

The fluorescence properties of Eu³⁺-doped CaS, LaOCl, LaOF, YOCl and YOF powder phosphors are reported. These phosphors exhibited a reddish orange colour when excited in the UV. The photoluminescence spectra have been characterized by determining their stimulated emission cross-section values.     

Bi3+-Cys配合物的X射线粉末衍射光谱

本文研究了金属铋离子与胱氨酸配合物的合成方法，采用X射线粉末衍射光谱对配合物进行了分析鉴定，结果表明，Bi^3 能与Cys形成配合物。