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铁原子团簇的红外与微波吸收性能 总被引:2,自引:1,他引:1
以文献[1]中提出的金属原子团簇的电子能谱和吸收光谱理论为指导,对铁原子团簇的红外与微波吸收性能进行了实验测定。实验结果证明这个理论是正确的。测试结果表明:纳米级铁原子团簇材料具有很强的红外吸收性能,微米级铁原子团簇材料具有很强的微波吸收性能,与文献[3]中的理论相符。 相似文献
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利用原位红外光谱研究标题化合物在N2中的反应行为。发现它们在不同温度下能使乙酸分别转化为丙酮和甲烷。它们对乙酸的丙酮化反应活性顺序:[V3OAT]>[VFe2OAT],[V2CrOAT]>[Fe3OAT],[VCr2OAT]>[Cr3OAT][OAT=(μ3-O)(μ-O2CCH3)6(THF)3]。它们对乙酸的甲烷化反应活性顺序:[Cr3OAT]>[VCr2OAT],[V2CrOAT]>[V3OAT]>[VFe2OAT],[FeO3OAT]。对乙酸的丙酮化反应活性[Fe3OAT]明显低于[Fe3OAH][OAH=(μ3-O)(μ-O2CCH3)6(H2O)3]。对乙酸的甲烷化反应活性[Cr3OAT]也明显低于[CrOAH]。并对上述[Fe3OAT],[Cr3OAT]与[Fe3OAH],[Cr3OAH]之间差异进行了讨论 相似文献
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薄膜干涉条纹定域的确定,文献[1]~[4]等已有讨论.其中[4]较简单直观。本文在直角坐标系中推出定域中心曲面方程,作适当近似与文献[1]、[4]的结果相同,并在此基础上对条纹定域深度进行了讨论 相似文献
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运用分子动力学方法采用F-S多体势函数从原子尺度上模拟了NiAl金属间化合物中单空位的迁移运动行为,认为空位随成分的变化而采取不同的迁移方式:成分在理想化合比附近空位迁移主要以六步循环方式进行,其中VAl主要以直型[100]六步循环方式迁移,VNi以[110]型六步循环方式占优势;当成分偏离时在富Ni一侧空位迁移则以ASB方式占很大的优势.计算所得NiAl金属间化合物中单空位迁移激活能与实验值相符,从微观上合理地解释了NiAl金属间化合物淬火实验中较高淬火温度对
关键词: 相似文献
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关于变质量物体运动方程各项意义的正确解释 总被引:2,自引:1,他引:1
关于变质量物体运动方程各项意义的阐明,在现行各种理论力学教程中[1][2][3],有的不够确切,有的不够全面.本文针对这些解释作出详述,以供参考. 相似文献
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本文从对Kij、Jij的一般性讨论出发,给出氦原子第一激发态能级次序,指出了与文献[4]、[5]、[6]、[7]及[8]的差异所在. 相似文献
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本文利用现场拉曼光谱研究了中性含氯离子溶液中苯并三氮唑在铜和铁电极表面的吸附以及成膜行为,结果表明苯并三氮唑能强烈地化学吸附于铜电极和铁电极表面,形成类似[Mn(BTA)p]的配合物膜,一定程度上阻止了膜内外物质的交换,对金属起缓蚀作用。另一方面两种金属表面配合物膜均具有电位依赖性:在铜电极表面,当外加电位由-0.5V负移至-0.9时,发生了由[Cu(I)(BTA)]n向[Cu(I)Cl(BTAH 相似文献
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对于自旋I>1/2的核,其运动的相关时间τc以及核四极耦合常数NQCC是表征分子局部和微观动力学结构的重要参数. 然而,在溶液中,这些参数均难以测定. 该工作以聚氨大环-氰基合钴超分子体系为例,利用在高分子体系中广泛使用的激光光散射技术成功地测量了溶液中超分子络合物[12]aneN4[Co(CN)6], [18]aneN6[Co(CN)6], [24]aneN8[Co(CN)6],[16]aneN4[Co(CN)6], [24]aneN6[Co(CN)6] 和 [32]aneN8[Co(CN)6] 的水合半径,从而根
据Stokes-Einstein-Debye理论计算出了分子转动的相关时间τc. 这些超分子的水合半径在0.4~0.6 nm之间. 对应的转动相关时间τc在3.8~9.5×10-11 s之间. 这一时间范围对于分子量在300~500的分子,有相当的合理性. 进而,通过测量超分子在稀溶液中的纵向弛豫时间T1,结合计算出的相关时间τc,我们得到了该超分子体系中59Co的四极耦合常数,其范围在0.5~2.2 MHz之间. 我们发现,这些超分子在溶液中的四极耦合常数明显小于在固体状态时的值(5~7 MHz). 导致这一现象很可能的原因是在固体状态下59Co核周围的电场梯度是各向异性的,从而有较大的四极耦合常数值. 而在溶液中,由于分子的快速运动,各向异性被平均,因而有较小的四极耦合常数. 相似文献
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张茹 《原子与分子物理学报》1995,12(1):1-5
苟清泉在前文中[1],从理论上阐明金属原子团簇的公有化电子能谱具有分裂能级的特点,因而具有吸光的特性,并计算了Cu与Al的金属原子团簇的吸收光谱。现进一步用此理论计算碱金属团簇的电子能谱与吸收光谱。 相似文献
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Emilia Staniszewska Kamilla Malek Zofia Kaszowska 《Journal of Raman spectroscopy : JRS》2013,44(8):1144-1155
Fourier transform infrared (FT‐IR) and Raman spectroscopy is used for the non‐destructive analysis of painting materials and ageing compounds in micrometric cross sections of a glass painting. The combination of both techniques in conjunction with imaging/mapping function provides the spatial distribution of chemical components identified in vibrational spectra. The aim of our work is to show the applicability of the FT‐Raman mapping technique in the detection of painting materials. We also compare Raman information gained by using two laser excitations at 532 and 1064 nm implemented in microspectrometers with different confocality and spatial resolution. In turn among FT‐IR imaging techniques, we compare chemical images recorded in external reflection and attenuated total reflection modes that give chemical images of different size and spatial resolution. Our FT‐IR and Raman imaging characterize a number of painting materials such as pigments, binders, fillers as well as degradation products. Raman maps are constructed by using the univariate analysis. In turn, a profile of IR images requires the use of a more complex methodology. Here, we compare FT‐IR images of the painting cross sections obtained by using the univariate and hierarchical cluster analysis. We clearly show that the multivariate approach is a powerful tool for the credible construction of IR images, providing the relevant chemical information on the multicomponent stratigraphy of the samples. Moreover, the combination of all the methods allows us to demonstrate their degree of utility for the study on the paint cross sections of the works of art. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
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Mo-Fe-Bi复合氧化物的制备和光谱研究 总被引:1,自引:0,他引:1
本文采用溶胶方法和沉淀方法制备Mo-Fe-Bi复合氧化物,用FTIR、NIR FT-Raman和XRD对其进行研究。 相似文献
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用1064nm激发的近红外傅里叶变换表面增强拉曼散射技术研究腺嘌呤系列胡凤霞方炎(首都师范大学综合技术研究所,北京100037)FourierTransformSurface-EnhancedRamanSpectroscopyofSeriesofAd... 相似文献
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F. S. Manciu L. Reza L. A. Polette B. Torres R. R. Chianelli 《Journal of Raman spectroscopy : JRS》2007,38(9):1193-1198
Maya Blue is a famous indigo‐based pigment produced by the ancient Mayas. The organic/inorganic complexes inspired by Maya Blue have led to a new class of surface compounds that have novel applications to pigment industries. Materials analyzed in the present work are made by a synthetic route, and demonstrate chemical stability similar to that of the ancient Maya Blue samples. However, we have learned that stable complexes can be synthesized at much higher dye concentrations than used by the Mayas. Analysis by FT‐Raman and FT‐IR spectroscopy demonstrates the partial elimination of the selection rules for the centrosymmetric indigo, indicating distortion of the molecule. This distortion accounts for the observed color changes, as the molecular orbital structure is modified, allowing the complex to stabilize. The spectroscopic data also shows the disappearance of the indigo N H bonding, as the organic molecules incorporate into palygorskite material. A structural change of indigo to dehydroindigo during heating is suggested by this result. Infrared data confirm the loss of zeolitic water and a partial removal of structural water after the heating process. Evidence of bonding between cationic aluminum and dehydroindigo through oxygen and nitrogen is revealed by FT‐Raman measurements at higher dye concentrations. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
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本文对高山红景天提取物中的一种新化合物进行了红外和拉曼光谱的测定,并对主要谱带进行了归属和讨论。 相似文献
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