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finger print region
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  finger print region
No difference is observed between 2b and 3b in the finger-print region on their IR spectra.
      
A unique characteristic is the wide frequency range including the so-called finger print region.
      


In this paper, the Fourier infrared spectra of N,N-dimethylformamide-(DMF ) and N,N-dimethylacetamide (DMA) and their water-containing sample have been investigated in the range 100-4000cm-1. The changes of frequencies and intensities resulted by the hydration of DMF and DMA have been observed from the substraction spectra.The bands at 1674 and 1647cm-1 are assigned to the C=O stretching vibration for the DMF and DMA, which decrease to 1651 and 1626cm-1 respectively due to the formation of hydrogen bond between...

In this paper, the Fourier infrared spectra of N,N-dimethylformamide-(DMF ) and N,N-dimethylacetamide (DMA) and their water-containing sample have been investigated in the range 100-4000cm-1. The changes of frequencies and intensities resulted by the hydration of DMF and DMA have been observed from the substraction spectra.The bands at 1674 and 1647cm-1 are assigned to the C=O stretching vibration for the DMF and DMA, which decrease to 1651 and 1626cm-1 respectively due to the formation of hydrogen bond between C=O and water upon hydration.The hydration of DMF and DMA may also be characterized by the formation of hydrogen bond with the lone electron pair of the amide nitrogen. This may be seen from the substraction spectra of water-containing DMF and DMA in the IR finger-print region and also in the far IR region. The following bands change upon hydration. 1389, 1094, 659, 404, 354 and 329cm-1 for DMF; 1397, 1188, 1014 and 591cm-1 for DMA.On the other hand, the characteristic frequencies of pure water peaks at 1646 and 3403cm-1 also change to 1690 and 3500cm-1 upon hydration with DMF, or to 1663 and 3469cm-1 upon hydration with DMA, because the electron density of the water molecule is increased as a result of receiving some electronic charge from the Lewis base.

应用光谱减法研究了二甲基甲酰胺(DMF)和二甲基乙酰胺(DMA)水化作用所引起的红外光谱变化,由于羰基和水分子形成氨键的水化作用,含水DMF和DMA的羰基伸缩振动向低波数移动,根据含水DMF和DMA中红外指纹区及远红外区某些谱带的变化,水化作用似乎也表现为酰胺基上具有孤对电子的氮原子与水分子形成氢键。DMF和DMA的水化作用使水峰向高波数移动。

This study adopts IR analysis of the solid powder.We study crystal kinetics problem of α-Fe_2O_3 by the structure sensitivity of finger-print region of IR.This paper indicates that the grown process of the α-Fe_2O_3 crys-tal from heat decompose has a characteristic of the common solid crystal kinetics.IR analysis supplies a quick and a handy new way.

本研究采用了红外光谱固体粉末分析法,利用其在指纹光波区的结构敏感特性研究了α-Fe_2O_3的结晶动力学问题.本研究表明.由热分解获得的α-Fe_2O_3晶体成长过程,具有一般固态结晶动力学的特点.红外分析提供了对这类问题研究的一种快速简便的新方法.

Fourier-translation Infrared Spectrography combined with Diffuse Reflection Apparatus can obtain the infrated spectrum of samples in original state without destruction quickly and conveniently.So attempts has been carried out to judge the counterfeit of jewels,bank notes,stamps and others.The experimental results show that there are some characteristic absorption rules in the infrared spectrum analysis.Such as the finger print region absorptions of infrared spectrum between the true and false jewels different...

Fourier-translation Infrared Spectrography combined with Diffuse Reflection Apparatus can obtain the infrated spectrum of samples in original state without destruction quickly and conveniently.So attempts has been carried out to judge the counterfeit of jewels,bank notes,stamps and others.The experimental results show that there are some characteristic absorption rules in the infrared spectrum analysis.Such as the finger print region absorptions of infrared spectrum between the true and false jewels different obviously.The bank notes and stamps seem not so deviately but still can be used as detective criterion.The study shows that the infrared spectrum analysis can play a supporting role in the judgement of counterfeits by other methods and make them more scientifically and correctly.

由于使用傅立叶变换红外光谱和漫反射装置 ,可以在不破坏样品原状的情况下快速、方便地得到珠宝、纸币、邮票的红外光谱图 ,因此尝试将红外光谱分析用于珠宝、纸币、邮票等贵重物品的真伪鉴别。实验中发现一些特征吸收峰规律 ,如珠宝的真伪品在红外光谱的指纹区吸收峰特征有明显差别 ,而纸币、邮票的指纹区差别虽然较小 ,但仍可作为鉴别的依据。研究表明 ,红外光谱分析可作为其它鉴别真伪方法的一种补充手段配合使用 ,使鉴别的科学性、准确性进一步提高

 
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