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小木虫论坛-学术科研互动平台 » 化学化工区 » 分析 » 【求助】什么是ATR矫正，如何操作
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淬火大螃蟹

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[交流] 【求助】什么是ATR矫正，如何操作

请问各位大侠，在OMNIC软件处理里面有一个高级ATR矫正，什么是ATR矫正，如果操作？谢谢赐教！
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1楼 2010-01-13 15:39:29
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淬火大螃蟹

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校正，写错了~~
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2楼2010-01-14 12:28:47
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pinguo

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淬火大螃蟹(金币+2,VIP+0):谢谢啊，OMNIC软件的帮助里面也有，看了还是不怎么懂具体怎么操作 1-16 09:47
从OPUS软件里面的帮助文件找到的，具体怎么操作我也没有做过。

In case of the extended ATR (Attenuated Total Reflection) correction feature you have to use spectra which have been measured by an ATR unit. These spectra are corrected such that the position and intensity of the absorption bands are similar to those of a spectrum acquired in transmission mode.

The correction is based on the following physical effects:

The penetration depth into the sample depends on the wavenumber in case of total absorption on the ATR crystal. This results in a modified band intensity, related to the frequency in the spectrum.

The correction of this effect is a simple spectra manipulation which has already been performed by the OPUS Convert Spectra command.

In case of ATR measurement the absorption of the sample relates to the sample refraction index which depends on the wavenumber. Due to the anomalous dispersion of the sample the band positions are erroneously shifted towards smaller wavenumbers. The correction of this effect is called extended ATR correction.

8.24.2 Performing extended ATR correction

Load the spectra measured by an ATR unit into the OPUS browser and select the Extended ATR correction command. The following dialog opens:


Drag and drop the data block from the OPUS browser to the File(s) for extended ATR correction selection field. Note that OPUS only accepts AB or ATR data blocks for ATR correction, either 2D or 3D spectra files. Using 3D files, however, requires the OPUS registry to contain a package which allows data manipulation of 3D files.

Define the following parameters:

1) Number of ATR reflections at the boundary between sample and ATR crystal

2) ATR angle of incidence with regard to the surface normal of the ATR crystal

3) Mean refraction index of the sample within the measured frequency range

Specify the material which the ATR crystal is made of. Activate the corresponding option button. Start the correction by clicking on the Calculate button.

The result is always stored in an ATR data block and overwrites the original spectrum stored in the AB or ATR data block.

1 Literature: Francis M. Mirabella, jr (ed.); Internal Reflection Spectroscopy, Theory and Applications, Marcel Dekker, Inc., 1992, p 276ff.

[ Last edited by pinguo on 2010-1-14 at 17:30 ]
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