An attenuated total reflectance far-UV spectrometer
An attenuated total reflectance far-UV spectrometer
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DOI：
10.1063/1.2796928
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发表时间：
2007-10-01
影响因子：
1.6
通讯作者：
Ozaki, Yukihiro
中科院分区：
文献类型：
--
作者：
Higashi, Noboru;Ikehata, Akifumi;Ozaki, Yukihiro
研制了一种基于衰减全反射（ATR）的紫外光谱仪，并在140 ~ 300 nm波长范围内对液态水（轻水和重水）进行了测试，其中包括远紫外（FUV）区。FUV透射光谱的主要限制之一是溶剂本身的强吸收。因此，水分子中n ->sigma* 跃迁的高吸收率阻碍了在170 nm以下波长区域中对水溶液进行有意义的光谱测量。我们的技术使用当光通过与样品接触的内反射元件（IRE）时通过全反射产生的倏逝波。由于渐逝场被用作光路长度，该方法允许光谱测量有利地与具有比FUV光的波长更短的路径长度的透射率方法的光谱测量相当。在这项研究中，我们已经设计了一个原始的微型IRE探头蓝宝石制成，允许检测整个n ->sigma* 过渡吸收带的水下降到140 nm。所得ATR-FUV光谱与基于菲涅耳公式的计算结果非常吻合。它也被证实，该光谱仪是同样有效的光谱测量的非水溶剂具有显着的吸收系数在FUV区域。(C)2007年，美国物理学会。
An ultraviolet spectrometer based on attenuated total reflection (ATR) has been developed and tested for liquid water (light and heavy water) in the wavelength range from 140 to 300 nm, which includes the far ultraviolet (FUV) region. One of the principal limitations of FUV transmission spectra is the strong absorption of the solvent itself. High absorptivity of the n ->sigma* transition in water molecule has thus far prevented meaningful spectral measurements of aqueous solutions in the wavelength region under 170 nm. Our technique uses the evanescent wave created through total reflection when light is passed through an internal reflection element (IRE) in contact with the sample. Since the evanescent field is used as an optical path length, the method allows spectral measurements favorably comparable with that of transmittance method with a shorter path length than the wavelength of FUV light. In this study, we have designed an original miniature IRE probe made of sapphire that allows detection of the whole n ->sigma* transition absorption band of water down to 140 nm. The obtained ATR-FUV spectra closely match calculations based on the Fresnel formula. It is also confirmed that this spectrometer is equally effective for spectral measurements of nonaqueous solvents with significant absorptivities in the FUV region. (C) 2007 American Institute of Physics.