Chan K L A, Kazarian S G
Department of Chemical Engineering and Chemical Technology, Imperial College London, London SW7 2AZ, UK.
Appl Spectrosc. 2003 Apr;57(4):381-9. doi: 10.1366/00037020360625907.
New opportunities exist to obtain chemical images using attenuated total reflection infrared (ATR-IR) spectroscopy. This paper shows the feasibility of obtaining FT-IR images with a spatial resolution of at least 3-4 microm using a Ge ATR objective coupled with an infrared microscope. The improved spatial resolution compared to FT-IR images obtained by the transmission method is due to the high refractive index of the ATR crystal, which gives a high numerical aperture and hence, a higher spatial resolution. FT-IR imaging with a conventional diamond ATR accessory has been investigated. This is the first time that FT-IR imaging is reported using such a versatile accessory based on a diamond ATR crystal. These results showed that a spatial resolution up to 13 microm can be achieved without the use of infrared microscope objectives. One advantage of the diamond element is that it allows pressure to be applied and hence, good contact to be obtained over the whole field of view.
利用衰减全反射红外(ATR-IR)光谱获取化学图像存在新的机遇。本文展示了使用锗ATR物镜与红外显微镜相结合获得空间分辨率至少为3 - 4微米的傅里叶变换红外(FT-IR)图像的可行性。与通过透射法获得的FT-IR图像相比,空间分辨率的提高归因于ATR晶体的高折射率,这赋予了高数值孔径,从而具有更高的空间分辨率。对使用传统金刚石ATR附件的FT-IR成像进行了研究。这是首次报道基于金刚石ATR晶体的这种通用附件的FT-IR成像。这些结果表明,不使用红外显微镜物镜可实现高达l3微米的空间分辨率。金刚石元件的一个优点是它允许施加压力,因此在整个视场中能获得良好的接触。