Abstract
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 mum 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 mum 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.
| Original language | English |
|---|---|
| Pages (from-to) | 381-389 |
| Number of pages | 9 |
| Journal | APPLIED SPECTROSCOPY |
| Volume | 57 |
| Issue number | 4 |
| Publication status | Published - Apr 2003 |
Keywords
- Fourier transform infrared imaging
- FT-IR imaging
- attenuated total reflection
- ATR
- internal reflection spectroscopy
- spatial resolution
- polymer analysis
- skin imaging
- POLYMERS
- RAMAN
- ORIENTATION