Citation: Xiang Qin Lin, Zhi Xiang Zhang, Wan Qun Hu. Concave cell design for FTIR measurements[J]. Chinese Chemical Letters, ;2011, 22(11): 1339-1342. doi: 10.1016/j.cclet.2011.05.038 shu

Concave cell design for FTIR measurements

Department of Chemistry, University of Science and Technology of China, Hefei 230026, China

Received Date: 10 March 2011

Wedged and V-shaped cells have advantages on depressing strong absorption bands and keeping the photo windows wide open without absorption block. Alternatively, this work presents a concave cell design, which is constructed by a plano-convex CaF₂ lens in combination with a flat plate. Mathematical equations have been provided for data treatment with Matlab programs. The result indicates that the concave cell has advantages similar to the V-shaped cell. Reflection-absorption measurements of ethanol have been conducted on the cell in mid-IR region for demonstration. The spectrum obtained from the concave cell can easily be interpreted to regenerate its normal spectrum, which is fitting well with the spectrum taken in a conventional thin-layer cell. The concave cell is easier to construct and more convenient to operate, willing to have popular usages.
- Infrared,
- Concave,
- Spectroscopic cell,
- Reflection-absorption,
- Ethanol
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