Prof. P. A. Christensen

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Updated: 28 Jan 09

The sensitivity of the Newcastle in-situ, variable temperature FTIR system

The sensitivity of the Newcastle in-situ FTIR spectroscopic system may be judged from the spectrum below, which shows CO adsorbed at a Ru(0001) electrode.

An in-situ FT-IR spectrum taken using the Newcastle system of CO adsorbed at the Ru(0001) electrode immersed in 0.1M HClO4. The spectrum comprised 16 co-added and averaged scans at 8 cm-1 resolution and was collected at 0.2V vs. Ag/AgCl
and normalized to the reference spectrum taken at -0.2 V.

The two bipolar bands in the figure, due to the potential-dependent shift in the frequencies of linearly adsorbed CO (COL, around 2000 cm-1) and CO adsorbed at a three-fold hollow site (COH, around 1780 cm-1), have excellent S/N, despite the spectrum comprising only 16 scans and requiring approximately 3s.

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