We report the use of infrared spectroscopy to unambiguously identify the gaseous reaction products evolved during the course of a surface reaction under ultrahigh vacuum conditions. The apparatus consists of two independent, liquid-nitrogen-cooled samples; one is used to trap the gaseous products generated by reaction on the surface of interest. The trapped products are subsequently identified using surface infrared spectroscopy. We demonstrate the utility of this product trapping infrared reflection absorption spectroscopy technique, for the separation of isomers of butene, which are indistinguishable using conventional mass spectrometry, as well as the identification of radical species, such as ⋅CH3, which are important in diamond growth.
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Weldon et al. (1995) studied this question.
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