Fourier transform reflection infrared spectroscopy of adsorbed species: Instrumental considerations

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Abstract
An analysis of the factors limiting the sensitivity of Fourier Transform Infrared (FT–IR) spectroscopy as applied primarily to reflectance vibrational spectra of adsorbed species, but also to vibrational circular dichroism, is presented, along with methods of overcoming these. A particularly promising approach involves the use of a polarizing Michelson interferometer (PMI) and a multichannel detection system, a combination that should give a sensitivity improvement of at least tenfold over the best instruments currently available. An outline of a possible optical scheme for a high‐sensitivity FT–IR system for reflectance spectroscopy is given involving a PMI and orthogonal reflections from a test and reference surface.

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