A Fourier transform mass spectrometer for surface analysis by laser-induced thermal desorption of molecular adsorbates

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Abstract
A Fourier transform mass spectrometer (FTMS) for ultrahigh‐vacuum surface studies is described. The instrument incorporates standard surface analysis techniques such as Auger electron spectroscopy (AES), low‐energy electron diffraction (LEED), and Ar ion sputtering, along with laser‐induced thermal desorption (LITD) and thermal desorption spectroscopy (TDS) using FTMS detection, to perform surface analysis of metal samples. The manipulator allows temperature control of the samples between 110 and 1300 K. Using the LITD/FTMS surface reaction intermediates and kinetics are studied for the dehydrogenation of ethylene and cyclohexane on Pt(111). Relative sensitivities between AES and LITD/FTMS are discussed.