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Sensitivity improvement in surface infrared spectroscopy: Design, characteristics, and application of a high-temperature graphite source

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3 Author(s)
Herceg, Eldad ; Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607-7061 ; Celio, Hugo ; Trenary, Michael

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An infrared source designed to increase the sensitivity of the technique of reflection absorption infrared spectroscopy (RAIRS) for the detection of molecular adsorbates at submonolayer coverages on metal surfaces is described. The source is based on a graphite element with a lifetime of 500 h when operated at a temperature of ∼2300 K in a static pressure of 800 Torr of argon. The design allows for rapid and easy replacement of the low cost graphite element. The signal-to-noise ratio (SNR) achieved with this source for spectra obtained with both mercury cadmium telluride and indium antimonide detectors is a factor of 3-higher than obtained with a standard silicon carbide (SiC) source operated at ∼1500 K. With the higher SNR available with the graphite source it was possible to detect two vibrational features, δs(CH3) of methyl at 1247 cm–1, and ν(CH) of methylidyne at 2956 cm–1, that were not detected in previous RAIRS studies.

Published in:

Review of Scientific Instruments  (Volume:75 ,  Issue: 8 )