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Review of Scientific Instruments / Volume 75 / Issue 8 / ARTICLES / CONDENSED MATTER; MATERIALS

Rev. Sci. Instrum. 75, 2545 (2004); http://dx.doi.org/10.1063/1.1771500 (6 pages)

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

Eldad Herceg, Hugo Celio, and Michael Trenary

Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607-7061

(Received 9 March 2004; accepted 30 April 2004; published online 26 July 2004)

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.

© 2004 American Institute of Physics

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KEYWORDS and PACS

Keywords

graphite, organic compounds, indium compounds, platinum, III-V semiconductors, infrared spectroscopy, infrared sources, infrared detectors, adsorption, surface chemistry, infrared spectra

PACS

  • 07.57.Ty

    Infrared spectrometers, auxiliary equipment, and techniques

  • 07.57.Hm

    Infrared, submillimeter wave, microwave, and radiowave sources

  • 07.57.Kp

    Bolometers; infrared, submillimeter wave, microwave, and radiowave receivers and detectors

  • 85.60.Gz

    Photodetectors (including infrared and CCD detectors)

  • 68.43.Mn

    Adsorption kinetics

  • 78.30.Hv

    Other nonmetallic inorganics

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1771500

PUBLICATION DATA

ISSN

0034-6748 (print)  
1089-7623 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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