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6526 J. Phys. Chem. 1987, 91, 6526-6532 Diode Laser-Waveguide Spectroscopy in Solid Argon Slabs
 

Summary: 6526 J. Phys. Chem. 1987, 91, 6526-6532
Diode Laser-Waveguide Spectroscopy in Solid Argon Slabs
John Kbademi, Mark Fisher, Bill Kapelle, and V. A. Apkarian*
Department of Chemistry, University of California, Irvine, California 92717 (Received: June 26, 1987)
It is possibleto deposit high-qualityargon filmson metal surfacesto beused as thin dielectricslab waveguides. The combination
of diode lasers with argon waveguides representsa convenient spectroscopictechniqueof high sensitivityand resolution,ideally
suited for vibrational spectroscopyof adsorbates. In a first-generation waveguideassembly we demonstrate the single-mode
guiding properties of argon slabs deposited on copper mirrors. The utility of the technique is demonstrated by recording
absorptionspectra of CH3Fmoleculesdoped in the guide. A comparison between spectraobtained by reflection versus transverse
magnetic guided waves is made to illustrate the salient features of this technique.
I. Introduction
Rare gas films deposited on metal mirrors constitute classical
dielectric slab waveguides. This was recognized by Rossetti and
Brus, who demonstrated that, by taking advantage of waveguiding
in thick rare gas slabs, enhanced sensitivities in optical absorption
and scattering spectroscopies of matrix-isolated species could be
derived. Bondybey and co-workers subsequently applied this
technique in UV-vis absorption spectroscopy of matrix-isolated
ionic specie^.^,^ In this paper we consider the characteristics of
thin argon slabs as infrared waveguides both theoretically and

  

Source: Apkarian, V. Ara - Department of Chemistry, University of California, Irvine

 

Collections: Chemistry