Ammonia adsorption on and diffusion into thin ice films grown on Pt(111)

The Journal of Chemical Physics
T TakaokaT Komeda

Abstract

Ammonia adsorption on and diffusion into thin ice films grown on a Pt(111) surface were studied using Fourier transform infrared spectroscopy (FTIR) and thermal desorption spectroscopy. After exposing the crystalline ice film to ammonia molecules at 45 K (ammonia/ice film), we have detected an intriguing feature at 1470 cm(-1) in the FTIR spectra, which is derived from the adsorption of ammonia on the ice with a characteristic structure which appears in thin film range. The peak intensity of this feature decreases gradually as the thickness of the substrate ice increases. In addition, we have detected a feature at 1260 cm(-1) which appears after annealing the ammonia/ice film. The feature corresponds to the ammonia molecules which reach the ice/Pt(111) interface through the ice film. Intriguingly, the intensity of this feature decreases with the ice thickness and there is a linear relation of the peak intensity of the features at 1470 and 1260 cm(-1). We propose a model in which the solubility of the ammonia molecules is much higher for the thin ice film than that for the ideal ice.

References

Jul 22, 1996·Physical Review Letters·M MorgensternG Comsa
Aug 13, 2002·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Peter L DaviesVirginia K Walker
Aug 31, 2002·Science·Florent Dominé, Paul B Shepson
Oct 26, 2002·Physical Review Letters·Sheng MengShiwu Gao
Jan 7, 2003·Physical Review Letters·H OgasawaraA Nilsson

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Citations

May 15, 2015·Angewandte Chemie·Youngsoon KimHeon Kang
Oct 23, 2020·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Nathaniel L KitzmillerHenry F Schaefer
Apr 9, 2013·Journal of Chemical Theory and Computation·Esam A Orabi, Guillaume Lamoureux

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