Proceedings of the Korean Vacuum Society Conference (한국진공학회:학술대회논문집)

The Korean Vacuum Society (한국진공학회)
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Acidic Water Monolayer on Ru(0001)

  • Kim, Youngsoon (Surface Science Laboratory, Seoul National University) ;
  • Moon, Eui-Seong (Surface Science Laboratory, Seoul National University) ;
  • Shin, Sunghwan (Surface Science Laboratory, Seoul National University) ;
  • Yi, Seung-Hoon (Surface Science Laboratory, Seoul National University) ;
  • Kang, Heon (Surface Science Laboratory, Seoul National University)
  • Published : 2013.02.18
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Abstract

Water molecules on a Ru(0001) surface are anomalously acidic compared to bulk water. The observation was made by conducting reactive ion scattering, reflection absorption infrared spectroscopy, and temperature-programmed desorption measurements for the adsorption of ammonia onto a water layer formed on Ru(0001). The study shows that the water molecules in the first intact $H_2O$ bilayer spontaneously release a proton to NH3 adsorbates to produce $NH_4{^+}$. However, such proton transfer does not occur for $H_2O$, OH, and H in a mixed adsorption layer or for $H_2O$ in a thick ice film surface.

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