Tunneling Diffusion of Excess Protons in Amorphous Solid Water at 10 and 80 K
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- Tunneling Diffusion of Excess Protons in Amorphous Solid Water at 10 and 80 K
- Other Titles
- 10 K와 80 K에서 비결정성 얼음 내 초과 양성자의 터널링 확산
- Issue Date
- 이두형, 강한이, 강헌. 2019. "Tunneling Diffusion of Excess Protons in Amorphous Solid Water at 10 and 80 K". JOURNAL OF PHYSICAL CHEMISTRY C, 123(6): 3657-3663.
- This work explores the plausibility of quantum tunneling of excess protons in amorphous solid water (ASW) at temperatures as low as 10 K. The transport of protons from a proton donor (HCl) to an acceptor (NH3) species located at a controlled separation distance in an ASW film was investigated at 10 K and 80 K. The proton transfer efficiency was measured by quantitation of the yield of ammonium ions using reflection-absorption infrared spectroscopy. The average transport distance of excess protons in the ASW films was ~10 water molecules in the temperature range of 10-80 K and showed no noticeable dependence on the temperature. On the other hand, the transport of protons along the surface of ASW film was restricted to within a range of two water molecules at 10 K because of an energy barrier. The mobility of excess protons in the interior of ASW at temperatures close to 10 K indicated quantum tunneling of protons, most likely in the microscopic crystalline regions of the ASW samples.
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