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J. Chem. Phys. 126, 234708 (2007). 
"Direct observation of hydrogen-bond exchange within a single water dimer"
Phys. Rev. Lett. 100, 166101 (2008).
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Phys. Rev. B 79, 035423 (2009).
 "Symmetric hydrogen bond in a water-hydroxyl complex on Cu(110)"
Phys. Rev. B 81, 045402 (2010).