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Hydrogen bonds directly detected for the first time. May 12, 2017
https://m.phys.org/news/2017-05-hydrogen-bonds.html
Shigeki Kawai, Tomohiko Nishiuchi, et al. Direct quantitative measurement of the C═O⋅⋅⋅H–C bond by atomic force microscopy. Science Advances. 12 May 2017:Vol. 3, no. 5, e1603258 DOI: 10.1126/sciadv.1603258