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2016
DOI: 10.1126/science.aaf2042
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Nuclear quantum effects of hydrogen bonds probed by tip-enhanced inelastic electron tunneling

Abstract: We report the quantitative assessment of nuclear quantum effects on the strength of a single hydrogen bond formed at a water-salt interface, using tip-enhanced inelastic electron tunneling spectroscopy based on a scanning tunneling microscope. The inelastic scattering cross section was resonantly enhanced by "gating" the frontier orbitals of water via a chlorine-terminated tip, so the hydrogen-bonding strength can be determined with high accuracy from the red shift in the oxygen-hydrogen stretching frequency o… Show more

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Cited by 138 publications
(100 citation statements)
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“…Consistent with earlier studies, a very high potential energy barrier of ∼3.6 eV is found for proton penetration of graphene via the chemisorption state. Using ab initio path-integral molecular dynamics (PIMD) [25][26][27][28][29][30][31], we take into account nuclear quantum effects (NQEs) and finite temperature thermal effects. We find that NQEs reduce the penetration barrier of graphene by 0.46 eV (12%) at 300 K, which is unlikely to be responsible for the experimentally observed high transfer rate.…”
mentioning
confidence: 99%
See 1 more Smart Citation
“…Consistent with earlier studies, a very high potential energy barrier of ∼3.6 eV is found for proton penetration of graphene via the chemisorption state. Using ab initio path-integral molecular dynamics (PIMD) [25][26][27][28][29][30][31], we take into account nuclear quantum effects (NQEs) and finite temperature thermal effects. We find that NQEs reduce the penetration barrier of graphene by 0.46 eV (12%) at 300 K, which is unlikely to be responsible for the experimentally observed high transfer rate.…”
mentioning
confidence: 99%
“…Our DFT calculations were performed using the Vienna ab initio Simulation Package (VASP) [32], with an in house implementation of the ab initio constrainedcentroid MD/PIMD methods [28,33]. The optB88-vdW functional was chosen in the electronic structure calculations so as to obtain a good description of the hydrogen (H)-bonding interactions and dispersion forces [34,35].…”
mentioning
confidence: 99%
“…[37] Werden weniger verzerrte Bilder gewünscht, kann man die Spitze auch anders funktionalisieren, z. [34,35,[41][42][43][44][45] Bislang wurden viele ganz unterschiedliche Funktionalisierungen der Messspitze fürdie AFM-Bildgebung erkundet, darunter die folgenden:1 )Funktionalisierung mit Metallatomen wie Cu, Ag und Au.H ierfürw urde entweder die Spitze in ein Metallsubstrat eingetaucht oder es wurden einzelne Metall-Adatome auf einem NaCl-Film aufgehoben. [38] Bindungsartige Kontraste an der Position von Wasserstoffbrücken wurden auch mit STM- [39] und AFM-Techniken [10,40] beobachtet.…”
Section: Methodsunclassified
“…Furthermore, some recent researches reveal that the core vibration of the protons in H-bond systems might have influences on the strength of H-bonds. The red-shift of the A-H covalent bond suggests the enhancement of the H-bond strength [132][133][134].…”
Section: Summerymentioning
confidence: 99%