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Title: Ultrafast molecular transport on carbon surfaces: The diffusion of ammonia on graphite

Journal Article · · Carbon
ORCiD logo [1];  [2];  [3];  [4];  [4];  [1];  [4]
  1. Graz Univ. of Technology (Austria)
  2. Univ. of Surrey, Guildford (United Kingdom)
  3. Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Cambridge (United Kingdom). Cavendish Lab.
  4. Inst. Laue-Langevin (ILL), Grenoble (France)

We present a combined experimental and theoretical study of the self-diffusion of ammonia on exfoliated graphite. Using neutron time-of-flight spectroscopy we are able to resolve the ultrafast diffusion process of adsorbed ammonia, NH3, on graphite. Together with van der Waals corrected density functional theory calculations we show that the diffusion of NH3 follows a hopping motion on a weakly corrugated potential energy surface with an activation energy of about 4 meV which is particularly low for this type of diffusive motion. The hopping motion includes further a significant number of long jumps and the diffusion constant of ammonia adsorbed on graphite is determined with D = 3.9•10-8 m2/s at 94 K.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
Engineering and Physical Sciences Research Council (EPSRC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1476645
Journal Information:
Carbon, Journal Name: Carbon Journal Issue: C Vol. 126; ISSN 0008-6223
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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