Abstract
We measured the temperature and azimuthal dependence of the diffusion rates of hydrogen (1H) and deuterium (2H) on Ni(111) from 65 to 240 K where the diffusion rates vary by 8 orders of magnitude. The diffusion of hydrogen crosses over from an activated behavior above 110 K to another activated behavior below 110 K with a smaller activation energy. By ruling out the possibility of a step effect, we suggest that the crossover is from a classical overbarrier hopping to a quantum mechanical underbarrier tunneling.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 3696-3699 |
| Number of pages | 4 |
| Journal | Physical Review Letters |
| Volume | 79 |
| Issue number | 19 |
| State | Published - Nov 10 1997 |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Diffusion of hydrogen on Ni(111) over a wide range of temperature : Exploring quantum diffusion on metals. / Cao, G. X.; Nabighian, E.; Zhu, X. D.
In: Physical Review Letters, Vol. 79, No. 19, 10.11.1997, p. 3696-3699.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Diffusion of hydrogen on Ni(111) over a wide range of temperature
T2 - Exploring quantum diffusion on metals
AU - Cao, G. X.
AU - Nabighian, E.
AU - Zhu, X. D.
PY - 1997/11/10
Y1 - 1997/11/10
N2 - We measured the temperature and azimuthal dependence of the diffusion rates of hydrogen (1H) and deuterium (2H) on Ni(111) from 65 to 240 K where the diffusion rates vary by 8 orders of magnitude. The diffusion of hydrogen crosses over from an activated behavior above 110 K to another activated behavior below 110 K with a smaller activation energy. By ruling out the possibility of a step effect, we suggest that the crossover is from a classical overbarrier hopping to a quantum mechanical underbarrier tunneling.
AB - We measured the temperature and azimuthal dependence of the diffusion rates of hydrogen (1H) and deuterium (2H) on Ni(111) from 65 to 240 K where the diffusion rates vary by 8 orders of magnitude. The diffusion of hydrogen crosses over from an activated behavior above 110 K to another activated behavior below 110 K with a smaller activation energy. By ruling out the possibility of a step effect, we suggest that the crossover is from a classical overbarrier hopping to a quantum mechanical underbarrier tunneling.
UR - http://www.scopus.com/inward/record.url?scp=4244073748&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=4244073748&partnerID=8YFLogxK
M3 - Article
VL - 79
SP - 3696
EP - 3699
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 19
ER -