TY - JOUR
T1 - Diffusion of potassium on Re(001) investigated by coverage grating-optical second-harmonic diffraction
AU - Zhao, W.
AU - Verhoef, R. W.
AU - Asscher, M.
PY - 1997/10/8
Y1 - 1997/10/8
N2 - Using the coverage grating-optical second-harmonic diffraction method, we have measured the diffusion rate of potassium on Re(001) in the coverage range of 0.6-1 ML. We observe a minimum in both the activation energy for diffusion and the diffusion preexponential at an initial potassium coverage of 0.75 ML. For potassium coverages of 0.93. 0.84. 0.73. and 0.59 ML, the activation energies for diffusion are determined to be 5.0±0.2, 3.9±0.7, 3.6±0.2, and 5.0±1.0 kcal/mol, and D0 is 5.6×10-3±0.3, 3.5×10-4±1.1, 5.8×10-4±0.3, and 3.7×10-1±1.9 cm2/s, respectively. The results are discussed in terms of electrostatic dipole-dipole repulsive interactions among neighboring adsorbates.
AB - Using the coverage grating-optical second-harmonic diffraction method, we have measured the diffusion rate of potassium on Re(001) in the coverage range of 0.6-1 ML. We observe a minimum in both the activation energy for diffusion and the diffusion preexponential at an initial potassium coverage of 0.75 ML. For potassium coverages of 0.93. 0.84. 0.73. and 0.59 ML, the activation energies for diffusion are determined to be 5.0±0.2, 3.9±0.7, 3.6±0.2, and 5.0±1.0 kcal/mol, and D0 is 5.6×10-3±0.3, 3.5×10-4±1.1, 5.8×10-4±0.3, and 3.7×10-1±1.9 cm2/s, respectively. The results are discussed in terms of electrostatic dipole-dipole repulsive interactions among neighboring adsorbates.
UR - http://www.scopus.com/inward/record.url?scp=0001098038&partnerID=8YFLogxK
U2 - 10.1063/1.474231
DO - 10.1063/1.474231
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AN - SCOPUS:0001098038
SN - 0021-9606
VL - 107
SP - 5554
EP - 5560
JO - Journal of Chemical Physics
JF - Journal of Chemical Physics
IS - 14
ER -