TY - JOUR
T1 - Oscillatory adatom-adatom interactions of Pd adatoms on the W(2 1 1) surface
AU - Fu, Tsu Yi
AU - Hwang, Yi Ju
AU - Tsong, Tien T.
N1 - Funding Information:
This research is supported by the National Science Council of ROC under the Grant: NSC 91-2112-M-003-026 and the National Taiwan Normal University under the Grant: ORD 92-3.
PY - 2004/9/20
Y1 - 2004/9/20
N2 - Direct observations with the field ion microscope make it possible to determine the probability P(R) of finding two atoms on a surface at a separation R at equilibrium at temperature T. The free energy of interaction F(R) can be obtained from the relation: P(R) ∝ exp[-F(R)/kT]. On the W(211) plane, the interactions of two Pd atoms are studied for following cases: two Pd atoms in the same, in the nearest, the second-nearest and the third-nearest neighbor channels. When two Pd atoms are in the same channel, they combine easily to form a dimer of bond length 2.74 Å and the dimer can diffuse along the channel. Oscillatory behaviors of these interactions along the channel direction are observed. The further are the channels separated, the smaller is the maximum interaction energy. The maximum attractive energy in the same, nearest, second-nearest and third-nearest neighbor channel separations are 33.1, 23.0, 7.8, and 7.1 meV, respectively.
AB - Direct observations with the field ion microscope make it possible to determine the probability P(R) of finding two atoms on a surface at a separation R at equilibrium at temperature T. The free energy of interaction F(R) can be obtained from the relation: P(R) ∝ exp[-F(R)/kT]. On the W(211) plane, the interactions of two Pd atoms are studied for following cases: two Pd atoms in the same, in the nearest, the second-nearest and the third-nearest neighbor channels. When two Pd atoms are in the same channel, they combine easily to form a dimer of bond length 2.74 Å and the dimer can diffuse along the channel. Oscillatory behaviors of these interactions along the channel direction are observed. The further are the channels separated, the smaller is the maximum interaction energy. The maximum attractive energy in the same, nearest, second-nearest and third-nearest neighbor channel separations are 33.1, 23.0, 7.8, and 7.1 meV, respectively.
KW - Adatoms
KW - Field ion microscopy
KW - Palladium
KW - Tungsten
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U2 - 10.1016/j.susc.2004.05.086
DO - 10.1016/j.susc.2004.05.086
M3 - Conference article
AN - SCOPUS:4544233634
SN - 0039-6028
VL - 566-568
SP - 462
EP - 466
JO - Surface Science
JF - Surface Science
IS - 1-3 PART 1
T2 - Proceedings of the 22nd European Conference on Surface Science
Y2 - 7 September 2003 through 12 September 2003
ER -