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12
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0000961709
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D. W. Bassett and D. R. Rice, in The Physical Basis for Heterogeneous Catalysis, edited by E. Drauglis and R. I. Jaffee (Plenum, New York, 1975), p. 231, estimate Es for W, Ir, and Re dimers on W(110) to be 0.32, 0.17, and 0.0 eV, respectively, compared to cohesive energies of 2.16, 1.16, and 1.36 eV per nearest-neighbor bond in bulk W, Ir, and Re. Tsong and Casanova, in Ref. 1, find Es= 0.082 eV for an Ir dimer on W(110), report Es = 0.285 eV for W dimers on W(110).
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(1980)
and in Phys. Rev. B
, vol.21
, pp. 4564
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13
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84926791759
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The only explanation of the smallness of values of Es that I have found in the literature, by, is that ``the more strongly the adatom is bound to the substrate the less it is disposed to interact with another adatom.'' This statement is true, and perhaps helps one understand why the Ir-Ir separation energy on W is lower than the Ir—Ir bond strength in bulk Ir. But it does not elucidate the comparably small W-W adatom separation energy on W(110). Elaborate Anderson-Hamiltonian model calculations by, 58, 349, have produced values of Es several times larger than experiment., N. R. Burke, Surf. Sci.
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(1976)
Colloq.
, vol.41
, pp. C3-C243
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Desjonqueres, M.C.1
Phys. (Paris), J.2
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15
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84926852560
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and 33, 719 (1986), J. Chem. Phys., 81, 5864
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(1984)
and Phys. Rev. Lett.
, vol.54
, pp. 2627
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20
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84910583806
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Theoretical considerations of energetics, dynamics, and structure at interfaces
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The generality of the significance of a dimer's preferred bond length is questioned by, They show that rapid dimer diffusion can be the result of strong energy exchange between dimer libration and substrate vibration modes.
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(1985)
Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films
, vol.3
, pp. 1574
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Landman, U.1
Barnett, R.N.2
Cleveland, C.L.3
Rast, R.H.4
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22
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84926823293
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As an Al cluster grows, it seems reasonable to give the electrons above it the same variational freedom as is available to electrons above clean portions of the substrate. The inclusion of floating orbitals above Al adatoms increases the calculated Al binding energy to the surface by about 50 meV without changing the shape of the binding curve appreciably.
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28
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84926801510
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Of course the floating orbitals atop the surface Al's are included too.
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