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• W4239968244 abstract "The reconstruction exhibited by clean Pt(100) surfaces [(5 × 20) LEED pattern] is removed by the adsorption of CO. Rutherford backscattering (RBS) indicates that 1.65 ± 0.05 × 1015 Pt atoms cm−2 move into registry with the bulk upon adsorption of 6.4 ± 0.4 × 1014 CO molecules cm−2 (θ = 0.50 ± 0.03 monolayers). The data indicate that some atoms in the second and perhaps even subsequent layers must be displaced by ≳0.01 nm in the reconstructed surface. By contrast, only 1.3 ± 0.1 × 1015 Pt atoms cm−2 move back into registry upon adsorption of H2 or D2, and the LEED pattern also indicates that residual reconstruction remains. The stability of the CO-covered, H-covered and “almost clean” (1 × 1) surfaces (the latter prepared by NO and H2 treatments with a residual H-coverage of ∼1 × 1014 H atoms cm−2) was investigated by RBS. The CO-covered surface starts to reconstruct only when the CO coverage drops below 0.5 monolayers (T ≳ 450 K) while the H-covered surface (produced by adsorption on the (5 × 20) surface) reconstructs rapidly at T ≳ 350 K, by which temperature the adsorbed hydrogen coverage drops below ∼0.2 monolayers. The “almost clean” surface reconstructs at T ≳ 390 K and the data indicate that the process exhibits an activation energy of 88 ± 17 kJ mol−1. The absolute coverages of CO and D were determined by nuclear microanalysis (NMA) and excellent agreement was achieved between the LEED and NMA data. The saturation CO coverage was found to be 0.77 ± 0.03 monolayers, consistent with the observed c(4 × 2) LEED pattern. Deuterium (and hence hydrogen) coverages of 1.54 ± 0.1 × 1015 D (H) atoms cm−2 (θ = 1.20 ± 0.08) were found at saturation at ∼150 K and the hydrogen adsorbed on the (1 × 1) surface was more strongly bound than that resulting from adsorption on the (5 × 20) surface." @default.
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• W4239968244 date "1981-07-01" @default.
• W4239968244 modified "2023-09-25" @default.
• W4239968244 title "The pt(100) (5 × 20) ⇋ (1 × 1) phase transition: A study by Rutherford backscattering, nuclear microanalysis, LEED and thermal desorption spectroscopy" @default.
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• W4239968244 doi "https://doi.org/10.1016/0039-6028(81)90445-3" @default.
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