The interaction of atomic hydrogen with Cu(110)

Sandl, P.; Bischler, U.; Bertel, E.

doi:10.1016/0039-6028(93)91473-3

Cited by 35 publications

(11 citation statements)

References 35 publications

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“…As observed by Sun et al [7] and in good agreement with those results, the 2 eV peak, ascribed to surface state transitions in clean Cu(110), is found to decrease strongly nonlinearly at low coverages. The same feature is also observed in other systems [5,6,12,13] adsorbed on Cu(110). We also show that CO adsorption affects profoundly the dynamics of the optical transitions with respect to the clean surface in the whole RA spectrum (0-6 eV).…”

supporting

confidence: 80%

“…Experimental studies of 3-thyophene carboxilate [5] and 9-anthracene carboxylic acid [6] on Cu(110) show the evolution of the 2 eV RA peak upon coverage, from the clean surface to the p2 1, similar to that of CO=Cu110 described here. Previously, a very exhaustive photoemission study on H=Cu110 [13] showed that the progressive quenching of surface states intensity upon coverage is nonlinear, as proposed for CO=Cu110. On the other hand, Jin et al [10] observed a linear behavior in the RA evolution with coverage in different thermal conditions.…”

mentioning

confidence: 96%

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Optical Response of the Copper Surface to Carbon Monoxide Deposition

Monachesi

Chiodo

2004

Phys. Rev. Lett.

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The optical response of the Cu surface upon CO deposition is investigated from the clean Cu(110) to the reconstructed CO/Cu(110)-p(2x1) geometry through ab initio electronic structure calculations. We ascribe the relevant structures in the calculated reflectance anisotropy spectrum of the reconstructed phase to the persistence of surface states transitions. These are excited by light polarized along the direction perpendicular to the one found at the clean surface. We devise a simple model for the evolution of the optical response in the adsorption process, identifying three different regimes. The impurity regime, at very low coverages, is characterized by a critical coverage that enhances the actual one by a factor of approximately 30, close to the value estimated experimentally.

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supporting

confidence: 80%

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confidence: 96%

Optical Response of the Copper Surface to Carbon Monoxide Deposition

Monachesi

Chiodo

2004

Phys. Rev. Lett.

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“…By analogy, we, too, assign the low temperature TDS peak to a subsurface H species. This assignment is supported by our inverse photoemis- sion data [14,15]: On Cu(l 10) the unoccupied Shockley surface state at the Y point of the surface Brillouin zone [15,16] survives up to 0\\ =0.45, but disappears completely as the population of the low temperature TDS state is increased. In contrast, on Ni(110) the unoccupied Shockley surface state [14] survives the adsorption of H2 at low temperatures up to H coverages of 0H = 1.5.…”

Section: Sticking Adsorption and Absorption Of Atomic H On Cu(110)mentioning

confidence: 55%

“…The difference of the TDS spectra in the temperature range between 250 and 300 K is due to an irreversible phase transition, i.e., the missing/added row reconstruction taking place on H/Cu(l 10). This is discussed in more detail in [15] and references therein.…”

Section: Sticking Adsorption and Absorption Of Atomic H On Cu(110)mentioning

confidence: 97%

Sticking, adsorption, and absorption of atomic H on Cu(110)

et al. 1993

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The sticking coefficient of atomic hydrogen at T G = 1815 K on a Cu(l 10) surface has been determined to be 18%. In addition to the buildup of a chemisorption layer the absorption of atomic H into subsurface sites is observed. The subsurface sites are thermally less stable than the chemisorption sites. Model calculations for the phononic energy transfer and estimates for the parallel momentum transfer as well as for electron-hole pair excitation indicate that the first two mechanisms dominate the accommodation process.

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“…Desorption of hydrogen from Cu surfaces occurs at a variety of temperatures depending on the surface termination. For example, hydrogen desorbs from Cu{1 1 1} below room temperature and has even been found to be stable in subsurface regions as well as desorb from Cu{1 1 0} at 330 K [37][38][39]. No desorption data are available for hydrogen on Cu{5 3 1} but the fact that it is significantly more atomically rough than Cu{1 1 0} suggests that the desorption temperature is higher than 330 K. For the example of oxygen on Pt{5 3 1}, the desorption temperatures for oxygen are approximately 15% higher than for Pt{1 1 0} [40], while similar increases are observed for CO and oxygen on Cu{5 3 1} [41].…”

Section: Xpsmentioning

confidence: 98%