Preferential sub-surface occupation of atomic hydrogen on Cu(111)

Luo, Meng Fan; MacLaren, Donald A.; Shuttleworth, I.G.; Allison, W.

doi:10.1016/j.cplett.2003.09.154

Cited by 25 publications

(18 citation statements)

References 21 publications

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“…The probable arrangement is the formation of sub-surface hydrogen. A similar conclusion has been reported by Luo et al 12,14 Based on helium atom scattering, an experimental technique of exclusive surface sensitivity, and TPD data, these authors have shown that hydrogen disappears from the surface between 180 and 250 K, i.e., before the onset of the desorption from the β-state observed with TPD at 300 K. Based on their data, these authors found that hydrogen adsorbed on the surface is thermodynamically not stable at 210-245 K, and conclude that H atoms are transported from the surface to sub-surface sites by an activated process.…”

Section: Thermal Desorptionsupporting

confidence: 80%

“…The α 2 -state, which did not saturate, exhibited zero-order kinetics and was assigned to hydrogen absorbed in the bulk. A different assignment for the β-state has been suggested by Luo et al 12,14 Based on HAS experiments discussed in detail below, these authors found that surface hydrogen is not stable at low coverage and higher temperature (>200 K), which lead them to conclude that the β-state is not due to desorption of surface hydrogen, but to first-order desorption from sub-surface hydrogen.…”

Section: Thermal Desorptionmentioning

confidence: 99%

“…The study of sub-surface hydrogen is an active field, and it is been carried on a number of transition metals. 7,12,14,19,25,26,[31][32][33][34][35][36][37] For copper, and in particular on Cu(111), the role of sub-surface hydrogen is still not well understood. 12,14 Even though an early photoemission study by Plummer and Greuter 11 tentatively suggested that the binding energy of sub-surface sites is more favorable than that of surface sites, their subsequent electron energy loss spectroscopy study 9 did not show evidence for the presence of a) Author to whom correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, Luo et al assigned the β feature to subsurface hydrogen and the α to bulk hydrogen, based on the results from helium atom scattering (HAS) experiments. 12 Since helium atoms scatter of surfaces only, this method is extremely surface sensitive. They concluded that sub-surface absorption of hydrogen on Cu(111) is energetically favored in the limit of zero coverage and without surface reconstruction.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of hydrogen on the surface and sub-surface of Cu(111)

Mudiyanselage

Yang

Hoffmann

et al. 2013

The Journal of Chemical Physics

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Articles you may be interested in 1,2-Dibromoethane on Cu(100): Bonding structure and transformation to C2H4 J. Chem. Phys. 135, 064706 (2011) The interaction of atomic hydrogen with the Cu(111) surface was studied by a combined experimental-theoretical approach, using infrared reflection absorption spectroscopy, temperature programmed desorption, and density functional theory (DFT). Adsorption of atomic hydrogen at 160 K is characterized by an anti-absorption mode at 754 cm −1 and a broadband absorption in the IRRA spectra, related to adsorption of hydrogen on three-fold hollow surface sites and sub-surface sites, and the appearance of a sharp vibrational band at 1151 cm −1 at high coverage, which is also associated with hydrogen adsorption on the surface. Annealing the hydrogen covered surface up to 200 K results in the disappearance of this vibrational band. Thermal desorption is characterized by a single feature at ∼295 K, with the leading edge at ∼250 K. The disappearance of the sharp Cu-H vibrational band suggests that with increasing temperature the surface hydrogen migrates to sub-surface sites prior to desorption from the surface. The presence of sub-surface hydrogen after annealing to 200 K is further demonstrated by using CO as a surface probe. Changes in the Cu-H vibration intensity are observed when cooling the adsorbed hydrogen at 180 K to 110 K, implying the migration of hydrogen. DFT calculations show that the most stable position for hydrogen adsorption on Cu(111) is on hollow surface sites, but that hydrogen can be trapped in the second sub-surface layer. © 2013 AIP Publishing LLC. [http://dx

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Section: Thermal Desorptionsupporting

confidence: 80%

Section: Thermal Desorptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Adsorption of hydrogen on the surface and sub-surface of Cu(111)

Mudiyanselage

Yang

Hoffmann

et al. 2013

The Journal of Chemical Physics

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“…13 Although TPD and MBS have been previously reported with the same detector, it has been at the expense of resolution. 14,15 This has led to systems being designed either for MBS or TPD or having separate chambers for TPD and MBS. This note describes an instrument that allows TPD and high resolution MBS to be performed with the same mass spectrometer, in which the spectrometer can be moved along both the polar and radial axes and the width of the entrance aperture varied.…”

mentioning

confidence: 99%

Note: A versatile mass spectrometer chamber for molecular beam and temperature programmed desorption experiments

Tonks

Galloway

King

et al. 2016

Review of Scientific Instruments

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A dual purpose mass spectrometer chamber capable of performing molecular beam scattering (MBS) and temperature programmed desorption (TPD) is detailed. Two simple features of this design allow it to perform these techniques. First, the diameter of entrance aperture to the mass spectrometer can be varied to maximize signal for TPD or to maximize angular resolution for MBS. Second, the mass spectrometer chamber can be radially translated so that it can be positioned close to the sample to maximize signal or far from the sample to maximize angular resolution. The performance of this system is described and compares well with systems designed for only one of these techniques

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Tilt the Molecule and Change the Chemistry: Mechanism of S‐Promoted Chemoselective Catalytic Hydrogenation of Crotonaldehyde on Cu(111)

Chiu¹,

Watson²,

Kyriakou³

et al. 2006

Angewandte Chemie

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The chemoselective hydrogenation of a,b-unsaturated carbonyl compounds to form unsaturated alcohols is challenging, fundamentally interesting, and important both in the research laboratory and on a technical scale, as these materials are valuable and versatile intermediates in the production of fine chemicals and pharmaceuticals. Thermodynamics favors hydrogenation of the C=C bond to form the (unwanted) saturated aldehyde or ketone as shown in Scheme 1, which refers to the particular case of crotonaldehyde. Thus chemoselective C = O hydrogenation is a demanding process that requires the manipulation of kinetic effects by means of a suitable catalyst.A variety of supported metal-particle catalysts (including Pt, Pd, Cu, Ag, Au, Ir, and Os) that exhibit a wide range of chemoselectivity have been investigated for this purpose, [1] though very little has emerged in terms of fundamental understanding. Theoretical studies [2] suggest that the adsorption geometry of the reactant molecule may be a key Scheme 1. Possible hydrogenation products of crotonaldehyde.

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Preferential sub-surface occupation of atomic hydrogen on Cu(111)

Cited by 25 publications

References 21 publications

Adsorption of hydrogen on the surface and sub-surface of Cu(111)

Adsorption of hydrogen on the surface and sub-surface of Cu(111)

Note: A versatile mass spectrometer chamber for molecular beam and temperature programmed desorption experiments

Tilt the Molecule and Change the Chemistry: Mechanism of S‐Promoted Chemoselective Catalytic Hydrogenation of Crotonaldehyde on Cu(111)

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