LEED studies of the adsorption of CO2 on thin epitaxial NaCl(100) films

Schimmelpfennig, J.; Fölsch, Stefan; Henzler, M.

doi:10.1016/0039-6028(91)90722-5

Cited by 46 publications

(5 citation statements)

References 12 publications

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“…For example, the HAS angular distributions from the NaCl films exhibit significantly lower diffraction peak intensities as well as higher background intensity levels for any mode of film preparation ͑different crystal temperatures during the film deposition, different annealing time, and temperatures, etc.͒. Although, earlier experiments with other adsorbates showed good agreement between the HAS and the LEED data 18,57 we conjecture that the situation may differ for water, since water adsorption on surfaces is anticipated to depend strongly on the defect structure of the substrate. For example, in related experiments on water adsorption on the Cu͑111͒ surface Hinch and Dubois 58 demonstrated that two phases of water ͑metastable and stable͒ can be formed depending on the defect concentration consisting of steps or contaminants.…”

Section: ͑3͒mentioning

confidence: 94%

A helium atom scattering study of water adsorption on the NaCl(100) single crystal surface

Bruch¹,

Glebov²,

Toennies³

et al. 1995

The Journal of Chemical Physics

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A helium atom scattering study of the structure and dynamics of a Xe monolayer on NaCl(001) Structural and dynamic properties of H 2 O adsorbed on an in situ cleaved NaCl͑100͒ crystal surface were studied by He atom scattering in the range of temperatures and partial pressures of 80-160 K and 5ϫ10 Ϫ7 -5ϫ10 Ϫ10 mbar, respectively. A well-ordered 2D H 2 O layer was formed during adsorption as well as by heating of 3D ice. The isosteric heat of adsorption in the monolayer regime was found to be in the range 58 -63 kJ/mol. The structure of the 2D condensed phase was investigated for both modes of preparation and in both cases a ͑1ϫ1͒ diffraction pattern was found. Time-of-flight spectra of the monolayer H 2 O/NaCl were measured in the ͗100͘ direction and phonon dispersion curves were determined. The observed dispersion-free vibrational mode, with បϭ5.5 meV, was identified as a frustrated translation of the water molecule parallel to the surface, via calculations for physisorption models of the H 2 O/NaCl interaction. Other salient features of the adsorption, the large heat of adsorption, and the magnitude of the frequency of molecular vibration perpendicular to the substrate, are reproduced in the calculations.

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Section: ͑3͒mentioning

confidence: 94%

A helium atom scattering study of water adsorption on the NaCl(100) single crystal surface

Bruch¹,

Glebov²,

Toennies³

et al. 1995

The Journal of Chemical Physics

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“…The structure of CO 2 thin films on the NaCl(001) substrate has been studied extensively using IR absorption, − low-energy electron diffraction (LEED), and helium atom scattering (HAS) techniques. The LEED and HAS studies concluded the formation of commensurate monolayer with a (2 × 1) superstructure, whereas the possibility of the 2D-lattice gas, equilibrating with the ordered 2D solid, is also suggested in the submonolayer-coverage regime .…”

Section: Introductionmentioning

confidence: 99%

Glass−Liquid Transition of Carbon Dioxide and Its Effect on Water Segregation

Souda

2006

J. Phys. Chem. B

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The interactions between CO(2) and D(2)O molecules have been investigated by using time-of-flight secondary ion mass spectrometry in the temperature rage 13-120 K. The monolayer of CO(2) tends to wet or intermix with the D(2)O film below 40 K and dewets the surface above 60 K. The water nanoclusters deposited on the CO(2) multilayers also start to segregate at 50-60 K and are finally incorporated in the bulk at 85-90 K, where the morphology of the film changes abruptly together with the desorption rate of the CO(2) molecules. The break at 85 K should be caused by the occurrence of the fluidized film whereas the glass-transition temperature of CO(2), as determined from the onset of translational molecular diffusion, is assigned to 50 K. This behavior may be related to the ultraviscous nature of the supercooled liquid, arising from the decoupling between the translational molecular diffusion and viscosity. The He(+) irradiation of the mixed CO(2)-D(2)O ice and the D(2)(+) irradiation of the CO(2) ice at 13 K do not yield any surface residues assignable to H(2)CO(3) and its precursors above 100 K. This result may be related to the segregation between the CO(2) and D(2)O molecules.

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“…102 In this sense, the physisorption of simple molecules on ionic substrates is more amenable to a fundamental interpretation with present day theoretical modeling. 103 For CO 2 /NaCl(001), for example, both the structure and several characteristic vibrational frequencies have been described quite accurately by potential energy calculations of Heidberg et al 104 These results are in good agreement with structural studies based on LEED, 105 IRS 106 and helium diffraction. 107,108 A (2×1) superstructure with two CO 2 molecules per unit cell with a tilt angle θ ) 26°relative to the surface normal and an intermolecular azimuthal angle φ ) 86°is obtained.…”

Section: Co 2 /Naclmentioning

confidence: 77%