Monolayer structures of carbon monoxide adsorbed on sodium chloride: A helium atom diffraction study

Schmicker, D.; Toennies, J. P.; Vollmer, R.; Weiß, Helmut

doi:10.1063/1.461171

Cited by 83 publications

(34 citation statements)

References 19 publications

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“…3 Because of their neutrality and low collision energies ͑Ϸ20 meV͒, helium atoms have been used quite successfully in such studies as a scattering probe of surface structures and phonons. This has been demonstrated in our laboratory in a series of experiments employing both elastic and inelastic HAS to study adsorption of molecules ͑CO 2 , 4 H 2 O, 5-7 CO, 8,9 OCS 10 etc.͒ on the ͑001͒ surfaces of the insulators NaCl, MgO, and LiF. These HAS studies can provide information on the structural order and the vibrational degrees of freedom of the overlayer.…”

Section: Introductionmentioning

confidence: 94%

Two phases of acetylene adsorbed on NaCl(001) studied by high-resolution helium atom scattering

Glebov¹,

Miller²,

Toennies³

1997

The Journal of Chemical Physics

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Articles you may be interested inAtomic scattering from an adsorbed monolayer solid with a helium beam that penetrates to the substrate A helium atom scattering study of the structure and dynamics of a Xe monolayer on NaCl (001) Experimental and theoretical studies of the monolayer structure of OCS adsorbed on NaCl(001): Coexistence of orientationally inequivalent phases A helium atom scattering study of the growth and dynamics of CH 4 and C 2 H 6 on Cu (001) High-resolution helium atom scattering ͑HAS͒ has been used to identify two stable phases of acetylene physisorbed on NaCl͑001͒. Deposition at a surface temperature T s ϭ90 K gives rise to a single stable low density phase ͑phase I͒. At T s ϭ80 K phase I formed first, but growth continues to form a second, higher density phase. At T s Ϸ50 K we observe layer by layer growth up to at least five layers of acetylene. The symmetries of the high and low temperature phases have been determined from HAS diffraction patterns. Structural models for both phases are proposed based upon the results of the HAS and previous IR studies. Adsorption of C 2 D 2 on NaCl͑001͒ has also been investigated. No differences in the structures of C 2 D 2 and C 2 H 2 monolayers were observed.

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Section: Introductionmentioning

confidence: 94%

Two phases of acetylene adsorbed on NaCl(001) studied by high-resolution helium atom scattering

Glebov¹,

Miller²,

Toennies³

1997

The Journal of Chemical Physics

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“…Helium scattering has previously been used to study a number of adsorbates on similar insulating substrates. [17][18][19] Sharp rises have been found in the adsorption isotherms of H 2 O/NaCl͑100͒ at room temperature 20 and at 140 K, 11,12 which indicate that there is condensation of at least a monolayer of water on NaCl͑100͒ before 3D phases form. The heats of adsorption are in the range 50-60 kJ mol Ϫ1 , 12,13 and the corresponding heats of vaporization and sublimation of bulk water/ice are 45 and 51 kJ mol Ϫ1 , respectively.…”

Section: Introductionmentioning

confidence: 98%

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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“…[16][17][18][19][20][21][22][23] These results reveal that the bonding is governed by rather complex force fields that depend strongly on both the electrostatic properties of the admolecules as well as on the electric fields and field gradients produced by the ions of the substrate. 24 Ab initio potential energy calculations have provided additional insight into the adsorption characteristics of such systems.…”

Section: Introductionmentioning

confidence: 99%

Phonon-libron dynamics of acetylene adsorbed onNaCl(001)

et al. 1998

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The phonon-dispersion curves of the high-temperature (3ͱ2ϫͱ2)R45°phase of acetylene on NaCl͑001͒ have been measured using high-resolution time-of-flight inelastic helium-atom scattering and compared with semiempirical calculations. The observed two Einstein vibrational modes at 8 and 14 meV are assigned to a collective perpendicular motion of the molecule centers of mass in the monolayer and to a collective librational motion of the molecular axes, respectively. With the same semiempirical potential used in the dynamical calculations, the 0 K adsorbate monolayer structure is predicted to be (ͱ2ϫͱ2)R45°which is at variance with the (7ͱ2ϫͱ2)R45°structure determined at TϽ80 K by helium diffraction. The results are compared with structure assignments based on infrared spectroscopy and ab initio calculations.

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Monolayer structures of carbon monoxide adsorbed on sodium chloride: A helium atom diffraction study

Cited by 83 publications

References 19 publications

Two phases of acetylene adsorbed on NaCl(001) studied by high-resolution helium atom scattering

Two phases of acetylene adsorbed on NaCl(001) studied by high-resolution helium atom scattering

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

Phonon-libron dynamics of acetylene adsorbed onNaCl(001)

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