Infrared spectroscopy of CO on NaCl(100) III. Submonolayers and isotopic mixtures

Noda, Chifuru; Ewing, George E.

doi:10.1016/0039-6028(90)90741-p

Cited by 58 publications

(16 citation statements)

References 31 publications

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“…Physisorption of CO on NaCl͑001͒ is accurately represented by the Langmuir isotherm. 41 For this particular system at 55 K, ⌰ϭ0.5 occurs at p/ p o ϭ2ϫ10 Ϫ8 and monolayer coverage is effectively achieved by p/p o ϭ10 Ϫ7 . Increases in pressure by several orders of magnitude do not alter the adlayer structure or the extent of coverage as documented by polarized infrared absorption measurements.…”

Section: Discussionmentioning

confidence: 90%

“…Increases in pressure by several orders of magnitude do not alter the adlayer structure or the extent of coverage as documented by polarized infrared absorption measurements. 41 Multilayer crystalline CO is formed at p/p 0 ϭ1. When the multilayer does form, the original monolayer structure ͓with CO molecules centered over Na ϩ ions and each axis perpendicular to the ͑001͒ face 13 ͔ is not appreciably altered.…”

Section: Discussionmentioning

confidence: 99%

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Adsorption of water on the NaCl(001) surface. II. An infrared study at ambient temperatures

Foster

Ewing

2000

The Journal of Chemical Physics

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133

166

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Water adsorbed on the (001) face of NaCl under ambient conditions has been studied by infrared spectroscopy. From these measurements, combined with recent Monte Carlo calculations, we find evidence of two structures for the adsorbed water. At low coverages, the water molecules aggregate into islands on the surface. When a critical concentration is reached, multilayer growth becomes favorable, creating a thin film on the surface with properties similar to liquid water.

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Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Adsorption of water on the NaCl(001) surface. II. An infrared study at ambient temperatures

Foster

Ewing

2000

The Journal of Chemical Physics

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133

166

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“…In the present system there are unfortunately many unknown parameters, and thus these values cannot be determined with any reliable accuracy. Complicating factors are here: additional chemical shifts that are independent of coverage 19,30 ͑in principle, the latter could be addressed with isotopic-mixture experiments͒, the interaction between many different vibrational modes, 24 the unknown single-mode coverage, the bond angle for uncoupled modes, 12 the image-dipole contribution to the lattice sum, 12,28 and perhaps a multipole contribution beyond the dipole-dipole approximation. 31 Surprisingly, to our knowledge the better-defined hydrogen-terminated silicon surfaces have not yet been addressed with the microscopic dipoledipole interaction theory.…”

Section: Resultsmentioning

confidence: 99%

Experimental and theoretical evidence for a hydrogen stabilizedc(2×2)reconstruction of the P-rich InP(001) surface

et al. 2006

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The formation of hydrogen bonds was investigated on the P-rich InP͑001͒ surface employing attenuated total-reflection Fourier-transform infrared spectroscopy, low-energy electron diffraction, and total-energy density-functional theory calculations. Strong evidence was found for a c͑2 ϫ 2͒-2P-3H reconstruction with a higher hydrogen coverage than is characteristic for the metal-organic chemical-vapor deposition prepared hydrogen-stabilized ͑2 ϫ 2͒-2D-2H surface. The new surface reconstruction was formed upon exposure to atomic hydrogen. Complete transformation of all the metastable atomic configurations to form the new surface reconstruction was not achieved, since prior to this the surface began to deteriorate. The latter effect was monitored as the formation of In-H bonds. Two observations, i.e., nearly complete screening of the infrared peaks for excitation with p-polarized light and a pronounced redshift of P-H peaks with increasing hydrogen coverage were attributed to dipole-dipole interaction between the vibrating adsorbates.

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“…Continuous monotonic changes in bandwidth and frequency of a single feature with coverage are observed with CO on NaCl͑100͒. 21 We interpret submonolayers of CO as randomly occupied. The local density of adsorbates, and consequently their static and dynamic couplings, depend continuously on coverage.…”

Section: Formation Of the Adlayermentioning

confidence: 69%

“…The local density of adsorbates, and consequently their static and dynamic couplings, depend continuously on coverage. 21,22 Other systems, such as CO 2 or CH 4 on NaCl͑100͒, form islands at submonolayer coverage. The density of adsorbates within an island, and thus the intermolecular coupling ͑excluding domain-edge effects͒, do not depend on coverage.…”

Section: Formation Of the Adlayermentioning

confidence: 99%

An amorphous monolayer: Infrared spectroscopic and theoretical studies of SO2 on NaCl (100)

Berg

Ewing

Meredith

et al. 1996

The Journal of Chemical Physics

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At temperatures between 100 and 110 K, exposing the ͑100͒ face of NaCl to unsaturated SO 2 gas yields a stable adlayer. Infrared spectra of adsorbed SO 2 contain complex resonances near the origins of the molecular symmetric and asymmetric stretching vibrations. On photometric grounds the absolute coverage of the surface is found to be one molecule per exposed Na ϩ Cl Ϫ ion pair. The spectra of this monolayer consist of several sharp lines overlapping one broad feature for each molecular mode. By comparison to vibrational excitons in simpler systems, the coexistence of crystalline and amorphous adlayer structures is strongly indicated. This partial ordering is pressure dependent, and develops spontaneously on a time scale of minutes. The disordered component, in contrast, is never in equilibrium with the gas phase. Computational simulations have detailed the microscopic basis of this behavior. Accurate ab initio models of the SO 2 molecule and NaCl͑100͒ surface were used in a Monte Carlo simulation of the experimental conditions. At both half and full coverage, an amorphous two-dimensional condensate developed. This is minimally consistent with the polarized infrared photometry. Seemingly equilibrated Monte Carlo runs retained some memory of the initial molecular configuration, again consistent with hysteresis observed in the spectroscopic experiments. No structural order developed in the simulations, but the energetic state of affairs was clarified: the potential driving adsorption and condensation is deep in comparison to available thermal energy, but relatively insensitive to molecular orientation.

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Infrared spectroscopy of CO on NaCl(100) III. Submonolayers and isotopic mixtures

Cited by 58 publications

References 31 publications

Adsorption of water on the NaCl(001) surface. II. An infrared study at ambient temperatures

Adsorption of water on the NaCl(001) surface. II. An infrared study at ambient temperatures

Experimental and theoretical evidence for a hydrogen stabilizedc(2×2)reconstruction of the P-rich InP(001) surface

An amorphous monolayer: Infrared spectroscopic and theoretical studies of SO2 on NaCl (100)

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