Island formation in chemisorption 1. Chemisorption model

Саланов, А. Н.; Bibin, V. N.; Рудина, Н. А.

doi:10.1007/bf02475343

Cited by 3 publications

(4 citation statements)

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“…36 The influence of "indirect" and "direct" dissociative sticking probabilities (S indir and S dir ) in the development of surface structures has been discussed by Salanov and co-authors. 37,38 In their Monte Carlo simulations, at S indir /S dir g 1.0, islandforming adsorption dominates. The concentration of the islands is low, but their size is large.…”

Section: Resultsmentioning

confidence: 97%

“…Studies of hydrogen dissociation on stepped Pt surfaces indicate that, in addition to direct dissociation on the terraces, an indirect channel appears at low kinetic energy . The influence of “indirect” and “direct” dissociative sticking probabilities ( S indir and S dir ) in the development of surface structures has been discussed by Salanov and co-authors. , In their Monte Carlo simulations, at S indir / S dir ≥ 1.0, island-forming adsorption dominates. The concentration of the islands is low, but their size is large.…”

Section: Resultsmentioning

confidence: 99%

“…37,38 In their Monte Carlo simulations, at S indir /S dir g 1.0, islandforming adsorption dominates. The concentration of the islands is low, but their size is large.…”

Section: Articlementioning

confidence: 97%

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Atomic-Scale Dynamics of Surface-Catalyzed Hydrogenation/Dehydrogenation: NH on Pt(111)

Liang

Yang

et al. 2015

ACS Nano

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Low-temperature scanning tunneling microscopy (LT-STM) was used to move hydrogen atoms and dissociate NH molecules on a Pt(111) surface covered with an ordered array of nitrogen atoms in a (2 × 2) structure. The N-covered Pt(111) surface was prepared by ammonia oxydehydrogenation, which was achieved by annealing an ammonia-oxygen overlayer to 400 K. Exposing the N-covered surface to H2(g) forms H atoms and NH molecules. The NH molecules occupy face-centered cubic hollow sites, while the H atoms occupy atop sites. The STM tip was used to dissociate NH and to induce hopping of H atoms. Action spectra consisting of the reaction yield versus applied bias voltage were recorded for both processes, which revealed that they are vibrationally mediated. The threshold voltages for NH dissociation and H hopping were found to be 430 and 272 meV, corresponding to the excitation energy of the N-H stretching and the Pt-H stretching modes, respectively. Substituting H with D results in an isotopic shift of -110 and -84 meV for the threshold voltages for ND dissociation and D hopping, respectively. This further supports the conclusion that these processes are vibrationally mediated.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

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Atomic-Scale Dynamics of Surface-Catalyzed Hydrogenation/Dehydrogenation: NH on Pt(111)

Liang

Yang

et al. 2015

ACS Nano

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“…In our previous paper [13], we studied a model of dissociative chemisorption including "direct" (without a precursor) and "indirect" (with a precursor) adsorption pathways. Under certain conditions, adsorption islands are formed and gradually grow.…”

Section: Introductionmentioning

confidence: 99%

Island formation in chemisorption 2. Chemisorption kinetics

Саланов

Bibin

Рудина

1998

React Kinet Catal Lett

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Influence of"direct" and "indirect" pathways of dissociative chemisorption on the form of kinetic dependences 0(MCS) and S(0) was studied by the Monte Carlo method. Langmuir adsorption observed at Smd~/S~ -< 0.1 gradually changes to island-mediated adsorption with an increase of the "indirect" adsorption eonm'bution at 0.1 _< Sindir/Sdir ~ 1.0. At Sindir/Sdir >--1.0 the island-mediated adsorption dominates: large adsorption islands arise and gradually grow.

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