The O2Ag(111) interaction studied by 100–3000 eV glancing incidence O+2 scattering

Reijnen, P.H.F.; Hoek, P.J. van den; Kleyn, Aart W.; Imke, U.; Snowdon, K.J.

doi:10.1016/0039-6028(89)90480-9

Cited by 74 publications

(13 citation statements)

References 53 publications

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“…5 are consistent with data reported for similar molecular-ion/surface systems. 60,[72][73][74][75][76] The NO Ϫ product yield was approximately double the O Ϫ yield. Furthermore, there appeared to be a correlation between NO Ϫ product yield and surface preparation that was not observed in the O Ϫ product channel.…”

Section: Resultsmentioning

confidence: 94%

“…5 the threshold for O Ϫ emergence is over 15 eV greater than the reaction endoergicity, 77 a feature common to analogous systems. 60,[72][73][74][75][76] Figure 6 shows that the O Ϫ kinetic energy distributions are fairly broad, and O Ϫ never escapes with more than 40% of the incident collision energy. Furthermore, assuming the atomic products are not electronically excited and escape with equal average kinetic energies, Fig.…”

Section: Formation Of O ؊ ( 2 P)mentioning

confidence: 99%

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Scattering aligned NO+ on Ag(111): The effect of internuclear-axis direction on NO− and O− product formation

Greeley

Martin

Morris

et al. 1995

The Journal of Chemical Physics

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Hyperthermal energy reactions of NO ϩ with Ag͑111͒ were studied as a function of collision energy and the incident diatom's internuclear-axis direction. Laser photoselection via ͑1ϩ1Ј͒ resonance enhanced multiphoton ionization ͑REMPI͒ prepared an aligned distribution of NO ϩ ͑X 1 ⌺ ϩ , E trans , vϭ0, J͒ prior to the molecules impact with the surface. The emergence of scattered O Ϫ products was enhanced when NO ϩ approached the surface with an ''end-on'' rather than a ''side-on'' orientation. Moreover, the magnitude of the reaction's alignment preference increased with decreasing collision energy. The appearance threshold for O Ϫ was approximately 20 eV. Classical trajectory calculations demonstrated that these results are consistent with a collision-induced dissociation mechanism mediated by both vibrational and rotational excitation upon impact. Reorientation of the internuclear axis during the collision drastically affects the simulated dissociation dynamics. No alignment preference for scattered NO Ϫ emergence could be discerned from the experiments. As a complement, the angular momentum mechanics are provided to predict the internuclear-axis distribution of ions created via two-photon REMPI.

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Section: Resultsmentioning

confidence: 94%

Section: Formation Of O ؊ ( 2 P)mentioning

confidence: 99%

Scattering aligned NO+ on Ag(111): The effect of internuclear-axis direction on NO− and O− product formation

Greeley

Martin

Morris

et al. 1995

The Journal of Chemical Physics

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“…The electron transfer process leading to negative ion formation is referred to as harpooning. [25][26][27][28][29] There is no evidence so far that more than one molecular chemisorbed species is present on Ag͑111͒.…”

Section: Introductionmentioning

confidence: 99%

O2 transient trapping-desorption at the Ag(111) surface

Raukema

Butler

Kleyn

1997

The Journal of Chemical Physics

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Molecular beam scattering experiments of O2 from Ag(111) carried out at a surface temperature of 150 K, which is below the desorption temperature for the molecular chemisorption state, show three different scattering paths: physisorption followed by desorption, direct-inelastic scattering and transient trapping-desorption. The transient trapping-desorption process is attributed to transient adsorption of the molecule in a metastable O2δ− state at the surface. The translational desorption energy of the transiently trapped molecules is far above thermal, strongly dependent on the surface temperature and independent of the translational energy and angle of the incident oxygen molecule. A strongly peaked intensity distribution around the surface normal is observed for the desorption. The transient trapping probability shows a sharp increase above a threshold energy and a subsequent decrease with increasing incidence energy. It is accompanied by a strong broadening in the angular direct-inelastically scattered flux distribution. The possible origin of the metastable O2δ− state will be discussed.

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“…11,[14][15][16][29][30][31][32][33][34][35][36][37][38][39][40][41][42] In much of this previous work, emphasis has been given to calculating interaction potentials for alkali ions incident on metallic surfaces. There are many reasons for this, including the relative simplicity of detecting scattered alkali ions, the comparatively well understood charge transfer properties, and the noble-gas electronic structure of positive alkali ions, which simplifies the calculation of ion-surface interaction potentials.…”

Section: A Interaction Potentialsmentioning

confidence: 99%

Surface trapping during hyperthermal energy scattering

2000

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We present the results of a detailed investigation of surface trapping during the scattering of hyperthermal (р600 eV) energy ions from metallic surfaces. Recent experiments have revealed that trends in surface trapping probabilities are highly dependent on factors such as incident ion energy, species, and angle. By comparing the results of classical trajectory simulations to experimental data, we show that the surface corrugation seen by the incident ions plays a key role in determining surface trapping trends for ions incident at hyperthermal energies.

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The O2Ag(111) interaction studied by 100–3000 eV glancing incidence O+2 scattering

Cited by 74 publications

References 53 publications

Scattering aligned NO+ on Ag(111): The effect of internuclear-axis direction on NO− and O− product formation

Scattering aligned NO+ on Ag(111): The effect of internuclear-axis direction on NO− and O− product formation

O2 transient trapping-desorption at the Ag(111) surface

Surface trapping during hyperthermal energy scattering

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