Low-energy reactive ion scattering as a probe of surface femtochemical reaction: H+ and H− formation on ionic compound surfaces

Souda, Ryūtarō; Suzuki, Taku; Kawanowa, H.; Asari, E.

doi:10.1063/1.477835

Cited by 24 publications

(24 citation statements)

References 34 publications

(32 reference statements)

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“…The possibility of electron transition by the AU process is determined by the competition between the interaction time of the He* at the surface (Ϸ10 Ϫ12 s) and the lifetime of the holes in the band, ϭh/W, where W presents the bandwidth. 24 In this estimation of the lifetime of the holes (Ϸ10 Ϫ15 s), the AU process seems unlikely to occur. Very recently, it was indicated by Morgner 25 that the Madelung potential caused the lifetime of the holes at the outermost surface to be longer than that in the bulk in the case of LiF and NaCl.…”

Section: Resultsmentioning

confidence: 99%

TiO(001) single-crystal film formation by the incorporation of oxygen from MgO into the deposited Ti film

et al. 2000

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The formation of a TiO͑001͒ film on MgO͑001͒ was investigated using metastable impact electron spectroscopy ͑MIES͒, ultraviolet photoelectron spectroscopy ͑He I͒, impact-collision ion scattering spectroscopy, and electron diffraction techniques. It was found that epitaxial TiO films were formed by Ti deposition on the MgO surface followed by annealing at 1000 K. The TiO film formation was related to the incorporation of oxygen from MgO into the deposited Ti film. Metallic properties of the outermost surface of the TiO film were strongly suggested by the fact that electron emission due to the autodetachment mechanism occurred in MIES, where the interaction was determined by the Coulomb interaction between temporary negative He Ϫ * ions and the hole created at the TiO surface. The work function increased from 2.6 to 5.0 eV when the TiO surface was exposed to O 2 . The electronic structure of the MgO-͑2ϫ2͒-Ti superstructure was also investigated. It is suggested that Ti is in the four-valent state at the 2ϫ2 surface.

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Section: Resultsmentioning

confidence: 99%

TiO(001) single-crystal film formation by the incorporation of oxygen from MgO into the deposited Ti film

et al. 2000

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“…Neutralization in large-angle alkali ion scattering is sensitive to the inhomogeneous LEP associated with electropositive and electronegative adsorbates on metal surfaces [13,[18][19][20][21][22][23][24][25][26][27][28][29], and should therefore also be useful in probing an inhomogeneous metal oxide surface [30]. Previous experiments investigating charge exchange between low energy projectiles and metal oxide surfaces [16,17] were performed in a small scattering angle configuration (67°), which does not allow for separation of scattering from different sites.…”

Section: Introductionmentioning

confidence: 99%

Charge exchange between low energy alkali ions and cerium oxide surfaces

Liu

Yarmoff

2006

Surface Science

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“…The experimental results and discussion are given in Sec. 3. The mechanism of neutralization of protons and negative ionization of hydrogen is dealt with in Subsec.…”

Section: Introductionmentioning

confidence: 99%

Femtosecond Electron Dynamics on Solid Surfaces Probed by Ion Scattering and Stimulated Desorption of Secondary Ions

Souda

2000

Int. J. Mod. Phys. B

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In this article, the mechanism of electronic transitions during scattering and stimulated desorption of ions from solid surfaces is discussed. Reactive ions such as H + and O + experience transient chemisorption during scattering from solid surfaces. These ions are neutralized almost completely on metal and semiconductor surfaces due to the band effect on resonance neutralization. The neutralization probability of H + is suppressed considerably on highly ionic compound surfaces and is dependent on the target species due to the formation of the bound state (on cations) or the surface molecule (on anions). Because of this, the H − ion is formed preferentially on the cationic site rather than on the anionic site. The noble-gas ions are neutralized via the Auger process so that the neutralization probability is basically independent of the band effect. The stimulated desorption of secondary O + and F + ions does not exhibit the band effect. This is because the desorption is initiated by the core hole state, which is followed by ionization via the intra-atomic Auger decay after breakage of the chemisorptive bond. The stimulated desorption of H + might occur from the valence holes but is more likely to be caused by the core-excited OH species via the interatomic Auger decay. The core hole is created not only by the electron and photon irradiation but also by the energetic ion bombardment due to the nonadiabatic transition of the primary ion's core hole. Also presented are some applications of ion scattering and ion stimulated desorption for the analysis of the diffusion/segregation dynamics of oxygen and hydrogen on solid surfaces.

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Low-energy reactive ion scattering as a probe of surface femtochemical reaction: H+ and H− formation on ionic compound surfaces

Cited by 24 publications

References 34 publications

TiO(001) single-crystal film formation by the incorporation of oxygen from MgO into the deposited Ti film

TiO(001) single-crystal film formation by the incorporation of oxygen from MgO into the deposited Ti film

Charge exchange between low energy alkali ions and cerium oxide surfaces

Femtosecond Electron Dynamics on Solid Surfaces Probed by Ion Scattering and Stimulated Desorption of Secondary Ions

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