Competing photodissociation pathways for physisorbed O2/graphite investigated using Ar spacer layers

Friedrich, Christian; Wilkes, John; Palmer, Richard; Bennett, S.L.; MacDonald, M A; Lamont, Christine L. A.; Foord, John S.

doi:10.1016/s0009-2614(95)01233-8

Cited by 6 publications

(3 citation statements)

References 17 publications

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“…The most prominent difference in figure 4(b) and (c) compared with the gas phase (figure 4(a)) is the presence of an ion signal in the photon energy range of 25-30 eV. Despite the previous observation of this behaviour [5,9], no detail mechanism has yet been proposed. In order to investigate this behaviour further we plot in figure 5 the coverage dependence of the O − ion yield as a function of O 2 thickness for three different photon energies, 22, 24 and 28 eV.…”

Section: Resultsmentioning

confidence: 91%

“…The surface photochemistry of physisorbed O 2 as a model system has been the subject of many studies, at both multilayer [5][6][7] and monolayer coverage [8]. The surface photochemistry of O 2 physisorbed on argon spacer layers on the graphite surface [9] 0953-8984/97/275815+08$19.50 c 1997 IOP Publishing Ltd has recently been investigated to obtain further information on the relative importance of direct and indirect channels. This still does not provide unambiguous identification of the mechanisms since different physical processes can arise in the same photon energy range.…”

Section: Introductionmentioning

confidence: 99%

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A comparative study of the photodissociation of physisorbed on Pt(111) and graphite

Šiller

Bennett

Crabtree

et al. 1997

J. Phys.: Condens. Matter

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A comparative study of photodesorption from physisorbed oxygen layers on (highly oriented pyrolytic) graphite and Pt(111) surfaces has been carried out using continuously tuneable synchrotron radiation in the energy range 13 - 35 eV. The photodesorption of both and species is detected. Through monitoring the ion yields as a function of the photon energy and coverage we have proposed a new mechanism for photodesorption of ions induced by inelastic scattering and attachment of photoelectrons originating from the adsorbate layer in the photon energy region between 25 and 30 eV.

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Section: Resultsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

A comparative study of the photodissociation of physisorbed on Pt(111) and graphite

Šiller

Bennett

Crabtree

et al. 1997

J. Phys.: Condens. Matter

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“…It is also of interest to compare the VUV photochemistry of physisorbed O 2 to that of chemisorbed O 2 , such as O 2 chemisorbed on Si(111)-(7 × 7) [13]. Previous synchrotron-based studies [102,[163][164][165] of physisorbed O 2 on graphite have revealed interesting dynamics that appear to be operative only at higher photon energies. O + was the only species observed to desorb.…”

Section: Omentioning

confidence: 99%

Surface photochemistry in the vacuum and extreme ultraviolet (VUV and XUV): high harmonic generation, H₂O and O₂

Kołasiński¹

2006

J. Phys.: Condens. Matter

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Techniques to produce light in the vacuum ultraviolet (VUV; 100 nm≤λ≤200 nm) and extreme ultraviolet (XUV; 10 nm≤λ≤100 nm) are reviewed. Special emphasis is placed on high harmonic generation (HHG). Experimental studies that have utilized HHG as well as the VUV and XUV surface photochemistry of H2O and O2 are reviewed. HHG is shown to be a promising technique for the investigation of the dynamics of electrons and surface photochemistry. Lateral interactions and adsorbate structure in adsorbed H2O and O2 layers are shown to have important roles in determining the fate of ions produced by dissociative photoionization at surfaces.

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Tunable pulsed vacuum ultraviolet light source for surface science and materials spectroscopy based on high order harmonic generation

Riedel

Hernández‐Pozos

Palmer

et al. 2001

Review of Scientific Instruments

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We report here the development of a tunable vacuum ultraviolet light source, providing subpicosecond pulses over the wavelength range from 114 (∼11 eV) to 32 nm (∼39 eV), designed for surface science experiments. The source is based on high order harmonic generation. The experimental setup is described in detail and the harmonic yield as a function of the gas type (xenon or argon) is compared with theoretical descriptions. We address in particular the tunability of the source, desirable for surface science applications. Absolute characterization of the harmonic yield has also been performed and validated with time-resolved fluorescence measurements. The results are extremely promising, with intensities of ∼1010 photons/s, with regard to the use of this coherent source for surface science and spectroscopy.

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Competing photodissociation pathways for physisorbed O2/graphite investigated using Ar spacer layers

Cited by 6 publications

References 17 publications

A comparative study of the photodissociation of physisorbed on Pt(111) and graphite

A comparative study of the photodissociation of physisorbed on Pt(111) and graphite

Surface photochemistry in the vacuum and extreme ultraviolet (VUV and XUV): high harmonic generation, H₂O and O₂

Tunable pulsed vacuum ultraviolet light source for surface science and materials spectroscopy based on high order harmonic generation

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Competing photodissociation pathways for physisorbed O2/graphite investigated using Ar spacer layers

Cited by 6 publications

References 17 publications

A comparative study of the photodissociation of physisorbed on Pt(111) and graphite

A comparative study of the photodissociation of physisorbed on Pt(111) and graphite

Surface photochemistry in the vacuum and extreme ultraviolet (VUV and XUV): high harmonic generation, H2O and O2

Tunable pulsed vacuum ultraviolet light source for surface science and materials spectroscopy based on high order harmonic generation

Contact Info

Product

Resources

About

Surface photochemistry in the vacuum and extreme ultraviolet (VUV and XUV): high harmonic generation, H₂O and O₂