Two-dimensional state resolved imaging after UV-laser induced desorption: NO/NiO(111)

Menges, M.; Baumeister, B.; Al‐Shamery, Katharina; Freund, H.‐J.; Fischer, Charlotte Froese; Andresen, Peter L.

doi:10.1016/0039-6028(94)91132-0

Cited by 39 publications

(37 citation statements)

References 39 publications

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“…The XPS and LEED experiments were carried out in a UHV chamber which has been described in detail elsewhere [18]. XP spectra were recorded using non-monochromatic Mg K a radiation and a hemispherical electron analyser (HA100 from VSW Scientific Instruments).…”

Section: Methodsmentioning

confidence: 99%

Oxidation and thermal stability of nickel deposited on a thin alumina support

2006

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Section: Methodsmentioning

confidence: 99%

Oxidation and thermal stability of nickel deposited on a thin alumina support

2006

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“…22 The system was equipped with low-energy electron diffraction ͑LEED͒, Auger electron spectroscopy ͑AES͒, x-ray photoelectron spectroscopy ͑XPS͒, x-ray Auger electron spectroscopy ͑XAES͒, and a TPD facility. Infrared spectra were recorded in a different UHV chamber described elsewhere, equipped with a Mattson Fourier-transform infrared spectrometer ͑FTIR͒ with 2 cm Ϫ1 resolution.…”

Section: Methodsmentioning

confidence: 99%

Ultraviolet-laser induced desorption of NO from the Cr2O3(0001) surface: Involvement of a precursor state?

Wilde

Seiferth

Al‐Shamery

et al. 1999

The Journal of Chemical Physics

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A joint theoretical-experimental investigation of the lower bound states of the NO (X 2 Π)-Ar complex NO molecules interact with the Cr 2 O 3 (0001) surface to form a chemisorption bond of 1.0 eV. At higher coverages an additional more weakly bound species appears in thermal desorption spectra with a binding energy of 0.35 eV. By infrared spectroscopy the weakly adsorbed species is identified to be an unusually strong bound NO-dimer exhibiting a weak feature at 1857 cm Ϫ1 beside the chemisorbate absorption band at 1794 cm Ϫ1 . Laser induced desorption experiments performed at 6.4 eV are presented with main emphasis on the high coverage regime. The desorbing molecules are detected quantum state selectively using resonance enhanced multiphoton ionization. The desorbing molecules are strongly rotationally and vibrationally excited conform with a nonthermal excitation process. The velocity distributions of single rovibronic states of desorbing NO are bimodal and exhibit a strong coupling of rotation and translation. With increasing coverages an additional channel is observed appearing in the time-of-flight spectra of vЉϭ0 as smoothly increasing intensity at long flight times. The numeric values of these unusually long flight times are indicative for long residence times on the surface rather than small kinetic energies. The desorption efficiencies weakly depend on the concentration and vibrational state ranging from (2.0Ϯ0.3)ϫ10 Ϫ17 cm 2 at low coverages to (1.0Ϯ0.4)ϫ10 Ϫ17 cm 2 at high coverages for vЉϭ0. The intensity of the desorption signal per laser pulse only increases proportional to the chemisorbate coverage. The data are interpreted assuming the dimers to act as extrinsic precursors within the desorption process.

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“…The base pressure was kept below 5 Â 10 À11 mbar during the experiments. [16] A NiAl(110)-terminated singlecrystal surface was cleaned by the conventional treatment. An epitaxial Al 2 O 3 film of 5 thickness was obtained by oxidizing the cleaned crystal through exposure to 6 Â 10 À6 mbar of oxygen at 500 K and annealing at 1100 K. For the experiment the sample was cooled to 40 K with liquid helium.…”

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Photochemistry of Methane on Pd/Al2O3 Model Catalysts: Control of Photochemistry on Transition Metal Surfaces

Watanabe

Matsumoto

Kampling

et al. 1999

Angew. Chem. Int. Ed.

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The mean size of the Pd clusters deposited on an Al(2)O(3) thin film influences the efficiency of photodissociation of CD(4) into CD(3) and D as well as the photodesorpion upon irradiation with 193-nm laser light. The picture shows the degree of desorption on Pd clusters of various sizes (as well as on a Pd(111) single-crystal surface) as a function of temperature; the values given refer to the average thickness of the evaporated metal layer.

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Two-dimensional state resolved imaging after UV-laser induced desorption: NO/NiO(111)

Cited by 39 publications

References 39 publications

Oxidation and thermal stability of nickel deposited on a thin alumina support

Oxidation and thermal stability of nickel deposited on a thin alumina support

Ultraviolet-laser induced desorption of NO from the Cr2O3(0001) surface: Involvement of a precursor state?

Photochemistry of Methane on Pd/Al2O3 Model Catalysts: Control of Photochemistry on Transition Metal Surfaces

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