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Formation and photodecomposition of cationic titanium oxide clusters

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Abstract

In this paper we report on the titanium oxide cluster cations Ti x O + y , generated by laser ablation of a titanium target in the region of the nozzle expansion of oxygen. The mass distribution of the clusters produced is recorded with a time-of-flight mass spectrometer. Three different series, namely TiO(TiO2) + n , TiO(TiO2) n O +2 , and (TiO2) + n , appear in the spectra. Two different ablation wavelengths (infrared at 1064 nm and ultraviolet at 308 nm) are used to generate the titanium oxide clusters. At the shorter wavelength the maximum size of the clusters formed decreases.

The interaction of the UV photons with the Ti x O + y clusters is further investigated in a separate two-laser arrangement with an IR laser for ablation and after some mm downstream with an UV system for the cluster beam irradiation. These studies indicate that the intensity of the T x O + y clusters with x≥4, y≥7 is strongly influenced by the absorption of UV photons. This is attributed mainly to dissociation into smaller ones.

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Authors and Affiliations

  1. Foundation for Research and Technology-Hellas, Institute of Electronic Structure and Laser, P.O. Box 1527, 711 10, Heraklion, Greece

    Michalis Velegrakis & Antonis Sfounis

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  1. Michalis Velegrakis
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  2. Antonis Sfounis
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Correspondence to Michalis Velegrakis.

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Velegrakis, M., Sfounis, A. Formation and photodecomposition of cationic titanium oxide clusters. Appl. Phys. A 97, 765–770 (2009). https://doi.org/10.1007/s00339-009-5343-7

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  • DOI: https://doi.org/10.1007/s00339-009-5343-7

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