Data di Pubblicazione:
2008
Citazione:
Probing the chemical reactivity of free titanium clusters by x-ray absorption spectroscopy / T. Mazza, P. Piseri, G. Bongiorno, L. Ravagnan, M. Amati, M. Devetta, C. Lenardi, M. Coreno, M. de Simone, P. Milani. - In: APPLIED PHYSICS. A, MATERIALS SCIENCE & PROCESSING. - ISSN 0947-8396. - 92:3(2008), pp. 463-471.
Abstract:
Synchrotron radiation-based experimental techniques are largely employed for the characterization of the reactivity of finite size systems; in particular, x-ray absorption spectroscopy (XAS) is a suitable tool to shed light on the local electronic structure and chemical status of atoms in nano-objects, as it is very sensitive to the local bonding environment of the probed site. In supported clusters intrinsic properties and reactivity are largely distorted and obscured by the changes imposed by the growth procedure and by the influence of the substrate, so the attainability of experiments on free clusters reacting with species in the gas phase is a primary goal in the development of cluster science.
In this paper we report a proof of principle of the applicability of gas phase XAS technique to titanium and titanium oxide, hydride and hydrate systems. Experiments are performed by coupling a pulsed microplasma cluster source (PMCS) with a third generation synchrotron light source, and measuring the intensity of the electron yield coming from the interaction of VUV photons with the clusters seeded in a supersonic beam.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Titanium ; free clusters ; X-ray absorption spectroscopy ; NEXAFS ; chemical reactivity
Elenco autori:
T. Mazza, P. Piseri, G. Bongiorno, L. Ravagnan, M. Amati, M. Devetta, C. Lenardi, M. Coreno, M. de Simone, P. Milani
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