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Accueil du site > Production scientifique > Study of Cluster Anions Generated by Laser Ablation of Titanium Oxides : A High Resolution Approach Based on Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

Study of Cluster Anions Generated by Laser Ablation of Titanium Oxides : A High Resolution Approach Based on Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

Date de publication: 1er mars 2011

N. Barthen, E. Millon, F. Aubriet
J. Am. Soc. Mass Spectrom. 22 728 (2011). DOI

Travail réalisé sur le site de l’Université Paul Verlaine.

Abstract

Laser ablation of titanium oxides at 355nm and ion-molecule reactions between [(TiO2)x]•– cluster anions and H2O or O2 were investigated by Fourier transform ion cyclotron resonance mass spectrometry with an external ion source. Detected anions correspond to [(TiO2)x(H2O)yOH]– and [(TiO2)x(H2O)yO2]•– oxyhydroxides species with x = 1 to 25 and y = 1, 2 or 3 and were formed by a two step process : (i) laser ablation, which leads to the formation of [(TiO2)x]•– cluster anions as it was previously reported and, (ii) ion-molecule reactions during ion storage. Reactions of some [(TiO2)x]•– cluster anions with water and dioxygen conducted in the FTICR cell, confirm this assessment. Tandem mass spectrometry experiments were also performed in sustained off-resonance irradiation collision-induced dissociation (SORI-CID) mode. Three fragmentation pathways were observed : (i) elimination of water molecules, (ii) O2 loss for radical anions and, (iii) fission of the cluster. Density functional theory (DFT) calculations were performed to aid in the analysis of experimental data.