Study of Cluster Anions Generated by Laser Ablation of Titanium Oxides: A High Resolution Approach Based on Fourier Transform Ion Cyclotron Resonance Mass Spectrometry |
| |
Authors: | Nicolas Barthen Eric Millon Frédéric Aubriet |
| |
Institution: | 1.Laboratoire de Spectrométrie de Masse et de Chimie Laser, Institut Jean Barriol Fédération de Recherche 2843, Université Paul Verlaine–Metz 1,Cedex 03,France;2.GREMI, UMR 6606–CNRS,Université d’Orléans,Orléans,France |
| |
Abstract: | Laser ablation of titanium oxides at 355 nm and ion–molecule reactions between (TiO2)x]–• cluster anions and H2O or O2 were investigated by Fourier transform ion cyclotron resonance mass spectrometry (FTICR MS) with an external ion source.
The detected anions correspond to (TiO2)x(H2O)yOH]– and (TiO2)x(H2O)yO2]–• oxy-hydroxide species with x = 1 to 25 and y = 1, 2, or 3 and were formed by a two step process: (1) laser ablation, which
leads to the formation of (TiO2)x]–• cluster anions as was previously reported, and (2) 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: (1) elimination of water molecules, (2) O2 loss for radical anions, and (3) fission of the cluster. Density functional theory (DFT) calculations were performed to explain
the experimental data. |
| |
Keywords: | |
本文献已被 PubMed SpringerLink 等数据库收录! |
|