Influence of the photoionization process on the fragmentation of laser desorbed polycyclic aromatic hydrocarbons |
| |
| Authors: | K. Thomson M. Ziskind C. Mihesan E. Therssen C. Focsa |
| |
| Affiliation: | a Laboratoire de Physique des Lasers, Atomes et Molécules (UMR 8523), Centre d’Etudes et de Recherches Lasers et Applications (FR CNRS 2416), Université des Sciences et Technologies de Lille, 59655 Villeneuve d’Ascq Cedex, France
b Laboratoire de Physico-Chimie des Processus de Combustion et de l’Atmosphère (UMR 8522), Centre d’Etudes et de Recherches Lasers et Applications (FR CNRS 2416), Université des Sciences et Technologies de Lille, 59655 Villeneuve d’Ascq Cedex, France |
| |
| Abstract: | Characterization of polycyclic aromatic hydrocarbons (PAHs) samples has been performed by laser desorption combined with multi-photon ionization technique using two different geometries of the ionization laser beam. This comparative study evidences the strong influence of ionization laser fluence on PAH fragmentation. Through a ∼103 enlargement of the ionization probe volume and 104 reduction of laser fluence over previous studies, fragment free mass spectra are obtained with higher sensitivity and selectivity. The ability to measure fragment free PAH mass spectra is a very important step in the end goal of measuring complex unknown mixtures of PAH desorbed from solid surface such as soot samples. |
| |
| Keywords: | 68.43.Tj 82.80.Rt 33.80.Rv |
| 本文献已被 ScienceDirect 等数据库收录！ |
