Coupling of desorption and photoionization processes in two-step laser mass spectrometry of polycyclic aromatic hydrocarbons |
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| Authors: | A Faccinetto K Thomson M Ziskind C Focsa |
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| Institution: | 1. Laboratoire de Physique des Lasers, Atomes et Molécules (UMR 8523), Centre d’Etudes et de Recherches Lasers et Applications (FR 2416), Université de Lille 1, 59655, Villeneuve d’Ascq cedex, France
2. Laboratoire de Physico-Chimie des Processus de Combustion et de l’Atmosphère (UMR 8522), Centre d’Etudes et de Recherches Lasers et Applications (FR 2416), Université de Lille 1, 59655, Villeneuve d’Ascq cedex, France
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| Abstract: | The response of polycyclic aromatic hydrocarbons (PAHs) to different desorption and ionization fluences has been investigated
in a laser desorption/multiphoton ionization/time-of-flight mass spectrometry scheme. The results evidence an intricate relationship
between the desorption and ionization steps, tentatively attributed to the amount of internal energy acquired by the desorbed
molecules. Different behaviors have been found for the various PAHs considered, leading to a parametric “signature” for each
species. Moreover, some insights on the fragmentation mechanism of the desorbed PAHs have been obtained, with possible interpretation
in the frame of a “ladder-switching” model. |
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| Keywords: | PACS" target="_blank">PACS 68 43 Tj 82 80 Rt 33 80 Rv |
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