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Laser surface interaction for the generation of heavy cations and nanoparticles and their gas-phase studies

Alsayed Ali, Mohamed Ali (2008) Laser surface interaction for the generation of heavy cations and nanoparticles and their gas-phase studies. PhD thesis, University of Rennes I - France.

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Official URL: https://catalogue.univ-rennes1.fr/

Abstract

In this thesis, we studied the recombination of the Azulene (C H ), Acenaphthene (C H ), Anthracene (C H ), and Pyrene (C H ) ions with electrons, with the FlaPI (Flowing Afterglow with Photo Ions) method. The ionic species in the flowing afterglow are spatially characterized by a quadrupole mass spectrometer and the electron concentration is measured by means of a movable Langmuir probe. We developed a new method L2DI (laser desorption / laser ionization) based on the FlaPI method for studying the recombination kinetics of much larger PAHs. We measured the PAH ions concentration decay in time in function of the presence of electrons. We assessed different methods for recovering the recombination rate coefficient. Preliminary results obtained with L2DI method is reported in this thesis. We used a CRESU (Cinétique de Réaction en Ecoulement Supersonique Uniforme) reactor to produce the nanoparticles of PAH molecules at low temperature, which are deposited onto surfaces. The samples were then analyzed ex-situ by AFM (Atomic Force Microscopy) in tapping mode. This method of characterization was tested previously by analyzing small soot particles generated by a diffusion flame and deposited onto mica surfaces.

Item Type:Thesis (PhD)
Subjects:Analytical Science > Microscopy and probe methods
Technology > Nanotechnology and environmental applications
Physical Science > Nanophysics
Technology > Nanotechnology and energy applications
Engineering > Nanotechnology applications in aeronautics & astronautics
Risk > Environment, health and safety aspects of nanotechnology
Material Science > Nanochemistry
ID Code:10458
Deposited By:Dr Mohamed Ali Alsayed Ali
Deposited On:05 Jan 2011 14:36
Last Modified:05 Jan 2011 14:36

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