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Laser plasma induced ionization of volatile organic compounds: study of the processes and subsequent ion-molecule reactions by Fourier Transform ion cyclotron resonance mass spectrometry

Abstract : Gas phase ion/molecule reactions between laser produced positive or negative ions and organic molecules were studied by Fourier transform/ion cyclotron resonance/mass spectrometry. Pure metal, metal halide salts and silicone wafer targets were irradiated by laser pulse, and positive and negative ions as well as electrons were formed. Their reactivity towards volatile organic molecules was studied and reaction mechanisms established. Acetophenone were tested as a model molecule for reactions with metal and silicone cations. Reactivities of different cations were correlated to their electronic configuration and promotion energy. Established experimental procedure were applied for ionization and ion-molecule reactions of polyhalogenated molecules. Perfluorotributylamine molecules were left to react with 21 different elemental cations and reaction products and mechanisms were defined. Some other environmental polyhalogenated molecules (dichlorodifluoromethane, halothane and endosulfane) were ionized and detected by the same methods. As complementary ionization method, negative mode ionization (reactions) were studied. Three different ionizing projectiles : laser produced electrons and halide ions as well as fragment halide ions were used to ionize (react with) above mentioned molecules. Electron attachment mechanisms are concurrent to negative ion-molecule reactions
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https://hal.univ-lorraine.fr/tel-02002299
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Submitted on : Thursday, February 7, 2019 - 12:09:09 PM
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  • HAL Id : tel-02002299, version 1

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Suzana Martinovic. Laser plasma induced ionization of volatile organic compounds: study of the processes and subsequent ion-molecule reactions by Fourier Transform ion cyclotron resonance mass spectrometry. Physics [physics]. UPVM - Université Paul Verlaine - Metz, 1997. English. ⟨NNT : 1997METZ043S⟩. ⟨tel-02002299⟩

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