Search for dissertations about: "Wolf Geppert"

Showing result 1 - 5 of 9 swedish dissertations containing the words Wolf Geppert.

2. 1. Ion-neutral reactions of C2H2N+ with hydrocarbons : relevant to Titan’s ionosphere

   Author : Pantea Fathi; Wolf Geppert; Einar Uggerud; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; kemisk fysik; Chemical Physics;

   Abstract : To provide some insights on the formation of long-chain carbon-nitrogen bearing ions in Titan’s atmosphere, laboratory measurements of ion-neutral reactions were conducted and results are presented in the following licentiate thesis. The product ions of the C2H2N+ reaction with saturated and unsaturated neutral hydrocarbons have been studied using guided ion beam mass spectrometer (GIB-MS). READ MORE

4. 2. Synthesis of complex organics via molecular growth mechanisms : Combined experimental and theoretical studies on ion-neutral reactions of C2H2N+ with ubiquitous hydrocarbons in Titan's ionosphere

   Author : Pantea Fathi; Wolf Geppert; Paul Scheier; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Astrochemistry; Complex molecules; Ion-neutral reactions; Mass spectrometry; Planetary and satellite atmospheres; Titan; kemisk fysik; Chemical Physics;

   Abstract : To provide insights on the molecular growth mechanisms leading to large carbon and nitrogen-bearing species in Titan’s ionosphere, laboratory measurements of ion-neutral reactions were conducted and the results are presented in the following doctoral dissertation. The product ions of the C2H2N+ reactions with saturated and unsaturated neutral hydrocarbons have been investigated using Guided Ion Beam Mass Spectrometer (GIB-MS). READ MORE

5. 3. Dissociative Recombination of Astrochemically Interesting Ions

   Author : Mathias Hamberg; Wolf Geppert; Mats Larsson; Stephan Schlemmer; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Dissociative Recombination; Astrochemistry; Chemical physics; Kemisk fysik; kemisk fysik; Chemical Physics;

   Abstract : In this thesis the major work described concerns experimental determination of the dissociative recombination (DR) reaction for several molecular ions of astrochemical interest. DR is the process where an electron recombines with a molecular ion to form an excited neutral that disintegrates into two or more neutral fragments to release the gained excess energy. READ MORE

6. 4. Examination of Dissociative Recombination Processes of Importance for Astrochemically Evolving Interstellar Clouds

   Author : Matthias Hamberg; Wolf Geppert; Peder Royen; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Dissociative Recombination Astro Chemistry; Chemical physics; Kemisk fysik; kemisk fysik; Chemical Physics;

   Abstract : Each single moment a myriad of processes is taking place throughout the universe. A great deal of them has been found to be dissociative recombination (DR) reactions. In this thesis the major work described are related to experimental determination of reaction rates and how the reaction products splits up into their final fragments. READ MORE

7. 5. Anions from the lab to ionospheres

   Author : Fredrik Lindén; Wolf Geppert; Henning Zettergren; Henrik Cederquist; Olle Björneholm; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; kemisk fysik; Chemical Physics;

   Abstract : Anion processes have been in the focus of interest during the last decades, especially due to their importance in planetary ionospheres.  Previous observations done by the Cassini Plasma Spectrometer, detected a multitude of heavy neutral and ionic molecules in the ionosphere of Saturn's moon Titan. READ MORE