Search for dissertations about: "MASS-SPECTROMETER"

Showing result 1 - 5 of 67 swedish dissertations containing the word MASS-SPECTROMETER.

  1. 1. The Penning trap mass spectrometer SMILETRAP II and evaporative cooling of highly-charged ions

    Author : Matthias Hobein; Reinhold Schuch; David Lunney; Stockholms universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Penning trap; Precision mass spectrometry; Atomic mass; Highly-charged ions; Evaporative cooling; Coherent oscillation; Ion beam emittance; Atomic physics; Atomfysik; Physics; fysik;

    Abstract : Accurate mass values have wide-ranging applications in physics and metrology, allowing, for example, to test quantum electrodynamics and fundamental symmetries, to determine fundamental constants, and to establish weight standards. This thesis describes the new high-precision double-Penning trap mass spectrometer SMILETRAP II which aims at relative uncertainties in the mass determination of 10-10 and below. READ MORE

  2. 2. Atomic laser resonance ionization mass spectrometry

    Author : Lars Bengtsson; Chalmers University of Technology; []
    Keywords : resonacne ioniation spectroscopy; photoionization; resonant photoexcitaiton; time-of-flight mass spectrometer; resonance ionization mass spectrometry; laser ablation; isotope selectivity; RIMS; RIS;

    Abstract : .... READ MORE

  3. 3. Reactivity of Metal Clusters with Diatomic Molecules

    Author : Lotta Holmgren; Chalmers University of Technology; []
    Keywords : Nbn; cluster; reactivity; Rhn; NO; D2; CO; N2; laser vaporization; Wn; Nin; photoionization; time-of-flight mass spectrometer; ionization potential; Cun; O2; Vn;

    Abstract : The reactivity of transition-metal clusters, in the approximate size range 10-60 atoms, with diatomic molecules has been investigated. A pulsed beam of neutral clusters is produced by a laser-vaporization source and passed through a low-pressure reaction cell containing the reactive gas. READ MORE

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

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

  5. 5. 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 : NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; 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