Search for dissertations about: "kemisk fysik"

Showing result 1 - 5 of 100 swedish dissertations containing the words kemisk fysik.

  1. 1. Structure Modeling with X-ray Absorption and Reverse Monte Carlo: Applications to Water

    University dissertation from Stockholm : Department of Physics, Stockholm University

    Author : Mikael Leetmaa; Lars G M Pettersson; John Rehr; [2009]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; water structure; x-ray absorption; spectroscopy; diffraction; reverse monte carlo; XAS; EXAFS; XANES; RMC; TP-DFT spectrum calculations; NATURAL SCIENCES Physics; NATURVETENSKAP Fysik; kemisk fysik; Chemical Physics;

    Abstract : Water is an important substance. It is part of us, of our environment, and is a fundamental prerequisite for the existence of life as we know it. The structure of water is still, after over 100 years of research on the subject, however under debate. READ MORE

  2. 2. Dissociative recombination of organic molecular ions of relevance for interstellar clouds and Titan's upper atmosphere

    University dissertation from Stockholm : Department of Physics, Stockholm University

    Author : Erik Vigren; Wolf D. Geppert; Ian Sims; [2010]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Dissociative recombination; Astrochemistry; NATURAL SCIENCES Physics; NATURVETENSKAP Fysik; kemisk fysik; Chemical Physics;

    Abstract : This thesis presents experimental studies on the dissociative recombination (DR) of the organic molecular ions CD3CND+, CH2CHCNH+, CH3CH2CNH+, CD3CDO+, CH3CHO+ and DCOOD2+. The experiments were all performed at the heavy ion storage ring CRYRING at the Manne Siegbahn Laboratory in Stockholm, Sweden. READ MORE

  3. 3. 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

    University dissertation from Stockholm : Department of Physics, Stockholm University

    Author : Pantea Fathi; Wolf Geppert; Paul Scheier; [2019]
    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

  4. 4. BUILDING AN X-RAY PHOTOELECTRON SPECTROSCOPY ENDSTATION FOR OPERANDO STUDIES OF CATALYTIC CO AND COHYDROGENATION REACTIONS

    University dissertation from Stockholm : Department of Physics, Stockholm University

    Author : David Degerman; Anders Nilsson; Joachim Schnadt; [2019]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; kemisk fysik; Chemical Physics;

    Abstract : X-ray Photoelectron Spectroscopy (XPS) provides an element-specific surface sensitive probe of the chemical composition in a system, and is consequently one of the workhorses of surface science and catalysis research. The obtained information on the chemical and physical state of the catalyst and adsorbates is essential in the endeavor to achieve a fundamental understanding how chemical reactions are facilitated by the catalyst. READ MORE

  5. 5. Combined Quantum Mechanical and Molecular Dynamics study of paramagnetic complexes Towards an understanding of electronic spin relaxation

    University dissertation from Stockholm : Department of Physics, Stockholm University

    Author : Shehryar Khan; Michael Odelius; Jozef Kowalewski; Juha Vaara; [2018]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; molecular dynamics; quantum chemistry; zero-field splitting; kemisk fysik; Chemical Physics;

    Abstract : The prime objectives of contrast agents in Magnetic Resonance Imaging (MRI) is to accelerate the relaxation rate of the solvent water protons in the surrounding tissue. Paramagnetic relaxation originates from dipole-dipole interactions between the nuclear spins and the fluctuating magnetic field induced by unpaired electrons. READ MORE