Search for dissertations about: "Henrik Öström"

Showing result 1 - 5 of 7 swedish dissertations containing the words Henrik Öström.

2. 1. Chemical Bonding of Hydrocarbons to Metal Surfaces

   Author : Henrik Öström; Anders Nilsson; Phil Woodruff; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Adsorption; hydrocarbon; core-level; spectroscopy; Physics; Fysik;

   Abstract : Using x-ray absorption spectroscopy (XAS), x-ray emission spectroscopy (XES) and x-ray photoelectron spectroscopy (XPS) in combination with density functional theory (DFT) the changes in electronic and geometric structure of hydrocarbons upon adsorption are determined. The chemical bonding is analyzed and the results provide new insights in the mechanisms responsible for dehydrogenation in heterogeneous catalysis. READ MORE

4. 2. Going for gold : A spectroelectrochemical and catalytic study of gold materials

   Author : Sara Boscolo Bibi; Hansson Tony; Sergey Koroidov; Henrik Öström; Richard Kramer Campen; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Gold oxidation; oxide-derived metals; electrochemistry; X-ray spectroscopy; optical nonlinear spectroscopy; AuNPs supported in metal oxides; mass spectrometry; kemisk fysik; Chemical Physics;

   Abstract : With the increase in demand for renewable energy, understanding chemical processes is essential for improving the design of catalysts in order to achieve better performance. This thesis summarises the experimental investigation of three types of catalytic gold materials: gold oxide formed from gold films, oxide-derived gold (OD-Au) produced from gold films, and gold nanoparticles supported on metal oxides. READ MORE

5. 3. The role of knockout driven fragmentation in collision with isolated complex molecular systems

   Author : Linda Giacomozzi; Henning Zettergren; Henrik Öström; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Knockout processes; PAHs; HPAHs; porphyrins; fysik; Physics;

   Abstract : This licentiate thesis covers results from collision induced dissociation (CID) experiments of Polycyclic Aromatic Hydrocarbons (PAHs), hydrogentated PAHs (HPAHs) and porphyrins. PAHs and HPAHs are believed to play key roles in the evolution of complex molecules in space, while porphyrins are essential for various functions in living organisms. READ MORE

6. 4. Bonding and Desorption Mechanismsof CO on Metal Surfaces

   Author : Jörgen Gladh; Henrik Öström; Mats Götelid; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Bonding; Desorption; CO; Metal; kemisk fysik; Chemical Physics; fysik; Physics;

   Abstract : I have investigated two different systems CO/Fe(100) and CO/Ru(0001), toobtain new information on the binding and desorption processes. The twodifferent systems have served as a model system, one for a static examination,CO on iron, and for the dynamic case, CO on ruthenium. READ MORE

7. 5. Ultrafast Probing of CO Reactions on Metal Surfaces : Changes in the molecular orbitals during the catalysis process

   Author : Jörgen Gladh; Henrik Öström; Nils Mårtensson; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Hetrogenous catalysis; CO; transition metals; Ultrafast probing; oxidation; desorption; dissociation; kemisk fysik; Chemical Physics;

   Abstract : This thesis presents experimental studies of three different chemical reaction steps relevant for heterogeneous catalysis: dissociation, desorption, and oxidation. CO on single-crystal metal surfaces was chosen as the model systems. READ MORE