Sökning: "low-energy ions"

Visar resultat 21 - 25 av 33 avhandlingar innehållade orden low-energy ions.

1. 21. Tilted Foils Nuclear Spin Polarization at REX-ISOLDE

   Författare :Hans Törnqvist; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; beta-NMR; ISOLDE; tilted foils; particle scattering; post-acceleration; REX-ISOLDE; nuclear spin polarization; HIE-ISOLDE;

   Sammanfattning : This thesis will explain and summarize my work and involvement in experiments aimed at producing nuclear spin polarization of post-accelerated beams of ions with the tilted-foils technique at the REX-ISOLDE linear accelerator at CERN. Polarizing the nuclear spin of radioactive beams in particular may provide access to observables which may be difficult to obtain otherwise. LÄS MER

3. 22. Probing Atomic Scale Structure and Catalytic Properties of Cobalt Oxide Model Catalysts

   Författare :Alif Arman; Synkrotronljusfysik; []
   Nyckelord :catalysis; model systems; Co3O4 111 ; Co3O4 100 ; CoO 111 ; X-ray photoelectron spectroscopy; Scanning tunneling microscopy; Fysicumarkivet A:2017:Arman;

   Sammanfattning : Cobalt oxides are known to be active catalysts for a number of chemical reactions, but very little is known about the atomic scale processesresponsible for the activity. The research presented in this thesis is focused on obtaining an atomic scale understanding of the chemistry of wellcharacterizedcobalt oxide model catalyst surfaces consisting of pristine and defective CoO and Co3O4 thin films with the (111) and (100)terminations supported by Ag(100), Ir(100), and Au(111) single crystal surfaces. LÄS MER

4. 23. High Resolution Dielectronic Recombination Studies at CRYRING

   Författare :Zong Weiyong; Donald M Crothers; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik; Physics; fysik;

   Sammanfattning : The works presented in this thesis are based on experimental studies on dielectronic recombination (DR) at the Stockholm storage ring CRYRING. The experiments have taken full advantage of the low energy spread of the electron beam provided by the electron cooler of the ring. Energy resolution of 10-1eV at full width half maximum has been achieved. LÄS MER

5. 24. High Rate Electron Capture Dissociation Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

   Författare :Youri Tsybin; Per Håkansson; Ron M.A. Heeren; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; mass spectrometry; Fourier transform ion cyclotron resonance; peptides and proteins; ion-electron interaction; electron capture dissociation; infrared multiphoton dissociation; liquid chromatography; capillary electrophoresis; Fysik; Physics; Fysik;

   Sammanfattning : Advances in science and technology during the past decade have greatly enhanced the level of the structural investigation of macromolecules – peptides and proteins. Biological mass spectrometry has become one of the most precise and sensitive techniques in peptide and protein analysis. LÄS MER

7. 25. Electrolyte evaluation and engineering for the performance enhancement of electrochemical capacitors

   Författare :Mohammad Mazharul Haque; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; thermal charging; supercapacitors; Energy storage; ionic liquid; self-discharge; thermoionic system; redox-electrolyte; activated carbon; leakage current; liquid crystal;

   Sammanfattning : As a consequence of a fast-paced technological evolution along with the acknowledgment of utilizing clean and renewable energy resources over fossil fuels, the importance of energy storage devices is widely recognized. The electrochemical capacitor (EC), commonly known as a supercapacitor or ultracapacitor, is an energy storage device that is already being used in portable consumer electronics, electrification of transportation, and grid-level applications. LÄS MER