Sökning: "valence electrons"

Visar resultat 6 - 10 av 67 avhandlingar innehållade orden valence electrons.

1. 6. The effect of core-valence correlation on transition metal clusters and surfaces : a theoretical study

   Författare :Hans Åkeby; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : Ten studies, using the methods of quantum chemistry to study transition metal clusters and surfaces, are presented. The effect of including correlation between the core and valence-electrons are studied, both with an approximative operator and with the core-electrons explicitly correlated. LÄS MER

3. 7. Area Selective Chemical Vapor Deposition of Metallic Films using Plasma Electrons as Reducing Agents

   Författare :Hama Nadhom; Henrik Pedersen; Daniel Lundin; Kostas Sarakinos; Erwin Kessels; Linköpings universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : Metallic films are used to improve optical, chemical, mechanical, magnetic, and electrical properties and are therefore of high importance in many applications, from electronics and catalysis, environmental protection and health, to wearable and flexible electronic materials. Many of these applications, however, require that the metal films are deposited uniformly on topographically complex surfaces and structures. LÄS MER

4. 8. Multi-Electron Coincidence Studies of Atoms and Molecules

   Författare :Egil Andersson; Raimund Feifel; Jan-Erik Rubensson; Kiyoshi Ueda; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; multi-ionization; electron emission; time-of-flight spectroscopy; coincidence spectroscopy; core-valence ionization; synchrotron radiation; electron correlation; Atomic and molecular physics; Atom- och molekylfysik; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

   Sammanfattning : This thesis concerns multi-ionization coincidence measurements of atoms and small molecules using a magnetic bottle time-of-flight (TOF) spectrometer designed for multi-electron coincidence studies. Also, a time-of-flight mass spectrometer has been used together with the TOF electron  spectrometer for electron-ion coincidence measurements. LÄS MER

5. 9. Single-photon multiple ionisation of atoms and molecules investigated by coincidence spectroscopy : Site-specific effects in acetaldehyde and carbon dioxide

   Författare :Sergey Zagorodskikh; Raimund Feifel; Vitali Zhaunerchyk; Melanie Mucke; Maria Novella Piancastelli; Tom Field; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; acetaldehyde; carbon dioxide; xenon; electron correlation; double ionisation; triple ionisation; core-valence ionisation; site-specific Auger decay; multiple Auger decay; branching ratios; site-specific photodissociation; molecular rearrangement; time-of-flight multi-electron-ion coincidence spectroscopy; synchrotron radiation; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

   Sammanfattning : In this thesis, multiple ionisation processes of free atoms and molecules upon single photon absorption are studied by means of a versatile multi-electron-ion coincidence spectroscopy method based on a magnetic bottle, primarily in combination with synchrotron radiation. The latter offered the possibility to access not only valence but also core levels, revealing processes, which promote the target systems into different charge states. LÄS MER

7. 10. Alloy Design and Optimization of Mechanical Properties of High-Entropy Alloys

   Författare :Saad Ahmed Sheikh; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ductility; topologically closed-pack TCP and geometrically closed-pack GCP phase; alloy design; mechanical properties; High-entropy alloys; refractory high-entropy alloys; valence electron concentration;

   Sammanfattning : High-entropy alloys (HEAs) are described as alloys containing multi-principal elements in equal or close to equal atomic percentage. HEAs are considered as potential structural materials for high-temperature applications; where alloy design and optimization of mechanical properties is extremely critical. LÄS MER