Sökning: "UHV"

Visar resultat 11 - 15 av 42 avhandlingar innehållade ordet UHV.

1. 11. Interaction of C60 with transition metals for thin film applications

   Författare :Lars Norin; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chemistry; C60; transition metals; fulleride; carbide; epitaxy; Kemi; Chemistry; Kemi; Inorganic Chemistry; oorganisk kemi;

   Sammanfattning : The fullerene molecule C60 is known to undergo many different chemical reactions, including intercalation of alkali- and alkaline earth metals. Relatively little is still known about the reaction between transition metals and C60, and the objective of this thesis was therefore-to investigate the chemical interaction between C60 and some group IV-VI transition metals. LÄS MER

3. 12. Experimental femtosecond-laser based investigations of model catalytic surface reactions

   Författare :Kess Marks; Henrik Öström; Stefano Bonetti; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; kemisk fysik; Chemical Physics;

   Sammanfattning : In order to be able to design novel catalytic processes more efficiently, detailed understanding of the catalyst-reactant interaction and the dynamics of the microscopic reaction steps is needed. The present thesis aims to contribute to the fundamental understanding of catalyst reactant systems by means of experiments using model systems in Ultra High Vacuum (UHV). LÄS MER

4. 13. Alumina Thin Film Growth: Experiments and Modeling

   Författare :Erik Wallin; Ulf Helmersson; Denis Music; Linköpings universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Alumina; Reactive sputtering; Phase formation; Residual water; Surface adsorption; Density functional theory; Material physics with surface physics; Materialfysik med ytfysik;

   Sammanfattning : The work presented in this thesis deals with experimental and theoretical studies related to the growth of crystalline alumina thin films. Alumina, Al2O3, is a polymorphic material utilized in a variety of applications, e.g., in the form of thin films. LÄS MER

5. 14. Surface and Interface Phenomena Studied with Pd Metal-Oxide-semiconductor Structures : Adsorption, catalytic reactions, hydrogen sensing and Pd restructuring

   Författare :Mats Eriksson; Wolfgang Göpel; Linköpings universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : The electronic properties of palladium metal-oxide-semiconductor (Pd-MOS) structures are highly sensitive to hydrogen over a large pressure range. Such devices have been found useful in several applications, e.g. as a chemical sensing element in the so called electronic nose. LÄS MER

7. 15. Design and Construction of Low-Temperature Scanning Tunnelling Microscope for Spectroscopy

   Författare :Joakim Lindahl; Fasta tillståndets fysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; mechanical properties; thermophysical properties; stepper motor; ultra-high vacuum; inertial-mass; low temperatures; scanning tunneling microscopy; optical propertie; Fysik; Semiconductory physics; Physics; scanning tunneling luminescence; local probe; photon emission; local carrier injection; Halvledarfysik; Fysicumarkivet A:1998:Lindahl;

   Sammanfattning : This thesis discusses some of the fundamental requirements needed to be fulfilled when constructing a low temperature scanning tunnelling microscope (STM). Three different designs, two non-vacuum and one ultra-high vacuum (UHV), based on either inertial-mass or novel stepper motor principles are presented. LÄS MER