Sökning: "Photoemission electron microscopy"

Visar resultat 16 - 20 av 24 avhandlingar innehållade orden Photoemission electron microscopy.

  1. 16. Second-generation High-Order Harmonic Sources — From CPA to OPCPA

    Författare :Piotr Rudawski; Atomfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Optical parametric chirped pulse amplification; Fysicumarkivet A:2014:Rudawski; Chirped pulse amplification; High-order harmonic generation; Attosecond pulse;

    Sammanfattning : This thesis presents two sources of extreme ultraviolet (XUV) radiation based on high-order harmonic generation (HHG) in gases. The sources were developed for experiments requiring high-flux harmonic beams or HHG pulses at high-repetition rate. These were used experimentally to image nano-scale objects. LÄS MER

  3. 17. Magnetic Order in Artificial Structures

    Författare :Unnar B. Arnalds; Björgvin Hjörvarsson; Sveinn Ólafsson; Vassilios Kapaklis; Hartmut Zabel; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : The topic of this thesis is the investigation of the magnetic properties of artificially created magnetic structures. Applying different characterization techniques, ranging from direct imaging methods to reciprocal space techniques, the properties of lithographically patterned arrays of magnetic thin film and multilayer elements are investigated by exploring their magnetic state, extending from the atomic scale up to collective ordering phenomena of nano-magnetic elements. LÄS MER

  4. 18. STM studies of overlayers on semiconductor or insulator surfaces

    Författare :Thorbjörn Jemander; Struan Gray; Linköpings universitet; []
    Nyckelord :;

    Sammanfattning : Scanning tunneling microscopy (STM) operated in ultra-high vacuum (UHV) has been used to study overlayers on semiconductor or insulator surfaces. The overlayers have been deposited by magnetron sputtering, thermal evaporation or by gas exposure, and the investigated material systems include Mo on MgO, Ni on SiC, Sn on Si(lll), C on Si(lO0) and O on Si(lll). LÄS MER

  5. 19. Small-molecule layers for devices -Evaporation growth and characterization of thin films

    Författare :Måns Andreasson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; PTCDA; molecular semiconductors; OLED; evaporation deposition; CuPc;

    Sammanfattning : Small-molecule layers for devices- Evaporation growth and characterization of thin filmsMåns AndreassonApplied Semiconductor PhysicsDepartment of Microtechnology and NanoscienceChalmers University of TechnologyAbstractOrganic semiconductors constitute a relatively recent group of materials available for the electronic device designer. Substantially cheaper production technologies and integration with plastic materials are anticipated. LÄS MER

  7. 20. 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