Sökning: "fine-structure"

Visar resultat 1 - 5 av 106 avhandlingar innehållade ordet fine-structure.

  1. 1. Fine Structure and semi ordered structures : Extended energy loss fine structure investigations of semi ordered materials

    Författare :Riitta Räty; Edward A Stern; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; fysik;

    Sammanfattning : This thesis is based on structure determinations of solid materials with Extended energy loss fine structure (EXELFS) analysis. In this method the ionisation edges of a material recorded in an electron microscope are studied. The focus is on different hard materials. LÄS MER

  3. 2. Photodetachment spectroscopy : negative ion bound states and resonances Gunnar Haeffler

    Författare :Gunnar Haeffler; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; electron correlation; electron affinity; shape resonance; fine structure; ion optics; photodetachment; resonance ionization spectroscopy RIS ; Wigner law; doubly excited state; Feshback resonance; negative ion; electron spectroscopy;

    Sammanfattning : .... LÄS MER

  4. 3. Three-dimensional mapping of fine structure in the solar atmosphere

    Författare :Vasco M. J. Henriques; Dan Kiselman; Göran Scharmer; Hector Socas-Navarro; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Sun; sunspots; Swedish 1-meter Solar Telescope; active regions; image processing; sunspot penumbra; Astronomy; astronomi;

    Sammanfattning : The effects on image formation through a tilted interference filter in a converging beam are investigated and an adequate compensation procedure is established. A method that compensates for small-scale seeing distortions is also developed with the aim of co-aligning non-simultaneous solar images from different passbands. LÄS MER

  5. 4. Extended fine structure and hyperfine structure studies using EXELFS and Mössbauer spectroscopy

    Författare :Stefan Csillag; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : .... LÄS MER

  7. 5. Studies of atomic environments in solids using EXtended Energy Loss Fine Structure, EXELFS

    Författare :Mohammad-Amirhamzeh Tafreshi; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Extended Energy Loss Fine Structure (EXELFS) is the modulations occurring at the high energy side of the ionisation edges in electron energy loss spectra. This structure turns out to be correlated to the number, distance, and type of nearby atoms as well as the inelastic mean free path for the ejected electrons, and disorder in distances from the excited atom to the atoms in an atomic shell around it. LÄS MER