Sökning: "electron-impact"

Visar resultat 1 - 5 av 20 avhandlingar innehållade ordet electron-impact.

  1. 1. Electron impact dissociation of molecular ions at CRYRING

    Författare :Ahmed Al-Khalili; Ronald A Phaneuf; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; fysik;

    Sammanfattning : In this thesis, the electron impact dissociation of molecular ions has been studied using the ion storage ring CRYRING at Manne Siegbahn Laboratory in Stockholm, Sweden. The electron impact dissociation of molecular ions occurs via many processes, which lead to different charge states of the product fragments. LÄS MER

  3. 2. Electron-Impact Liquid-Jet Water-Window X-ray Sources

    Författare :Peter Anders Skoglund Lindberg; Hans M. Hertz; Oscar Tjernberg; KTH; []
    Nyckelord :TECHNOLOGY; TEKNIKVETENSKAP;

    Sammanfattning : This Thesis describes the development and characterization of a soft x-ray liquidjet-anode electron-impact source. With a water-jet target the primary emission is the O Kα line at 525 eV. This is close to the lower edge of the water-window, a spectral region lacking simple laboratory sources. LÄS MER

  4. 3. Liquid-Jet-Target Microfocus X-Ray Sources : Electron Guns, Optics and Phase-Contrast Imaging

    Författare :Tomi Tuohimaa; Hans M. Hertz; Stephen Wilkins; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; electron-impact; x-ray; brightness; liquid-jet-target; phase-contrast imaging; Engineering physics; Teknisk fysik;

    Sammanfattning : This Thesis describes the development of an electron-impact microfocus x-ray source and its application for phase-contrast imaging. The source is based on a novel, liquid-jet target concept. Stable and continuous operation can be achieved at substantially higher electron-beam power densities than conventional solid target based systems. LÄS MER

  5. 4. Soft X-rays and secondary electrons : Velocity measurements on the electron emission produced by soft X-rays and by electron impact

    Författare :Erik Rudberg; Stockholms högskola; []
    Nyckelord :;

    Sammanfattning : .... LÄS MER

  7. 5. Recombination and ionization of astrophysically abundant ions

    Författare :Michael Jr. Fogle; Reinhold Schuch; Daniel Savin; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; atomic data; plasma; Atomic and molecular physics; Atom- och molekylfysik;

    Sammanfattning : The electron-ion recombination and electron-impact ionization of several astrophysically abundant C, N, O, and Ni ions have been investigated using the synchrotron storage ring CRYRING. The recombination rate coefficients predominanty used in the analyses of emission line spectra and for ionization balance calculations are determined from isoelectronic fits and extrapolations of theoretical and limited experimental results available from the literature. LÄS MER