Sökning: "metastable states"

Visar resultat 1 - 5 av 43 avhandlingar innehållade orden metastable states.

  1. 1. Radiative lifetimes of bound excited states in anions : Measurements on long-lived metastable states in atomic anions

    Författare :Odd Magnar Hole; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; fysik; Physics;

    Sammanfattning : This thesis presents and discusses the results of measurements of the intrinsic lifetimes of bound excited anionic states. The results are valuable for evaluation of different theoretical models and computation methods and are compared to calculations when available. LÄS MER

  3. 2. Weak Atomic Interactions

    Författare :Peter Schef; Sven Mannervik; Juliet C. Pickering; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; metastable states; forbidden transitions; laser probing; hyperfine structure; LRDR; Atomic physics; Atomfysik;

    Sammanfattning : An atom or ion can change quantum state, usually through emission or absorption of a photon. The photon has the same energy as the energy difference between the states of the transition. The states, or energy levels, of an atom are quantized and light emitted, or absorbed, from the atom is therefore of specific wavelengths, giving spectral lines. LÄS MER

  4. 3. Exchange

    Författare :Lars A. Salmi; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; metastable helium; secondary electrons; surface states; overlayers; single-triplet conversion; Auger deexcitation; spin-polarization; exchange; Auger neutralization;

    Sammanfattning : .... LÄS MER

  5. 4. Metastable Alumina from Theory: Bulk, Surface, and Growth of κ-Al2O3

    Författare :Carlo Ruberto; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; density-functional theory; structure; cutting tools; plane waves; first principles; stability; one-dimensional electron gas; DFT; Tasker s rules; ionic crystals; polar surfaces; adsorption; pseudopotentials; Pauling s rules; bonding; surface states; TiC; ceramic materials;

    Sammanfattning : Aluminas are materials of high technological importance that show a fascinating structural flexibility, with a large amount of different phases (alpha, gamma, eta, delta, kappa, chi, ...) and phase transitions at relatively high temperatures. LÄS MER

  7. 5. Anomalous Spectral Lines in Space and Laboratory Plasmas - Studies with HST and CRYRING

    Författare :Henrik Hartman; Astronomi - Genomgår omorganisation; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; magnetic resonance; supraconductors; magnetic and optical properties; electrical; Condensed matter:electronic structure; strontium; titanium; CRYRING; iron; STIS; metastable levels; HST; RR Telesopii; Eta Carinae; line identification; fluorescence; forbidden lines; Atomic Spectroscopy; lifetime measurements; Astronomy; Astronomi; rymdvetenskap; cosmic chemistry; space research; spektroskopi; supraledare; magnetiska och optiska ; egenskaper elektriska; Kondenserade materiens egenskaper:elektronstruktur; magnetisk resonans; relaxation; spectroscopy; kosmisk kemi; Fysicumarkivet A:2003:Hartman;

    Sammanfattning : Eta Carinae is one of the most massive and luminous stars in the Galaxy. A huge bipolar nebula and an equatorial disk give the object a characteristic shape. Close to the star there are gas clouds, which emit intriguing emission line spectra. LÄS MER