Sökning: "Spektroskopi"

Visar resultat 21 - 25 av 137 avhandlingar innehållade ordet Spektroskopi.

  1. 21. Spectroscopic Studies of the Elements Ba, Fe, Ga, In and Ru

    Författare :Hans Karlsson; Enheten för fysikalisk och teoretisk kemi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fourier transform spectroscopy; branching fractions; oscillator strengths; term analysis; hyperfine structure; barium; gallium; iron; indium; Condensed matter:electronic structure; ruthenium.; magnetic and optical properties; electrical; spectroscopy; relaxation; magnetic resonance; supraconductors; egenskaper elektriska; Kondenserade materiens egenskaper:elektronstruktur; magnetiska och optiska ; supraledare; magnetisk resonans; spektroskopi; Astronomy; space research; cosmic chemistry; Astronomi; rymdvetenskap; kosmisk kemi; Fysicumarkivet A:2002:Karlsson;

    Sammanfattning : New measurements of the elements Ba, Fe, Ga, In and Ru are reported. The analysis of barium contains new wavelengths, improved energy level values and new values of the ionization limit in both Ba I and Ba II. Oscillator strengths and radiative lifetimes in Fe II, as a part of the FERRUM project, are reported. LÄS MER

  3. 22. Molecular Trees for Collecting Sunshine -Monitoring and Controlling Energy Transfer in Dendrimers

    Författare :Jane Larsen; Kemisk fysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; magnetiska och optiska ; supraledare; magnetisk resonans; egenskaper elektriska; Kondenserade materiens egenskaper:elektronstruktur; supraconductors; magnetic resonance; relaxation; spectroscopy; Condensed matter:electronic structure; electrical; magnetic and optical properties; Kemi; Chemistry; Femtosecond transient absorption; Os-Ru metal ligand complexes; Cu-porphyrin-appended dendrimers; Zn-porphyrin-appended dendrimers; Annihilation; Energy transfer; Solar energy conversion; Artificial photosynthesis; Antenna systems; spektroskopi; Physical chemistry; Fysikalisk kemi; Photochemistry; Fotokemi; Femtosecond fluorescence anisotropy;

    Sammanfattning : A continuing use of fossil fuels will accelerate global warning and result in severe consequences for the environment and thereby also us. Development of alternative, sustainable and environmentally friendly energy sources is therefore crucial. One approach is to create an artificial photosynthetic system that converts sunshine into fuel (e.g. LÄS MER

  4. 23. Transmission Electron Microscopy of Semiconductor Nanowires

    Författare :Magnus Larsson; Centrum för analys och syntes; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Nanowires; magnetic resonance; supraconductors; magnetic and optical properties; electrical; Condensed matter:electronic structure; fasjämvikt; kristallografi; egenskaper termiska och mekaniska ; crystallography; phase equilibria; Kondenserade materiens egenskaper:struktur; akustik; Condensed matter:stucture; thermal and mechanical properties; optics; acoustics; Elektromagnetism; optik; Electromagnetism; Scanning Tunneling Microscopy; Nanomaterials; III-V Semiconductors; Transmission Electron Microscopy; Inorganic chemistry; Oorganisk kemi; relaxation; spectroscopy; Kondenserade materiens egenskaper:elektronstruktur; egenskaper elektriska; magnetiska och optiska ; supraledare; magnetisk resonans; spektroskopi; materialteknik; Material technology; Materiallära; Semiconductory physics; Halvledarfysik;

    Sammanfattning : Semiconductor nanowires are studied by using transmission electron microscopy (TEM) based methods in this work. In the first section, the growth mechanism of gallium arsenide nanowires grown by chemical beam epitaxy is investigated. The nanowires are epitaxially grown from a gallium arsenide substrate by using gold seed particles as catalysts. LÄS MER

  5. 24. Photoelectron Spectroscopy of Cuprates and Manganites

    Författare :Mats Leandersson; Lunds universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; HTSC; photoelectron spectroscopy; angle resolved photoemission; magnetoresistance; superconductivity; magnetic resonance; relaxation; spectroscopy; Kondenserade materiens egenskaper:elektronstruktur; magnetiska och optiska ; egenskaper elektriska; supraledare; magnetisk resonans; Physics; spektroskopi; resonant photoemission; Condensed matter:electronic structure; CMR; electrical; supraconductors; magnetic and optical properties; Fysik; Fysicumarkivet A:2000; Leandersson;

    Sammanfattning : Abstract In this thesis, the high temperature superconductors (HTSC) La2CuO4+x and Bi2Sr2CaCu2O8+d and the colossal magnetoresistive (CMR) La1-xSrxMnO3 have been studied by photoelectron spectroscopy. Techniques such as angular resolved photoemission (ARPES), resonant photoemission spectroscopy (RESPES) and x-ray absorption spectroscopy have been applied, using synchrotron radiation. LÄS MER

  7. 25. Dynamics of multiphoton processes in nonlinear optics and x-ray spectroscopy

    Författare :Ji-Cai Liu; Faris Gel'mukhanov; Richard Taieb; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; nonlinear optics; x-ray spectroscopy; multiphoton processes; pulse propagation; Atomic and molecular physics; Atom- och molekylfysik; Spectroscopy; Spektroskopi;

    Sammanfattning : New generations of ultrashort and intense laser pulses as well ashigh power synchrotron radiation sources and x-ray free electronlasers have promoted fast developments in nonlinear optics andx-ray spectroscopy.The new experimental achievements and the appearance of varieties of novelnonlinear phenomena call for further development of theories. LÄS MER