Sökning: "Emission spectra"

Visar resultat 1 - 5 av 171 avhandlingar innehållade orden Emission spectra.

  1. 1. Photospheric emission from structured, relativistic jets : applications to gamma-ray burst spectra and polarization

    Författare :Christoffer Lundman; Felix Ryde; Andrei Beloborodov; KTH; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; gamma-ray bursts; photospheric emission; radiative processes; polarization; special relativity;

    Sammanfattning : The radiative mechanism responsible for the prompt gamma-ray burst (GRB) emission remains elusive. For the last decade, optically thin synchrotron emission from shocks internal to the GRB jet appeared to be the most plausible explanation. LÄS MER

  2. 2. X-ray emission spectra of free molecules

    Författare :Joseph Nordgren; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP;

    Sammanfattning : .... LÄS MER

  3. 3. Excitation and Ground-State Properties of Natural and Modified Nucleic Acid Bases

    Författare :Anders Holmén; Chalmers University of Technology; []
    Nyckelord :ab initio; linear dichroism; DFT; transition moment; tautomerism; structure; IR; spectra; DNA bases;

    Sammanfattning : The nucleic acid bases are the carriers of genetic information in DNA and RNA. They are also the main chromophores of nucleic acids and determine their optical properties and sensitivity to UV radiation. LÄS MER

  4. 4. VUV Emission and Energy Transfer Phenomena in Rare Gas Mixture Discharges

    Författare :Andrei Morozov; Andreas Ulrich; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; Physics; VUV spectra; excimers; energy transfer; rare gas discharges; Fysik; Physics; Fysik; fysik; Physics;

    Sammanfattning : VUV emission spectra of Xe-X (X = He, Ne, Ar and Kr) and of Kr-Y (Y = He, Ne and Ar) mixtures with low concentrations of the heavier gases (0.1 - 1 %) and moderate total pressures (50 - 200 hPa) are recorded near each of the two resonance lines of Xe and Kr in DC glow capillary discharges. LÄS MER

  5. 5. Photospheric emission in gamma-ray bursts

    Författare :Christoffer Lundman; Felix Ryde; Stephan Rosswog; KTH; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : This thesis considers emission from gamma-ray bursts (GRBs), the most powerful explosions known in the Universe. Most GRBs are likely associated with the final stages of stellar evolution, where the core of a massive star collapses, and gives birth to a highly compact object such as a neutron star or black hole. LÄS MER