Search for dissertations about: "wavelengths"

Showing result 1 - 5 of 333 swedish dissertations containing the word wavelengths.

  2. 1. Measurements of High-Precision Atomic Data with Applications to Astrophysics and Cosmology

    Author : Maria Aldenius; Astronomi - Genomgår omorganisation; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; atomic data; Ca; Cr; Fe; Mn; Mg; metal-poor stars; fine-structure constant; Fourier transform spectroscopy; nebulae; oscillator strengths; spectroscopy; wavelengths; Ti; Zn; Astronomy; Astronomi; Atomic and molecular physics; Atom- och molekylärfysik; rymdvetenskap; space research; cosmic chemistry; kosmisk kemi; branching fractions;

    Abstract : Investigations of astrophysical spectra require accurate atomic data, such as wavelengths and transition probabilities. This thesis provides high-precision atomic data for astrophysical and cosmological applications. The measurements have been carried out using Fourier transform spectrometry on light produced in a hollow cathode light source. READ MORE

  4. 2. Astrochemistry at Millimetre and Submillimetre Wavelengths

    Author : Eva Wirström; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Astrobiology - Astrochemistry - ISM: abundances - ISM: molecules - Submillimetre;

    Abstract : The focus of this thesis is a series of observational tests, aiming to clarify the chemical and physical origin of interstellar molecules. Spectral lines at millimetre and submillimetre wavelengths, caused by rotational transitions in CO, H2O, NH3, CH3OH, CH3SH, C2H3CN, and several of their isotopologues, have been observed towards regions of star-formation in the Galaxy. READ MORE

  5. 3. Semiconductor Quantum Optics at Telecom Wavelengths

    Author : Katharina Zeuner; Val Zwiller; Klaus D. Jöns; Stephan Reitzenstein; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Optik och fotonik; Optics and Photonics;

    Abstract : Quantum technologies are an expanding field in physics and engineering concerning the development of protocols and devices that enable augmented or novel applications based on quantum mechanics. This includes amongst others quantum computation and quantum communication. READ MORE

  6. 4. Multilayer X-ray mirrors for water window wavelengths

    Author : Fredrik Eriksson; Linköpings universitet; []
    Keywords : ;

    Abstract : This thesis describes the design, growth and x-ray characterization of normal incidence multilayer x-ray mirrors. The mirrors are intended as condenser optics for soft x-ray microcsopy in the water window.A droplet-target laser-plasma soft x-ray source has been developed to be used in a compact soft x-ray microscope. READ MORE

  7. 5. Stacking of interferometric data at sub-millimeter and radio wavelengths

    Author : Lukas Lindroos; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; techniques: interferometric; methods: data analysis; sub-millimetre: galaxies; galaxies: high- redshift; radio continuum: galaxies;

    Abstract : Understanding the procceses of galaxy evolution require observational constraints on the physical properties of galaxies at different times in the history of the Universe. Large and deep surveys at visible and near-infrared wavelengths have, during the past decade, been used to produce extensive catalogues of high-redshift galaxies, spanning a large range of the history of the Universe. READ MORE