Sökning: "FTS"
Visar resultat 1 - 5 av 12 avhandlingar innehållade ordet FTS.
1. NbN and NbTiN Hot Electron Bolometer THz Mixers
Sammanfattning : The thesis reports the development of Hot Electron Bolometer (HEB) mixers for radio astronomy heterodyne receivers in THz frequency range. Part of this work is the fabrication of HEB devices, which are based on NbN or NbTiN superconducting thin films (≤5 nm). They are integrated with wideband spiral or double-slot planar antennas. LÄS MER
2. Constructing and Commissioning HELIOS – A High Harmonic Generation Source for Pump-Probe Measurements with sub 50 fs Temporal Resolution : The Development of Experimental Equipment for Extreme Ultraviolet Spectroscopy
Sammanfattning : This thesis presents HELIOS, an in-house laboratory for time-resolved pump-probe spectroscopy with extreme-ultraviolet (XUV) probe radiation. A wide span of pump wavelengths can be generated using commercial laser equipment while XUV probe radiation is generated via a high harmonic generation process in a noble gas delivering probe photons with energies between 20 eV and 72 eV. LÄS MER
3. FTS Studies of diatomic molecules of supposed astrophysical interest
Sammanfattning : .... LÄS MER
4. Fourier transform and Vernier spectroscopy using optical frequency combs
Sammanfattning : Optical frequency comb spectroscopy (OFCS) combines two previously exclusive features, i.e., wide optical bandwidth and high spectral resolution, enabling precise measurements of entire molecular bands and simultaneous monitoring of multiple gas species in a short measurement time. LÄS MER
5. Measurements of oscillator strenghts in Zr II and Cr II
Sammanfattning : Experimental oscillator strenghts (f-values) for lines in Zr II and Cr II have been determined using branching fractions (BFs) and radiative lifetimes. Experimental log gf-values for 263 spectral lines in Zr II have been derived by combining previously measured lifetimes with new BFs measured on the Lund UV Fourier Transform Spectrometer (FTS). LÄS MER