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Visar resultat 1 - 5 av 124 avhandlingar som matchar ovanstående sökkriterier.

1. 1. Ionization of large molecules with short laser pulses

   Författare :Mikael Kjellberg; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fysik; Photoelectron spectroscopy; Momentum mapping imaging; thermal ionization; above threshold ionization; molecular fusion; fullerenes; polyaromatic hydrocarbons; femtosecond-laser.;

   Sammanfattning : The decay dynamics of fullerenes and polyaromatic hydrocarbons (PAH) after femtosecond-laser excitation have been studied experimentally by electron momentum mapping and mass spectrometry. The electron spectra of fullerenes and large PAH-molecules were found to be exponentially decreasing with energy without any distinct peaks outside the photon energy. LÄS MER

3. 2. Atomic laser resonance ionization mass spectrometry

   Författare :Lars Bengtsson; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; resonacne ioniation spectroscopy; photoionization; resonant photoexcitaiton; time-of-flight mass spectrometer; resonance ionization mass spectrometry; laser ablation; isotope selectivity; RIMS; RIS;

   Sammanfattning : .... LÄS MER

4. 3. Characteristics of laser-enhanced ionization (LEI) and laser- induced fluorescence (LIF) spectrometry

   Författare :Madelen Norberg; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; laser-induced flourescence; trace element analysis; flame; laser-enhanced ionization; graphite furnace;

   Sammanfattning : .... LÄS MER

5. 4. Laser ionization mass spectrometry as a method for chemical analysis of solids and surfaces

   Författare :Mats Andersson; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; multiphoton ionization; laser ionization; sputtering; mass spectrometry; surface analysis; quantitativa analysis;

   Sammanfattning : .... LÄS MER

7. 5. Nonlinear optical techniques for ultrafast laser diagnostics : Development of femtosecond LIF, LIGS, CARS and backward lasing

   Författare :Maria Ruchkina; Förbränningsfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; laser diagnostics; femtosecond laser; nonlinear interactions; ultrafast spectroscopy; multi-photon excitation; laser-induced fluorescence; rotational coherent anti-Stokes Raman spectroscopy; laser-induced grating spectroscopy; lasing; backward lasing technique; Fysicumarkivet A:2021:Ruchkina;

   Sammanfattning : The thesis work concerns development and application of four versatile nonlinear optical techniques, based on exploiting ultrashort laser pulses, for diagnostic purposes in gases and flames. The four techniques, all laser-based, are two-photon laser-induced fluorescence (TPLIF), hybrid femtosecond/nanosecond (fs/ns) rotational coherent anti-Stokes Raman scattering (fs/ns RCARS), fs-laser-induced grating spectroscopy (fs-LIGS), and backward lasing. LÄS MER