Sökning: "photoionisation"

Visar resultat 1 - 5 av 12 avhandlingar innehållade ordet photoionisation.

  1. 1. Generation and metrology of ultrashort pulses and their application in attosecond science

    Författare :Lana Neoricic; Atomfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; ultrashort; filamentation; femtosecond; dispersion scan; RABBIT; photoionisation; attosecond; interferometry; pump-probe; spectroscopy; photoelectron; wavepacket; Fysicumarkivet A:2022:Neoricic;

    Sammanfattning : This thesis deals with the dynamical processes in atoms and small molecules initiated by the absorption of ultrashort, coherent light pulses. The studied phenomena takeplace on the femtosecond (1 fs = 10−15 s) and attosecond (1 as = 10−18 s) timescales and critically depend on the properties of the light fields that drive them. LÄS MER

  3. 2. Calculations of electronic properties of metal clusters, fullerenes and molecules adsorbed on surfaces

    Författare :Bo Wästberg; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; inverse photoemission; fullerenes; photoionisation; local density approximation; multiple scattering; shape resonances; x-ray absorption near-edge structure; chemisorption; clusters;

    Sammanfattning : .... LÄS MER

  4. 3. Computing attosecond delays in atomic photoionisation : A non-iterative method for many-electron correlation within the Random Phase Approximation with Exchange

    Författare :Anton Ljungdahl; Eva Lindroth; Jon Grumer; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Random phase approximation with exchange; attosecond physics; attosecond delays; teoretisk fysik; Theoretical Physics;

    Sammanfattning : När en atom absorberar fotoner, i växelverkan med tillräckligt högenergetisktljus, så kan en (eller flera) av atomens elektroner ”sparkas ut”. Det resulterar i en positivt laddad jon och en (eller flera) så kallade fotoelektroner. Den här processen är känd som den fotoelektriska effekten, men kallas också för fotojonisering. LÄS MER

  5. 4. Saturn's dusty equatorial ionosphere from Cassini's Grand Finale observations

    Författare :Joshua Dreyer; Erik Vigren; Lorenz Roth; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Saturn; Cassini; ionosphere; space plasma; planetary science; Fysik med inriktning mot rymd- och plasmafysik; Physics with specialization in Space and Plasma Physics;

    Sammanfattning : The Cassini mission provided unprecedented insights into the Kronian system and revealed many unexpected phenomena relating to dusty plasma environments around Saturn and its rings. Almost 13 years after its arrival, Cassini began a series of 22 orbits which brought it between Saturn's upper atmosphere and the innermost D ring, culminating in a final plunge into Saturn's ionosphere. LÄS MER

  7. 5. Synchrotron radiation studies of gas phase molecules : from hydrogen to DNA sugars

    Författare :Gemma Vall-llosera; Elisabeth Rachlew; Stacey Sorensen; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; KTH thesis; synchrotron radiation; gas phase; bio molecules; Atomic and molecular physics; Atom- och molekylfysik;

    Sammanfattning : This thesis summarises experimental results on the molecular spectroscopy of gas phase molecules excited by synchrotron radiation in the VUV and soft X-ray regions. We have used three different detection techniques, photon induced fluorescence spectroscopy, photoionisation mass spectroscopy and near edge X-ray absorption fine structure spectroscopy to study molecular deuterium, hydrogen sulphide, ammonia, methanol, pyridine, pyridazine, pyrimidine, pyrazine, s-triazine, and 2-deoxy-D-ribose, the last one also known as the DNA sugar. LÄS MER