Essays about: "photoionization"

Showing result 1 - 5 of 10 essays containing the word photoionization.

  1. 1. Towards the control of photo-ionization with electron wave-packet interferences

    University essay from Lunds universitet/Synkrotronljusfysik; Lunds universitet/Fysiska institutionen

    Author : Andreas Stokkeland; [2020]
    Keywords : XUV attosecond pulses; photoelectron distribution; photoionization; phase shift; electron wave-packet interference; infrared field; IR-field; frequency components; Fourier transform; XUV photons; frequency domain; Physics and Astronomy;

    Abstract : In this work the photoelectric effect is explored through simulations of the phase shift that an IR-field can induce into an electron wave packet and the photoelectron distribution over frequency components that is produced in the photoionization of an atom with a attosecond pulses made of XUV photons. The IR-field is sent along two attosecond pulses made of XUV photons towards a 3D momentum spectrometer were there is a gas that can be photoionized and the photoelectrons can be measured. READ MORE

  3. 2. Design and Commissioning of an Ionization Intensity Monitor

    University essay from Lunds universitet/Atomfysik; Lunds universitet/Fysiska institutionen

    Author : Hanna Berg; [2019]
    Keywords : Physics and Astronomy;

    Abstract : The dynamics of molecules and electrons takes place on timescales of femtoseconds and attoseconds, respectively. This requires ultrashort and intense extreme ultraviolet (XUV) pulses to be able to study them. READ MORE

  4. 3. Understanding interfaces in thin-film solar cells using photo electron spectroscopy. : Effect of post-deposition treatment on composition of the solar cell absorber.

    University essay from Uppsala universitet/Institutionen för fysik och astronomi

    Author : Henrik Hansson; [2019]
    Keywords : solar cell; P-N junction; CIGS; PES; cross section;

    Abstract : The increasing demand of renewable energy is the big driving force for the research and development of more efficient solar energy conversion solutions. Solar cells, which use the photovoltaic effect to convert the photon energy to electrical current, are an important solar energy conversion technique. READ MORE

  5. 4. Photoionization study using few attosecond pulses and coincidence imaging techniques

    University essay from Lunds universitet/Synkrotronljusfysik; Lunds universitet/Fysiska institutionen

    Author : Lisa Rämisch; [2019]
    Keywords : Laser spectroscopy; Attosecond Science; Electron Spectroscopy; Physics and Astronomy;

    Abstract : Photoionization is one of the most fundamental photoreactions that leads to the ejection of an electron and the formation of an ion. With the help of modern 3D momentum imaging spectrometers, the interplay between the time and frequency domain upon ionization is studied. READ MORE

  6. 5. Ionospheric model of comet 67P including the effect of solar EUV attenuation

    University essay from Uppsala universitet/Institutionen för fysik och astronomi; Uppsala universitet/Institutet för rymdfysik, Uppsalaavdelningen

    Author : Kilian Hikaru Scheutwinkel; [2018]
    Keywords : ionosphere; comet 67P CG; Rosetta;

    Abstract : Comets are the most active around their perigees. The increased outgassing can lead to a coma thick enough to effectively absorb the solar EUV radiation, which engenders a self-shielding comet nucleus and inner layers of the ionosphere. READ MORE