@phdthesis{Arndt2020,
  author    = {Arndt, Mario},
  title     = {Die portugiesisch-basierten Kreolsprachen S{\"u}dostasiens im Sprachkontakt},
  series = {Sprachkontakte. Variation, Migration und Sprachdynamik / Language contacts. Variation, migration and dynamics of languages / Contacts linguistiques. Variation, migration et dynamique linguistique ; 5},
  journal   = {Sprachkontakte. Variation, Migration und Sprachdynamik / Language contacts. Variation, migration and dynamics of languages / Contacts linguistiques. Variation, migration et dynamique linguistique ; 5},
  publisher = {Peter Lang GmbH},
  address   = {Frankfurt am Main},
  isbn      = {978-3-631-82570-9},
  issn      = {1868-176X},
  doi       = {10.3726/b17106},
  pages     = {311},
  year      = {2020},
  abstract  = {Ein Ergebnis der interkulturellen Beziehungen in S{\"u}dostasien sind die immer noch existierenden portugiesisch-basierten Kreolsprachen Papia Kristang und Maca{\´i}sta, die zu Muttersprachen von Generationen von Menschen in Malakka und Macau geworden sind. Welche Faktoren bewirken den Sprachwandel dieser Idiome, und wie ist dieser erkennbar? Dieser Band besch{\"a}ftigt sich nicht nur mit der Sprachdynamik der portugiesisch-basierten Kreolsprachen S{\"u}dostasiens, sondern auch mit anderen wesentlichen Fragestellungen der Variationslinguistik. Als Basis dienen die Ergebnisse einer empirischen Datenerhebung, die insbesondere die Ver{\"a}nderungen im Sprachgebrauch dokumentieren. Dar{\"u}ber hinaus stellt der Autor neue Resultate hinsichtlich der Sprachidentifikationen vor, die nicht nur f{\"u}r die Kreolistik von Bedeutung sind, sondern auch fach{\"u}bergreifend f{\"u}r das Interesse der allgemeinen Sprachwissenschaft.},
  language  = {de}
}
@phdthesis{Lever2022,
  author    = {Lever, Fabiano},
  title     = {Probing the ultrafast dynamics of 2-Thiouracil with soft x-rays},
  doi       = {10.25932/publishup-55523},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-555230},
  school      = {Universit{\"a}t Potsdam},
  pages     = {129},
  year      = {2022},
  abstract  = {Understanding the changes that follow UV-excitation in thionucleobases is of great importance for the study of light-induced DNA lesions and, in a broader context, for their applications in medicine and biochemistry. Their ultrafast photophysical reactions can alter the chemical structure of DNA - leading to damages to the genetic code - as proven by the increased skin cancer risk observed for patients treated with thiouracil for its immunosuppressant properties. In this thesis, I present four research papers that result from an investigation of the ultrafast dynamics of 2-thiouracil by means of ultrafast x-ray probing combined with electron spectroscopy. A molecular jet in the gas phase is excited with a uv pulse and then ionized with x-ray radiation from a Free Electron Laser. The kinetic energy of the emitted electrons is measured in a magnetic bottle spectrometer. The spectra of the measured photo and Auger electrons are used to derive a picture of the changes in the geometrical and electronic configurations. The results allow us to look at the dynamical processes from a new perspective, thanks to the element- and site- sensitivity of x-rays. The custom-built URSA-PQ apparatus used in the experiment is described. It has been commissioned and used at the FL24 beamline of the FLASH2 FEL, showing an electron kinetic energy resolution of ∆E/E ~ 40 and a pump-probe timing resolution of 190 f s. X-ray only photoelectron and Auger spectra of 2-thiouracil are extracted from the data and used as reference. Photoelectrons following the formation a 2p core hole are identified, as well as resonant and non-resonant Auger electrons. At the L 1 edge, Coster-Kronig decay is observed from the 2s core hole. The UV-induced changes in the 2p photoline allow the study the electronic-state dynamics. With the use of an Excited-State Chemical Shift (ESCS) model, we observe a ultrafast ground-state relaxation within 250 f s. Furthermore, an oscillation with a 250 f s period is observed in the 2p binding energy, showing a coherent population exchange between electronic states. Auger electrons from the 2p core hole are analyzed and used to deduce a ultrafast C -S bond expansion on a sub 100 f s scale. A simple Coulomb-model, coupled to quantum chemical calculations, can be used to infer the geometrical changes in the molecular structure.},
  language  = {en}
}