Ph.D. Theses

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2020-03-15
22:14
OpenAccess [PUBDB-2020-01054] Book/Report/Dissertation / PhD Thesis

Studying chiral molecules with broadband microwave spectroscopy
[DESY-THESIS-2020-004]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 204 pp. () [10.3204/PUBDB-2020-01054] = Dissertation, Universität Hamburg, 2019  GO
Natural essential oils are complex mixtures containing several compounds of structural similarity.They are well known for their wide range of applications in different areas, frommedicine to cosmetics. One of the conventional methods for their quantitative analysis is gaschromatography (GC). [...]
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2020-03-12
19:37
OpenAccess [PUBDB-2020-01029] Dissertation / PhD Thesis
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Enhancing x-ray diffactive imaging and optical microscopy by use of intensity correlations
204 pp. () [10.3204/PUBDB-2020-01029] = Dissertation, FAU Erlangen-Nürnberg, 2019  GO
In this thesis we propose intensity correlation enhanced imaging techniques in two major areas of imaging with light. The first area is diffractive imaging. [...]
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2020-03-12
19:26
OpenAccess [PUBDB-2020-01028] Dissertation / PhD Thesis
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Investigation of Ultrafast Molecular Dynamics via Covariance Mapping -A Tool for Intense XUV Light Sources
118 pp. () [10.3204/PUBDB-2020-01028] = Dissertation, Lund University, 2019  GO
The study of molecular dynamics involves observations of the motion of nuclei and electrons. While nuclear motion is usually on the picosecond or femtosecond timescale, attosecond precision is necessary to directly observe the motion of electrons. [...]
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2020-03-12
19:14
OpenAccess [PUBDB-2020-01027] Dissertation / PhD Thesis
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Ultrafast Photoionization Dynamics Studied with Coincidence Momentum Imaging Spectrometers
139 pp. () [10.3204/PUBDB-2020-01027] = Dissertation, Lund University, 2019  GO
The time scale of the dynamics in atoms and molecules varies from attoseconds (10-18) to picoseconds (10-12) depending on the size of the particles. To study such dynamics, ultrafast light pulses are needed to trigger and capture the reaction. [...]
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2020-03-12
19:00
OpenAccess [PUBDB-2020-01026] Dissertation / PhD Thesis
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Shape Resonances as a Probe of an Evolving Nuclear and Electronic Structure in Molecules
Freie Universität Berlin 176 pp. () [10.17169/REFUBIUM-1735] = Dissertation, FU Berlin, 2019  GO
Shape resonances are a ubiquitous phenomenon in electron–molecule scattering, in which the impinging electron is resonantly captured in a pseudo-bound state that is supported by the molecular potential. To study the electron scattering dynamics, we use time- and angle- resolved photoelectron spectroscopy here. [...]
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2020-03-12
18:53
OpenAccess [PUBDB-2020-01025] Dissertation / PhD Thesis
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Spektroskopické studium interakcí fokusovaného svazku rentgenového laseru s hmotou(The spectroscopy study of focused short-wavelength laser-matter interactions)
54 pp. () [10.3204/PUBDB-2020-01025] = Dissertation, Univerzita Karlova, Praha, 2019  GO
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2020-03-12
18:42
OpenAccess [PUBDB-2020-01024] Dissertation / PhD Thesis

Untersuchung der Expansionsdynamik einzelner Xenoncluster induziert durch hochintensive Lichtpulse aus dem Infrarot- und weichen Röntgenbereich
Technische Universität Berlin 160 pp. () [10.14279/DEPOSITONCE-8518] = Dissertation, TU Berlin, 2019  GO
Diese Arbeit beschäftigt sich mit den grundlegenden Prozessen, die hochintensive und kurze Lichtpulse in Nanopartikeln auslösen. Als Modellsystem werden Xenoncluster im Größenbereich von 20 bis 90\,nm im Radius verwendet. [...]
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2020-03-12
18:27
OpenAccess [PUBDB-2020-01023] Dissertation / PhD Thesis

Two-Color Pump-Probe Experiments on O$_2$ and N$_2$ at the Free-Electron Laser in Hamburg
Heidelberg University Library 145 pp. () [10.11588/HEIDOK.00026702] = Dissertation, University of Heidelberg, 2019  GO
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2020-03-05
10:05
OpenAccess [PUBDB-2020-00969] Book/Report/Dissertation / PhD Thesis

Measurement of the top quark mass in the all-jets final state at $\sqrt{s}=13$ TeV and combination with the lepton+jets channel
[DESY-THESIS-2020-003]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 189 pp. () [10.3204/PUBDB-2020-00969] = Dissertation, Universität Hamburg, 2020  GO
A measurement of the top quark mass using LHC proton-proton collision data with an integratedluminosity of $35.9\text{fb}^{-1}$ is presented.The dataset has been recorded with the CMS detector in LHC Run 2 at a center-of-mass energyof $13$ TeV in the 2016 data taking period.Events are selected in which a top quark and a top antiquark are produced and both decay exclusively to jets.This $\text{t}\overline{\text{t}}$ all-jets final state is characterized by six jets in the detector and therefore contaminatedby multijet background, which is estimated from data in a control region.A kinematic fit is utilized to reconstruct the full $\text{t}\overline{\text{t}}$ system, improving the invariant mass resolution forthe top quark candidates and at the same time reducing the multijet background by requiring a goodness-of-fit criterion.The top quark mass is extracted using the ideogram method, simultaneously constraining an additional jet energy scale factor(JSF) to reduce systematic uncertainties.The top quark mass is found to be $m_{\text{t}}=172.34\pm0.20\,\text{(stat+JSF)}\pm0.70\,\text{(syst)}$ GeV, agreeing well with previous measurements.Furthermore, a combined top quark mass measurement using the all-jets and lepton+jets final states simultaneously isperformed.For this, a combined likelihood including the events of both final states is constructed and the same mass extractionis applied as for the all-jets final state.The resulting measurement is $m_{\text{t}}=172.26\pm0.07\,\text{(stat+JSF)}\pm0.61\,\text{(syst)}$ GeV.This is the first time a top quark mass measurement combining both final states in a single likelihood functionis presented.The result is consistent with other measurements at the LHC.A global electroweak fit employing this measurement shows the importance of the top quark mass for consistency checksof the standard model of particle physics..
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2020-02-26
10:49
OpenAccess [PUBDB-2020-00885] Book/Report/Dissertation / PhD Thesis

Development of a test DAQ system for the CMS Phase-2 outer tracker upgrade
[DESY-THESIS-2020-002]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 117 pp. () [10.3204/PUBDB-2020-00885] = Dissertation, Universität Hamburg, 2020  GO
The CMS detector at the LHC is foreseen to experience a major upgrade in order to cope with increased radiation flux due to the high-luminosity operation phase of the accelerator. The CMS tracker will be replaced completely, introducing a new module concept in the outer part of the subsystem, which will exploit the strong magnetic field inside the CMS detector to select high transverse momentum particles locally and send the corresponding information to the triggering system thus enhancing the efficiency of the latter.In order to allow for module prototyping and production testing, an intermediate DAQ system, referred to as μDTC, was developed in the scope of this thesis. [...]
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