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Showing result 1 - 5 of 9 essays matching the above criteria.

  1. 1. Atomic Structure Calculations Using Configuration-Interaction And Many-Body Perturbation Theory For Spectral Modelling Of Neutron Star Mergers : Example Of Ce I - Iv

    University essay from Uppsala universitet/Teoretisk fysik

    Author : Fredrik Plane; [2023]
    Keywords : Computational atomic physics; Atomic physics; Physics; Astronomy; Astrophysics; Neutron stars; Stars; Relativisitc atomic physics; Configuration-interaction; Perturbation theory; Many-body perturbation theory;

    Abstract : The binary neutron star merger of 2017 and its corresponding electromagnetic signature resembling that of a kilonova has been one of the most groundbreaking astrophysical occurrences in the last decade. Indications of r-process nucleosynthesis in this event presents new opportunities for learning about the astrophysical origin of heavy elements. READ MORE

  3. 2. Synthesis of a rotaxane with switchable lanthanide luminescence

    University essay from KTH/Organisk kemi

    Author : Anja Ramström; [2022]
    Keywords : mechanically interlocked molecules; supramolecular chemistry; luminescence; rotaxanes; lanthanides; mekaniskt sammankopplade molekyler; supramolekylär kemi; luminescens; rotaxaner; lantanider;

    Abstract : I rotaxaner följs förflyttningen av makrocykeln vanligtvis med 1H-NMR spektroskopi. Målet med detta projekt är i stället att utveckla ett system som möjliggör att förflyttningen av makrocykeln kan observeras med hjälp av luminiscerande lantanid emission. READ MORE

  4. 3. Dye sensitzation effects on lanthanide upconversion nanoparticles

    University essay from KTH/Fysik

    Author : Dag Albin Bäck; Andreas Jörgensen; [2022]
    Keywords : Dye sensitization; lanthanide upconversion nanoparticles; upconversion nanoparticles; UCNP; IR806;

    Abstract : In this report we studied the properties of the dye IR806 and possible mechanisms of the dye sensitization effect on ytterbium-erbium co-doped upconversion nanoparticles. We found that the dye IR806 has two primary emission peaks in the NIR spectral range at around 850 nm and at around 950 nm. READ MORE

  5. 4. Development of a Neutron Activation Analysis station at the Lund Ion Beam Analysis Facility

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

    Author : Josephine Lindsey-Clark; [2021]
    Keywords : Neutron Activation Analysis; NAA; European Spallation Source; ESS; Lund Ion Beam Analysis Facility; LIBAF; Gamma-Ray Spectra; Physics and Astronomy;

    Abstract : This report outlines the first stages of the development of the Neutron Activation Analysis station at the Lund Ion Beam Analysis Facility in the Division of Nuclear Physics, Lund University. The motivation for this project is to use the Neutron Activation Analysis detection technique for environmental monitoring around the European Spallation Source, soon to come into operation. READ MORE

  6. 5. Electronic Properties of Correlated Systems

    University essay from Uppsala universitet/Institutionen för fysik och astronomi

    Author : Raquel Esteban Puyuelo; [2016]
    Keywords : ;

    Abstract : The aim of this project is to become familiar with the Hubbard-corrected energy functionals used in density functional theory, which are needed to describe the electronic properties of strongly correlated systems. This study focuses on two systems, gadolinium and nickel oxide, as examples of a lanthanide and a transition metal oxide, respectively, for which the conventional approaches to Density Functional Theory such as Local Density Approximationor Generalized Gradient Approximation fail. READ MORE