Sökning: "quantum resonances"

Visar resultat 6 - 10 av 50 avhandlingar innehållade orden quantum resonances.

  1. 6. Extremal eigenvalues and geometry of quantum graphs

    Författare :Andrea Serio; Pavel Kurasov; Annemarie Luger; Evans Harrell; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; quantum graphs; spectral estimates; trace formula; Euler characteristic; Mathematics; matematik;

    Sammanfattning : This thesis consists of four papers concerning topics in the spectral theory of quantum graphs, which are differential operators on metric graphs.In paper I we present a family of graphs with an arbitrary number of cycles for which a certain eigenvalue upper estimate is sharp. LÄS MER

  3. 7. Resonances in Three-Body Systems

    Författare :Muhammad Umair; Svante Jonsell; Yasushi Kino; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; teoretisk fysik; Theoretical Physics;

    Sammanfattning : Three particles interacting via Coulomb forces represent a fundamental problem in quantum mechanics with no known exact solution. We have investigated resonance states composed of three particles interacting via Coulombic and more general potentials in non-relativistic quantum mechanics, using the complex scaling method. LÄS MER

  4. 8. Resonances in three-body systems

    Författare :Muhammad Umair; Svante Jonsell; Michael Odelius; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; teoretisk fysik; Theoretical Physics;

    Sammanfattning : Three particles interacting via Coulomb forces represents a fundamental problem in quantum mechanics whose approximate solution provides some insight into the more complex analysis associated with few-body problems. We have investigated resonance states composed of three particles interacting via Coulombic and more general potentials in non-relativistic quantum mechanics, using the complex scaling method. LÄS MER

  5. 9. A Theoretical Study of Atomic Trimers in the Critical Stability Region

    Författare :Moses Salci; Nils Elander; Sergey Levin; Gunnar Nyman; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; atomic trimers; halos; quantum resonances; finite element method; Physics; Fysik;

    Sammanfattning : When studying the structure formation and fragmentation of complex atomic and nuclear systems it is preferable to start with simple systems where all details can be explored. Some of the knowledge gained from studies of atomic dimers can be generalised to more complex systems. LÄS MER

  7. 10. On the formation of small molecules by radiative association

    Författare :Sergey V. Antipov; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; molecule formation; diatomics; radiative association; resonances; cross sections; rate coefficients;

    Sammanfattning : This thesis is devoted to the theoretical investigation of radiative association, which is one of the processes contributing to formation of molecules in the interstellar medium. The formation of the CN, SiN, SiP and CO molecules through radiative association of the corresponding atoms in their ground electronic states is studied by the means of classical and quantum dynamical calculations. LÄS MER