Sökning: "Electronic coherence"

Visar resultat 1 - 5 av 70 avhandlingar innehållade orden Electronic coherence.

  1. 1. Electronic and Vibrational Coherence in Photosynthetic and Model Systems

    Detta är en avhandling från Chemical Physics, Lund University

    Författare :Mirianas Chachisvilis; Lunds universitet.; Lund University.; [1996]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Kemi; Chemistry; Ultrafast relaxation; Porphyrins; Delocalization; Anisotropy; Wavepacket; Vibrational Coherence; Excitons; Electronic coherence; Energy transfer; Femtosecond spectroscopy; Photosynthesis;

    Sammanfattning : Ultrafast optical response and excitation energy dynamics in light harvesting pigment-protein complexes and in a few model systems have been studied both experimentally and theoretically. Femtosecond light pulses were employed to excite the system and monitor the subsequent time evolution of the transient absorption kinetics and anisotropy. LÄS MER

  2. 2. Episodes in talk : Constructing coherence in multiparty conversation

    Detta är en avhandling från Linköping : Linköping University Electronic Press

    Författare :Natascha Korolija; Linköpings universitet.; Linköpings universitet.; [1998]
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Coherence; episode; context; multiparty conversation; activity type; communicative impairments; radio talk; dinner conversation; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP;

    Sammanfattning : This study contributes to an understanding of how coherence can be assigned or constructed by participants in authentic multiparty conversational interaction. Coherence is analysed as a type of organisation relevant for the making of meaning in situated interaction, but also in retrospect from a third party's (or analyst's) perspective; it is both constructed and reconstructed. LÄS MER

  3. 3. Partially Coherent Laser Radiation - Modeling and Application to Optical Microlithography

    Detta är en avhandling från Linköping : Linköping University Electronic Press

    Författare :Christer Rydberg; [2006]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; microlithography; coherence; temporal speckle; partial coherence; optical propagation; number of degrees of freedom; dynamic speckle;

    Sammanfattning : This work deals with a type of light that has properties somewhere between blackbody radiation and conventional laser light; such light is referred to as partially coherent. One example is the radiation from the pulsed excimer laser, which is used in the manufacturing of most of the worlds integrated circuits. LÄS MER

  4. 4. Quantum Coherence and Quantum-Vacuum Effects in Some Artificial Electromagnetic Media

    Detta är en avhandling från Stockholm : KTH

    Författare :Jianqi Shen; KTH.; [2009]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Quantum coherence; quantum vacuum; electromagnetically induced transparency; negative refractive index; artificial electromagnetic media; electric- and magnetic-dipole transitions; multilevel atomic vapors; transient evolution; TECHNOLOGY Electrical engineering; electronics and photonics; TEKNIKVETENSKAP Elektroteknik; elektronik och fotonik;

    Sammanfattning : The author of this thesis concentrates his attention on quantum optical properties of some artificial electromagnetic media, such as quantum coherent atomic vapors (various multilevel electromagnetically induced transparency vapors) and negative refractive index materials, and suggests some possible ways to manipulate wave propagations inside the artificial electromagnetic materials based on quantum coherence and quantum vacuum effects. In Chapters 1 and 2, the author reviews the previous papers on quantum coherence as well as the relevant work such as electromagnetically induced transparency (EIT), atomic population trapping and their various applications. LÄS MER

  5. 5. Quantum Coherence for Light Harvesting

    Detta är en avhandling från Chemical Physics, Lund University

    Författare :David Palecek; Lunds universitet.; Lund University.; [2015]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Coherent two-dimensional spectroscopy; Quantum coherence; Light harvesting; Photosynthetic reaction center; Energy transfer;

    Sammanfattning : Popular Abstract in English The main reason that we humans exist at all is because of photosynthesis. The food we eat, the oxygen we breath, most of the energy that warms our homes and powers our electronics are all products of photosynthesis. LÄS MER