Search for dissertations about: "selective excitation"

Showing result 1 - 5 of 46 swedish dissertations containing the words selective excitation.

  2. 1. Tuning electron transfer reactions by selective excitation in porphyrin-acceptor assemblies

    Author : Mikael Andersson; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik; Physics; Fysik; Physical Chemistry; fysikalisk kemi;

    Abstract : This thesis concerns electron transfer reactions from different excited states in porphyrins, and the effect of changing the energy of the link connecting the donor and acceptor. Photoinduced electron transfer, and subsequent processes were studied using ultrashort laser pulses and nanosecond laser flash photolysis. READ MORE

  4. 2. Atomic and molecular properties probed by selective excitation of fast ion beams

    Author : Lars Broström; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : .... READ MORE

  5. 3. The Invasion of the Zebra Mussel - Effects on Phytoplankton Community Structure and Ecosystem Function

    Author : Rahmat Naddafi; Kurt Pettersson; Peter Eklöv; Willem Goedkoop; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Invasive species; Zebra mussel; Invasion success; Selective feeding; Non-lethal effects of predator; Seston stoichiometry; Delayed fluorescence excitation spectroscopy; Phytoplankton dynamics; Trait-mediated indirect interaction; Ecosystem function;

    Abstract : Biological invasion has become a major threat to economy, ecology, global biodiversity and ecosystem function of aquatic ecosystems. The main aim of the thesis was to study the effects of the zebra mussel (Dreissena polymorpha), a versatile invasive species, on phytoplankton dynamics and ecosystem function of lakes. READ MORE

  6. 4. Dissociation dynamics of highly excited molecules: Theory and Experiment

    Author : Shabnam Oghbaie; Synkrotronljusfysik; []
    Keywords : Molecular dissociation; core-electron excitation; double ionization; femtoseconds molecular dynamics; Isomerization; symmetry breaking; momentum imaging; site-selective dissociation; butadiene; cyclopropane; nuclear dynamics; Auger decay;

    Abstract : This thesis presents studies on dissociation of two model molecules: Butadiene and Cyclopropane. Tunable synchrotron radiation was used to ionize or excite the molecules in the gas phase, and the momentum correlation of the resulting fragment ions were measured using a 3D momenta coincident ion spectroscopy. READ MORE

  7. 5. An investigation of the radiation chemistry of a hydrocarbon system and simulation of ESR spectra of triplet state molecules

    Author : Ola Claesson; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Radiation chemistry; isotope effects; energy transfer; selective straction; spectrum simulation;

    Abstract : This thesis can be divided into two parts.The aim of the studies described in the first part of the thesis isto make clear the dominating processes in the selective decorrpositionof certain solutes that follow low-terrperature radiolysis of crystalline hydrocarbons.1. READ MORE