Sökning: "stark shift"

Visar resultat 1 - 5 av 28 avhandlingar innehållade orden stark shift.

1. 1. Quantum-Confined Stark Effect in Artificially Made Quantum Well Structures

   Författare :Weiquan Chen; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : The objective of the work presented in this thesis is to study the quantum-confined Stark effect in differently shaped quantum well structures. This effect has shown great interest and significant applications in optoelectronic devices. Most of the studies and applications have focused on square quantum wells. LÄS MER

3. 2. Characterisation of Organic Dyes for Solid State Dye-Sensitized Solar Cells

   Författare :Ute Cappel; Anders Hagfeldt; Gerrit Boschloo; Udo Bach; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; energy alignment; hole conductor; injection; interface; perylene; photo-induced absorption; regeneration; spectroelectrochemistry; spiro-MeOTAD; Stark effect; titanium dioxide; Physical chemistry; Fysikalisk kemi; Physical Chemistry; Fysikalisk kemi;

   Sammanfattning : Energy from the sun can be converted to low cost electricity using dye-sensitized solar cells (DSCs). Dye molecules adsorbed to the surface of mesoporous TiO2 absorb light and inject electrons into the semiconductor. LÄS MER

4. 3. Industrial Dynamics and Regional Structural Change : Geographical Perspectives on Economic Evolution

   Författare :Martin Henning; Institutionen för kulturgeografi och ekonomisk geografi; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; agglomeration externalities; industrial dynamics; Regional system; structural change; Sweden; industry life cycle; technology shift;

   Sammanfattning : This thesis investigates the process of economic transformation taking place in Sweden since the mid 1970s. Especially, it is concerned with how and why benefits that firms and industries draw from regional co-location with other actors (agglomeration externalities) vary over stages of economic transformation. LÄS MER

5. 4. Dynamics of multiphoton processes in nonlinear optics and x-ray spectroscopy

   Författare :Ji-Cai Liu; Faris Gel'mukhanov; Richard Taieb; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; nonlinear optics; x-ray spectroscopy; multiphoton processes; pulse propagation; Atomic and molecular physics; Atom- och molekylfysik; Spectroscopy; Spektroskopi;

   Sammanfattning : New generations of ultrashort and intense laser pulses as well ashigh power synchrotron radiation sources and x-ray free electronlasers have promoted fast developments in nonlinear optics andx-ray spectroscopy.The new experimental achievements and the appearance of varieties of novelnonlinear phenomena call for further development of theories. LÄS MER

7. 5. Time Resolved Laser Spectroscopy of Rydberg States in Group IIIA and IIIA Elements

   Författare :Göran Jönsson; Fysiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : In this work radiative properties of neutral elements with one or two electrons outside closed subshells have been investigated. Using laser techniques in connection with atomic beams selective excitation of Rydberg states was performed. Most of the studied states were populated with two-step excitation. LÄS MER