Excited state energy transfer studies using electron spin coherence

Technical Report · Wed Jun 23 00:00:00 EDT 1976

OSTI ID:7140917

Brock, J C

The use of electron spin coherence techniques for examining the dynamics of excited states subject to energy transfer processes is described. Equations detailing the time evolution of a coherently coupled two-level system are presented and developed to include the effects of feeding and decay processes on coherence induced in an excited state ensemble. Various mechanisms responsible for a loss of phase coherence in an excited state ensemble are identified and discussed, including the effects of energy exchange between systems that are not translationally equivalent. Also described is electron spin ordering, a new approach for examining electronically excited states. A model incorporating kinetic features of excited state ensembles is developed to characterize the decay of the ordered state for both on and off resonance applications. Spinlocking and electron spin ordering are used to study exciton transport between localized isotopic impurity states via the one-dimensional triplet exciton band of 1,2,4,5 d/sub 2/-tetrachlorobenzene. Measurements of the rate constant for trap to trap migration as a function of both temperature and trap concentration are presented, along with a model for calculating the quantum yield of excitons that migrate to different trap sites upon thermal promotion.

• Research Organization: California Univ., Berkeley (USA). Lawrence Berkeley Lab.
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 7140917
• Report Number(s): LBL-5189
• Country of Publication: United States
• Language: English

Related Subjects

656000* -- Condensed Matter Physics
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANGULAR MOMENTUM
ATOMS
COUPLING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
ELECTRONS
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY TRANSFER
EXCITED STATES
EXCITONS
FERMIONS
LEPTONS
PARTICLE PROPERTIES
QUASI PARTICLES
SPIN