Spin-polarized electron paramagnetic resonance spectra of radical pairs in micelles. Observation of electron spin-spin interactions

Journal Article · Thu Jun 18 04:00:00 EDT 1987 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100297a026· OSTI ID:6389020

Closs, G L; Forbes, M D.E.; Norris, Jr, J R

A model for polarized EPR spectra generated in radical pair reactions in micelles is being proposed. The model is based on electron spin-spin interactions which remain observable because of limited diffusion in micelles. The experimental observable is a doubling of hyperfine transitions, split by the magnitude of the interaction. The polarization is generated by the nonadiabatic generation of the radical pair with a triplet or singlet precursor. The time evolution of the wave function leads to a non-Boltzmann distribution of the populations among the four energy levels. The theory is tested by comparison with experiments, previously reported and repeated in this laboratory, obtained by laser flash photolysis of benzophenone in sodium dodecyl sulfate (SDS) micelles. Simulations of the shape of the spectra and their time dependence give excellent agreement with experiment. The model is further supported by experiments in micelles modified by different salt concentrations as well as different chain lengths of the micelle-forming molecules.

• Research Organization: Univ. of Chicago, IL
• OSTI ID: 6389020
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 91:13; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
COUPLING
DATA
ELECTRON SPIN RESONANCE
ENERGY LEVELS
EXPERIMENTAL DATA
FUNCTIONS
HYPERFINE STRUCTURE
INFORMATION
INTERMEDIATE COUPLING
J-J COUPLING
MAGNETIC RESONANCE
MATHEMATICAL MODELS
MICELLAR SYSTEMS
NUMERICAL DATA
RADICALS
RESONANCE
TIME DEPENDENCE
WAVE FUNCTIONS