## Electron paramagnetic resonance studies of Heisenberg spin exchange in solutions of free radicals |

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### Contents

The Effect of Solvent on the Heisenberg | 63 |

Results of radical concentration | 77 |

Lineshape analysis | 82 |

12 other sections not shown

### Common terms and phrases

absence of exchange APADS aqueous solution calculated Chem chemical exchange CJex collision density determined diamagnetic dielectric constant dilute Dimethoxyethane dinitrobenzene dipolar interactions DTBN radical effect ELDOR electron spin Equation exchange frequency exchange interaction exchange studies experimental error experiments extinction coefficient Figure free radicals Gauss Heisenberg exchange hyperfine lines hyperfine splitting ion pairs K/Cp klystron KTCNE least squares fit Least Squares Slope line versus linear linewidth linewidth studies longitudinal relaxation micelles modulation nuclear spin order rate constant pentane Phys plot point dipole potassium carbonate pump klystron pyrex radical concentration sample tube second order rate Slope and Intercept solution of DTBN solution of PADS solution of TCNE solvent SPADS spectra spectrum spin concentration spin exchange rate splitting constant strong exchange Table TBAP TCNE TCNE":THF temperature tetracyanoethylene theory tion unpaired electron Valence Bond viscosity wave function weak exchange width zero