Electron spin echo envelope modulation due to exchange and dipolar interactions in a spin-correlated radical pair
✍ Scribed by Jau Tan; Marion C. Thurnauer; James R. Norris
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 655 KB
- Volume
- 219
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
The effects of exchange and electron-electron dipolar interactions on electron spin echo envelope modulation and free induction decay in a photo-induced spin-correlated radical pair are examined. Analytical expressions are derived for FID and spin echo signals as a two-dimensional function of the time intervals between the laser pulse and the microwave pulses. It is predicted that these interactions can induce deep modulation or oscillation on the out-of-phase spin echo envelope whereas the in-phase echo vanishes. The modulation frequencies provide useful information for systems with small exchange and dipolar interactions even if the hypertine inhomogeneity often produces unresolved spectra in cw EPR.