OD ESR line inversion in viscous solution. Indication of ST_ mechanism of radical ion pair recombination

✍ Scribed by B.M. Tadjikov; O.A. Anisimov; Yu.N. Molin

• Book ID: 103035088
• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 600 KB
• Volume: 208
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(93)80072-w

✦ Synopsis

The optically detected ESR spectra (OD ESR) of naphthalene radical ion pairs in squalane show inversion near the glass formation point of the solvent. A similar inversion of OD ESR spectra is also observed for some other additives, such as biphenyl and tetrafluorobenzene in glassy nonpolar solvents (squalane, 3-methylpentane). A theory of radical pairs can be used to account for the observed inversion of signal amplitude as a result of adiabatic passage of the anticrossing point of radical pair S and T_ levels upon counter ion recombination. The comparison between the shapes of experimentally observed and theoretically calculated spectra qualitatively cont%m this hypothesis.