Evidence of large-angle reorientation in supercooledo-terphenyl
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We study the reorientation process of a paramagnetic radical dissolved in supercooledo-terphenyl around and belowT g via the Electron Spin Resonance spectroscopy. The experimental results are at variance with the hypothesis of diffusive reorientation of the radical. Instead, the ESR lineshapes are fairly well reproduced by assuming that the radical reorientates via large angular jumps with a width Δϕ=80° −5° +10° . The results are compared with previous2H NMR studies.
PACS 61.40Amorphous materials, glasses
PACS 76.30.RnFree radicals
PACS 01.30.CcConference proceedings
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