Il Nuovo Cimento D

, Volume 16, Issue 8, pp 1285–1289 | Cite as

Evidence of large-angle reorientation in supercooledo-terphenyl

  • F. Cianflone
  • C. Donati
  • D. Leporini
  • M. Giordano
Article

Summary

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 61.40

Amorphous materials, glasses 

PACS 76.30.Rn

Free radicals 

PACS 01.30.Cc

Conference proceedings 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. [1]
    J. Jäckle:Rep. Prog. Phys.,49, 171 (1986).CrossRefADSGoogle Scholar
  2. [2]
    D. Kivelson andS. Kivelson:J. Chem. Phys.,90, 4464 (1989).CrossRefADSGoogle Scholar
  3. [3]
    A. Gerschel: inMolecular Liquids, edited byA. Barnes, W. Orville-Thomas andJ. Yarwood,NATO ASI Series C, Vol.135 (Reidel, Boston, Mass., 1984).Google Scholar
  4. [4]
    Th. Dries, F. Fujara, M. Kiebel, E. Rössler andH. Sillescu:J. Chem. Phys.,88, 2139 (1988).CrossRefADSGoogle Scholar
  5. [5]
    L. J. Berliner (Editor):Spin Labeling: Theory and Applications (Academic, New York, N.Y., 1976).Google Scholar
  6. [6]
    M. Giordano, P. Grigolini, D. Leporini andP. Marin:Phys. Rev. A,28, 2474 (1983);Adv. Chem. Phys.,62, 321 (1985).CrossRefADSGoogle Scholar
  7. [7]
    E. N. Ivanov:Sov. Phys. JETP,18, 1041 (1964).Google Scholar

Copyright information

© Società Italiana di Fisica 1994

Authors and Affiliations

  • F. Cianflone
    • 1
  • C. Donati
    • 2
    • 3
  • D. Leporini
    • 1
    • 3
  • M. Giordano
    • 1
    • 3
  1. 1.P.zza Torricelli 2Dipartimento di Fisica dell'UniversitàPisaItaly
  2. 2.P.zza dei CavalieriScuola Normale SuperiorePisaItaly
  3. 3.U.d.r. di PisaINFMPisaItaly

Personalised recommendations