Reorientational dynamics of solid C70 probed by positive muons

Roderick M. Macrae, Kosmas Prassides, Ian M. Thomas, Emil Roduner, Christof Niedermayer, Ulrich Binninger, Christian Bernhard, Anselm Hofer, Ivan D. Reid

研究成果: Article査読

23 被引用数 (Scopus)

抄録

The dynamics of muonium (Mu) adducts to C70 in the crystalline state have been studied using zero-field muon spin relaxation (ZF-μSR) and avoided level crossing muon spin resonance (ALC-μSR) spectroscopy. The two techniques are sensitive to complementary ranges of temperature and together give a complete and consistent picture of the molecular motion. The behavior of the MuC70 radicals which are characterized by a prolate hyperfine matrix with components Dxx = -6.8(2) MHz, Dyy = -3.7(2) MHz, Dzz = 10.5(2) MHz is well-described by a pseudostatic model with a temperature-dependent order parameter. In contrast, MuC60 shows a spherically isotropic diffusive or jump reorientation mechanism. C70 is frozen on a time scale of around 30 ns up to 170 K. On further heating, the motion is found to be complex, consisting of a uniaxial rotation part together with a nutational or jumping motion of the unique axis. Anisotropy on the 30 ns time scale persists up to 370 K, well into the face-centered cubic phase of solid C70. Above 390 K, the reorientational motion is essentially isotropic and the avoided level crossing resonance line disappears.

本文言語English
ページ(範囲)12133-12141
ページ数9
ジャーナルJournal of Physical Chemistry®
98
47
DOI
出版ステータスPublished - 1994 1 1
外部発表はい

ASJC Scopus subject areas

  • 工学(全般)
  • 物理化学および理論化学

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