Tunneling spectroscopy by matching energy levels in the spin-rotating frame

Changho Choi, M. M. Pintar

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Tunneling spectra of strongly hindered (Formula presented) in methylmalonic acid, dimethyl sulfide, propionic acid, and hexane are reported. The Zeeman-tunneling level-matching resonances are detected at (Formula presented) 1, and 2 when the level matching is maintained for 10 ms in the 54.7° tilted proton spin-rotating frame. A ground-state manifold of two noninteracting but equivalent methyl groups accounts for these spectra. All the transitions, which bring about the population equalization whenever a matching resonance occurs, are driven by time-independent dipole-dipole interactions. The resonance peaks at (Formula presented) and (Formula presented) which are observed in a tilted rotating frame only, indicate that pairs of methyl groups undergo a symmetry conversion simultaneously. The calculated magnetization changes, which are the consequence of population equilibration, reproduce the observed resonance peaks intensities well.

Original languageEnglish (US)
Pages (from-to)5954-5960
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number10
StatePublished - Jan 1 1997

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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