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

Changho Choi, M. M. Pintar

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Tunneling spectra of strongly hindered CH3 in methylmalonic acid, dimethyl sulfide, propionic acid, and hexane are reported. The Zeeman-tunneling level-matching resonances are detected at ωZ=nωT, n=1/4, 1/3, 1/2, 2/3, 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 ωZ=2/3ωT and ωZ=2ωT, 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
Volume56
Issue number10
StatePublished - Sep 1 1997

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Electron energy levels
energy levels
Spectroscopy
spectroscopy
Methylmalonic Acid
dipoles
propionic acid
Propionic acid
Hexanes
Hexane
Ground state
Protons
sulfides
Magnetization
magnetization
acids
ground state
protons
Acids
symmetry

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Tunneling spectroscopy by matching energy levels in the spin-rotating frame. / Choi, Changho; Pintar, M. M.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 56, No. 10, 01.09.1997, p. 5954-5960.

Research output: Contribution to journalArticle

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