Study of the NH4 tunneling manifold by energy level matching in the proton spin rotating frame

C. Choi, A. Damyanovich, J. Peternel, M. M. Pintar

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Matching of Zeeman and tunneling levels in the proton spin rotating frame is used to detect splitting of the torsional ground state due to rotational tunneling of the NH4 group in solid NH4I. When highly polarized Zeeman splitting matches tunneling splitting a fast resonant transfer of polarization between Zeeman and tunneling states occurs. This in turn causes a change of the proton magnetization. When the magnetization change is monitored as a function of the magnetic field strength in the rotating frame, peaks are observed whenever two levels match. The model spectrum of the NH4 group with a split F-symmetry state, indicating that the symmetry of the lattice potential at the site of the NH4 group is lower than tetrahedral, reproduces the observed spectrum. The energy differences between the A state and the nondegenerate, lower F state and between this F state and the degenerate, higher F state, as measured by level matching in units kHz, are 82±4 and 41±2, respectively. The magnetization evolution spectrum shows peaks at 78±3 and 116±4 kHz which equal the anticipated A to lower F and the lower F to higher F energy differences.

Original languageEnglish (US)
Pages (from-to)3962-3965
Number of pages4
JournalJournal of Chemical Physics
Volume108
Issue number10
StatePublished - Mar 8 1998

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Electron energy levels
Protons
Magnetization
energy levels
protons
magnetization
Ground state
symmetry
Polarization
Magnetic fields
field strength
ground state
energy
causes
polarization
magnetic fields

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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Study of the NH4 tunneling manifold by energy level matching in the proton spin rotating frame. / Choi, C.; Damyanovich, A.; Peternel, J.; Pintar, M. M.

In: Journal of Chemical Physics, Vol. 108, No. 10, 08.03.1998, p. 3962-3965.

Research output: Contribution to journalArticle

Choi, C, Damyanovich, A, Peternel, J & Pintar, MM 1998, 'Study of the NH4 tunneling manifold by energy level matching in the proton spin rotating frame', Journal of Chemical Physics, vol. 108, no. 10, pp. 3962-3965.
Choi, C. ; Damyanovich, A. ; Peternel, J. ; Pintar, M. M. / Study of the NH4 tunneling manifold by energy level matching in the proton spin rotating frame. In: Journal of Chemical Physics. 1998 ; Vol. 108, No. 10. pp. 3962-3965.
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