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

Autor:	M. M. Pintar, Changho Choi, J. Peternel, A. Damyanovich
Rok vydání:	1998
Předmět:	Zeeman effect Chemistry Degenerate energy levels General Physics and Astronomy Magnetic field symbols.namesake Magnetization Proton spin crisis Model spectrum symbols Physical and Theoretical Chemistry Atomic physics Ground state Quantum tunnelling
Zdroj:	The Journal of Chemical Physics. 108:3962-3965
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.475798
Popis:	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 spec...
Databáze:	OpenAIRE
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