Zeeman shift - A tool for assignment of super(14N NQR lines of nonequivalent ) super(1)4N atoms in powder samples

The use of Zeeman perturbed super(14N nuclear quadrupole resonance (NQR) to determine the [nu]) sub(+) and [nu] sub(- ) super(1)4N lines in polycrystalline samples with several nonequivalent nitrogen atoms was investigated. The super(14N NQR line shift due to a weak external Zeeman magnetic field wa...

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Bibliographic Details
Published in:Journal of magnetic resonance (1997) 2011-09, Vol.212 (1), p.149-153
Main Authors: Luznik, J, Jazbinsek, V, Pirnat, J, Seliger, J, Trontelj, Z
Format: Article
Language:English
Subjects:
Frequency shift
Magnetic fields
Mathematical analysis
Measurement methods
Nitrogen atoms
RDX
Singularities
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Summary:The use of Zeeman perturbed super(14N nuclear quadrupole resonance (NQR) to determine the [nu]) sub(+) and [nu] sub(- ) super(1)4N lines in polycrystalline samples with several nonequivalent nitrogen atoms was investigated. The super(14N NQR line shift due to a weak external Zeeman magnetic field was calculated, assuming isotropic distribution of EFG tensor directions. We calculated the broad line distribution of the [nu]) sub(+) and [nu] sub(- line shifts and experimentally confirmed the calculated Zeeman field dependence of singularities (NQR peaks) in cyclotrimethylenetrinitramine (RDX) and aminotetrazole monohydrate (ATMH). The calculated and measured frequency shifts agreed well. The proposed measurement method enabled determination of which ) super(1)4N NQR lines in ATMH belong to [nu] sub(+ and which to [nu]) sub(-) transitions.
ISSN:1090-7807
DOI:10.1016/j.jmr.2011.06.023