Muon-Nitrogen Quadrupolar Level Crossing Resonance in a Charge Transfer Salt.

ABSTRACT: Although muons are primarily regarded as a local spin probe, they can also access the charge state of an atom or molecule via quadrupolar level crossing resonance (QLCR) spectroscopy. We use Li⁺TCNQ^- (TCNQ = 7,7,8,8-tetracyanoquinodimethane), a simple charge transfer salt, to test the potential of this technique in molecular systems by studying the interaction of a positive muon with the TCNQ nitrogen atoms. We show that both a positive muon and muonium are able to add to the nitrogen, leading to a singlet spin state for the addition molecule. This produces a characteristic three line QLCR spectrum, with the observed line positions and intensities determined by the principal values and orientation of the electric field gradient tensor at the nitrogen. Ab initio calcul

SUBMITTER: Berlie A 

PROVIDER: S-EPMC9082611 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature