Electron Spin Resonance Studies of Nitrogen Atoms Stabilized in Impurity-Helium Condensates
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© 2018, Springer Science+Business Media, LLC, part of Springer Nature. Impurity-helium condensates (IHCs) created by injection of nitrogen atoms and molecules as well as rare gas (RG) atoms (Ne, Ar, and Kr) into superfluid 4 He have been studied via electron spin resonance (ESR) techniques. We investigated the influence of addition of rare gas atoms (Ne, Ar, and Kr) into the condensing N 2 –He gas mixture on the efficiency of stabilization as well as on the local and average concentrations of N atoms attainable in IHCs. Addition of Ar and Kr atoms into the condensing N 2 –He gas mixture substantially increased the stabilization efficiency of N atoms in nanoclusters forming IHCs. Measurements of the ground-state spectroscopic parameters of nitrogen atoms show that the nanoclusters have a shell structure. Most of the N atoms reside on solid molecular layers of N 2 . These layers form on the surfaces of RG (Ar or Kr) nanoclusters.
author list (cited authors)
Meraki, A., McColgan, P. T., Boltnev, R. E., Lee, D. M., & Khmelenko, V. V.