Abstract
Electron spin relaxation times T1 and Tm of Tb3+ and Tm3+ in 1:1 water:ethanol and of Tb3+ doped (2%) in crystalline La2(oxalate)3 decahydrate were measured between about 4.2 and 10 K. Both cations are non-Kramers ions and have J = 6 ground states. Echo-detected spectra are compared with CW spectra and with field-stepped direct-detected EPR spectra. Due to the strong temperature dependence of T1, measurements were not made above 10 K. Between about 4.2 and 6 K T1 is strongly concentration dependent between 1 and ~ 50 mM. T1 values at 4.2 K are in the µs range which is orders of magnitude faster than for 3d transition metals. Phase memory times, Tm, are less than 500 ns, which is short relative to values observed for 3d transition metals and organic radicals at 4 K. Tm is longer in the oxalate lattice which is attributed to the lower proton concentration in oxalate than in the organic solvent, which decreases nuclear spin diffusion. The rigidity of the crystalline lattice also may contribute to longer Tm.
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Acknowledgements
This research was partially funded by NIH NCI R01 CA 177744. The closed cycle cooling system was developed by ColdEdge Technologies, Allentown PA, and installed with assistance by Dr. Arthur H. Heiss. Dr. Velavan Kathirvelu, National Institute of Technology Goa, assisted in providing the Tb3+ in La2(oxalate)3 crystals.
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McPeak, J., Alexander, D., Joseph, C. et al. Electron Spin Relaxation of Tb3+ and Tm3+ Ions. Appl Magn Reson 51, 961–976 (2020). https://doi.org/10.1007/s00723-020-01262-6
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DOI: https://doi.org/10.1007/s00723-020-01262-6