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We have studied a mosaic of 1T-CrSe$_2$ single crystals using$\beta$-detected nuclear magnetic resonance of $^{8}$Li from 4 to 300 K. Weidentify two broad resonances that show no evidence of quadrupolar splitting,indicating two magnetically distinct environments for the implanted ion. Weobserve stretched exponential spin lattice relaxation and a corresponding rate($1/T_1$) that increases monotonically above 200 K, consistent with the onsetof ionic diffusion. A pronounced maximum in $1/T_1$ is observed at the lowtemperature magnetic transition near 20 K. Between these limits, $1/T_1$instead exhibits a broad minimum with a remarkable absence of strong featuresin the vicinity of structural and magnetic transitions between 150 and 200 K.Together, the results suggest $^{8}$Li$^{+}$ site occupation within the van derWaals gap between CrSe$_2$ trilayers. Possible origins of the two environmentsare discussed.

Investigation of Ionic and Anomalous Magnetic Behavior in CrSe$_2$ Using $^8$Li $\beta$-NMR