Abstract
Using the continuous NQR method with synchronous detection in the sweep mode, in melt-grown layered InSe single crystals, the 115In NQR spectra were studied for four <sup>115</sup>In resonance transitions with spin 9/2, the average values of which only approximately satisfied the ratio v<sub>1</sub>:v<sub>2</sub>:v<sub>3</sub>:v<sub>4</sub> = 1: 2: 3: 4. It is established that for higher-order transitions there is a deviation of the frequency multiplicity. In particular, it is shown that additional lines are observed in multiplet groups for higher-order transitions, which, in our opinion, is due to the presence of hexadecapole interaction of <sup>115</sup>In nuclei with the electric field gradient in InSe.
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