Ding, ZhiyueQiao, KeErnst, N.Kong, JieChen, M.Matthews, L.S.Hyde, T. W.2020-08-032020-08-032009-10New Journal of Physics, 21, 103051, October, 2019https://hdl.handle.net/2104/10965In this paper, we report the first experimental observation of internal resonance in a dusty plasma, which shows the intrinsic nonlinearities of dust interactions in plasmas. When driving a system of vertically aligned dust particle pairs in the vertical direction, the horizontal motion is found to be excited during onset of internal resonance when the higher-frequency horizontal sloshing mode is nonlinearly coupled to the vertical breathing mode through the 1:2 commensurable relation. A theoretical model of the nonlinear interaction of dust particles in plasma is also provided and the results of the theoretical model are shown to match experimental observations.enArticlee observed in a dusty plasma, New Journal of Physics, 21, 103051, October, 2019. DOI: 10.1088/1367-2630/ab4d95