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Berger, B,You, K,Lee, H-C,Mussenbrock, T,Awakowicz, P,Schulze, J IOP PUBLISHING 2018 PLASMA SOURCES SCIENCE AND TECHNOLOGY Vol.27 No.12
<P>The fundamental investigation of different electron heating modes is important in order to fully understand the generation of plasmas, as well as to optimize their technological applications. In this study, a capacitively coupled radio-frequency discharge is operated at its limit of comparably low plasma density. Phase resolved optical emission spectroscopy provides insights into the electron dynamics on a nanosecond time scale under these conditions. At low applied voltage amplitudes, it is observed that more than one electron beam is generated within a single phase of sheath expansion at a given electrode. When the voltage amplitude is increased these beams merge in time to a single electron beam. This effect has been predicted by particle in cell/Monte-Carlo collision simulations before and contradicts existing models that assume the generation of a single beam per sheath expansion phase by stochastic heating (Wilczek <I>et al</I> 2015 <I>Plasma Sources Sci. Technol.</I> <B>24</B> 024002; Wilczek <I>et al</I> 2016 <I>Phys. Plasmas</I> <B>23</B> 063514). In this study, results from a systematic experimental study of the effect are presented, which support the theoretically predicted phenomenon.</P>