Electric field measurements in an atmospheric-pressure microplasma jet using Stark polarization emission spectroscopy of helium atomYan Lu, Shuqun Wu, Wenxin Cheng and Xinpei LuEur. Phys. J. Special Topics, 226 13 (2017) 2979-2989DOI: https://doi.org/10.1140/epjst/e2016-60334-7