High-resolution electric field and temperature distributions in positive streamers

In this work, we aim to take a detailed experimental picture of the positive streamer. We apply optical emission spectroscopy first negative system (FNS, B2Σu+→X2g+ ) id="m2">N2+ and second (SPS, C 3 Π u → B g N 2 . Large, centimeter wide, highly reproducible streamers are created in pure nitrogen synthetic air, at pressures ranging from 33 266 mbar. Direct time resolved spectral imaging space charge layer resulted spatiotemporal maps calculated reduced electric field strength ( E / rovibrational temperature sub-nanosecond sub-millimetre resolution. The peaks approximately 540 480 Td, directly front layer, for air respectively, as determined by using intensity ratio method FNS SPS. A global model PLASIMO uses experimentally distribution draw gas kinetics around passage. addition, results serve reference interpret rotational vibrational temperatures obtained SPS emissions.