Corona discharge the electron-liberation is a high-energy photon from an atom within the plasma body relaxing after excitation from an earlier collision. The use of ionized neutral gas as a source of ionization is further diminished in a negative corona by the high-concentration of positive ions clustering around the curved electrode. Under other conditions, the collision of the positive species with the curved electrode can also cause electron liberation. The difference, then, between positive and negative coronas, in the matter of the generation of secondary electron avalanches, is that in a positive corona they are generated by the gas surrounding the plasma
Negative and positive rights very serious ethical questions need come into play before stealing could justify killing. Positive obligations confer duty. But as we see with the police officer, exercising a duty may violate negative obligations (e.g. not to overreact and kill). For this reason, in ethics positive obligations are almost never considered "prima facie". The greatest negative obligation may have just one exception—one higher obligation of self-defense—but even the greatest positive obligations generally require more complex ethical analysis. For example, one could easily justify failing to help, not just one, but a great many injured children quite ethically in the case of triage