This movie shows how an atmospheric plasma torch can be ignited by microwaves with no additional igniters and provides a stable and continuous plasma operation suitable for plenty of applications.
Leins, M., Gaiser, S., Schulz, A., Walker, M., Schumacher, U., Hirth, T. How to Ignite an Atmospheric Pressure Microwave Plasma Torch without Any Additional Igniters. J. Vis. Exp. (98), e52816, doi:10.3791/52816 (2015).