The rotational temperatures of arcs propagating over an ice surface, under DC-positive, DC-negative and AC applied voltages, have been measured and compared. The spectra of the emitted light during the arc propagation were collected and analyzed using a spectroscopic system. A strong diatomic molecular band of OH was observed from the captured spectra with two distinct peaks at about 307 nm and 309 nm.
- ice surface
- arc propagation