An investigation of sparks produced in a number of gases by means of a transversely excited atmospheric-pressure (TEA) CO2 laser has revealed the existence of a clearly visible plasma filament which propagates at an almost constant velocity in the same direction as the laser beam.
No takes yet. Share an insight, caveat, or question.
Gravel et al. (1971) studied this question.
Synapse has enriched one closely related paper. Consider it for comparative context: