a positively charged species clockwise may be superimposed over other waveforms 702 u2032 704 u2032 706 u2032 optimized to transport another positively charged species or a negatively charged species clockwise or counterclockwise to produce a third set of waveforms 702 u2033 704 u2033 706 u2033 that achieve transport of differing species in desired respective paths for example a heavy positive species may require a relatively high 50 duty cycle with a relatively long period to move along a chosen path a light negative species may require a relatively low duty cycle with a relatively short period to move along a chosen path the two waveforms may be superimposed to drive the positive and negative species in parallel clockwise or counter clockwise or anti parallel clockwise and counter clockwise to each other while the electrodes 106 108 110 are shown arranged in figures above such that a straight line connecting any two electrodes passes through the volume of an intervening flame other arrangements may be within the scope while the number of electrodes 106 108 110 shown in the embodiments above is three other numbers greater than three may similarly fall within the scope while the electrodes 106 108 110 are indicated as cylindrical conductors arranged parallel to the major axis of the burner nozzle other arrangements may fall within the scope for example in another embodiment a plurality of electrodes are arranged substantially at the corners of a cube.