01624nas a2200193   4500008004100000245010000041210006900141260001200210490000700222520098500229653002401214653000901238653001301247653003401260653002801294100001701322700001901339856007201358       2010                        eng d00aSupersonic metal plasma impact on a surface: an optical investigation of the pre-surface region0 aSupersonic metal plasma impact on a surface an optical investiga  c04/20100 v433 a<p>Aluminum plasma, produced in high vacuum by a pulsed, filtered cathodic arc plasma source, was directed onto a wall where if formed a coating. The accompanying "optical flare" known from the literature was visually observed, photographed, and spectroscopically investigated with appropriately high temporal (1 μs) and spatial (100 μm) resolution. Consistent with other observations using different techniques, it was found that the impact of the fully ionized plasma produces metal neutrals as well as desorbed gases, both of which interact with the incoming plasma. Most effectively are charge exchange collisions between doubly charged aluminum and neutral aluminum, which lead to a reduction of the flow of doubly charged before they reach the wall, and a reduction of neutrals as the move away from the surface. Those plasma-wall interactions are relevant for coating processes as well as for interpreting the plasma properties such as ion charge state distributions.</p>10acathodic arc plasma10aions10aneutrals10aoptical emission spectroscopy10aplasma-wall interaction1 aNi, Pavel, A1 aAnders, André  uhttps://facades.lbl.gov/publications/supersonic-metal-plasma-impact