A method for removing species from a substrate includes arranging a purge ring in a chamber proximate to a pedestal. The purge ring includes an inlet portion and an exhaust portion. The inlet portion defines an inlet plenum and an inlet baffle. The inlet baffle includes a continuous slit that is substantially continuous around a peripheral arc not less than about 270°. The exhaust portion includes an exhaust channel that is located substantially opposite the inlet baffle. The method further includes supplying ozone to the inlet plenum; at least partially defining a ring hole space having a periphery using the inlet portion and the exhaust portion; conveying gas from the inlet plenum into the ring hole space using the inlet baffle; conveying gas and other matter out of a purge space using the exhaust portion; and inhibiting deposition of material evolved from the substrate during curing using the purge ring.