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Results of scattering of 80-300 eV O 2 and NO from Ag( 111) and PtC 111) single crystal surfaces are presented. Molecular negative ion formation occurs on both surfaces. For O 2 scattering around 80 e V for 0; =.70° from Ag C 111 ), the 0; distribution is detected in the ~pecular direction, whereas an off-specular shift towards the surface is observed for scattering trom PtC 111). For the PtC 111) surface, a degree of dissociation is observed that is much larger than for the Ag( 111) surface. Both observations are consistent with the low dissociative sticking probability for thermal O 2 on AgC 111) reported and the high dissociative sticking probability for thermal O 2 on PtC 111). For NO -, the degree of dissociation is approximately equal to the degree of dissociation for O 2 at the same PtC 111) surface.

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