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The interactmn between gas-phase ortented NO molecules with Nl(100) has been mvesUgated by means of pulsed supersomc molecular beam, hexapole and time-of-flight techmques With TOF we examined the NO molecules leaving the clean N~(100) surface. A ,,eloclty dlstltbuhou t.ommen~utate wtth the surface temperature was obsc,ved The ttme-mtegrated s~gnal of the scattered NO beam shows an onentatmn asymmetry of As~ = 0 38 + 0 05 wtth respect to the NO and ON mltml orientation An lmtial sticking probabdity of 0 27 and 0 30 for preferential O-end and N-end colhsmns, respechvely, at a c(2 x 2) saturated layer of CO was also obtained. Taking the degree of orientation of the NO molecules into account, this leads to an asymmetry of Ast = 0 5 ___ 0 1 independent of coverage The CO molecules dtsplaced by NO were simultaneously recorded The CO signal shows an asymmetry with respect to the NO onentahon, as well. Two different d~splacement mechamsms are discussed to explain thts behavtor.

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