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Reactive and Nonreactive Scattering of Modulated Molecular Beams from well Characterized Platinum Single Crystal Surfaces By Rebecca Johnson Gale NOTICE ABSTRACT Th* itpgfl mi pteptnd u u ucount of tpomortd by the United Slim Gurrmmeni. Ntlllmihc (tolled Sulci nor the United Stuet Dtputme; E«ily, roi V T of ihdr tmpto}ttt. not iny o! Oieti ojrlaoon, tubcnntncuit, or Ihtli tmptoym. mitn my •wnniy, ejpre» rtipofliihtlily for the accuracy, coniplelnKM « latlulncu of toy infomiiiion, ipparatui. product 01 pitteia dlidoMd, or [tpreienB (hit lu UK would noi l>u*rlate pilnitjy owned rtjhn. Reactive and nonreactive gas-surface interactions have been studied by modulated molecular beam mass spectro metry on Pt(lll) and stepped Pt(lll) surfaces under ultra high vacuum conditions. The three platinum single crystal surfaces used in this investigation, Pt(lll), Pt(S53) or Pt(S)-[5(lll)x(lll)], and Pt{332) or Pt(S)-[6(lll)x(lll)], were characterized as to structure by low energy electron diffraction (LEED) and as to composition by Auger electron spectroscopy (AES). The angular distribution of helium atoms scattered from the stepped Pt(553) surface was measured as a function of the angle of incidence (polar, 0, and azimuthal, . t ) Rainbow scattering was observed when the helium atoms were incident perpendicular to the step edges, with the open side of the step structure directed away from the incoming beam, indicating that the ordered array of steps and ter races exhibits a strongly periodic surface potential. a- i)i?ilitiiii/l lis*i *J* i'Ui$ i/UCt. >lh.M' I S UNL.LdJ.TEQ

osti oai (u.s. department of energy office of scientific and technical information)

Reactive and nonreactive scattering of modulated molecular beams from well characterized platinum single crystal surfaces. [Mechanism, rainbow scattering, angular distribution]