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Study of resonant Auger emission in Pt3Co alloy with resonant photoemission
서민식,강하빈,김건화,정문정,Bournel Fabrice,Gallet Jean-Jacques,김기정,문봉진 한국물리학회 2021 Current Applied Physics Vol.30 No.-
Valence band spectra of a polycrystalline Pt3Co alloy were measured with photon energies near Co L3 absorption edge. On the absorption edge, Co L3M4, 5M4, 5 Auger signals are superimposed on the valence band spectra. Prior to the absorption maximum, the Auger signals display constant binding energy corresponding to radiationless Raman Auger process. After the absorption maximum, normal Auger process occurs, showing characteristics of constant kinetic energy. The transition of Auger process in Pt3Co is carefully discussed, which is deviating to that in Co metal and other 3d transition metals. Our analysis of resonant Auger spectra confirmed the strong delocalization of Co 3d band in Pt3Co alloy.
Yu, Youngseok,Koh, Yoobin Esther,Lim, Hojoon,Jeong, Beomgyun,Isegawa, Kazuhisa,Kim, Daehyun,Ueda, Kohei,Kondoh, Hiroshi,Mase, Kazuhiko,Crumlin, Ethan J,Ross Jr, Philip N,Gallet, Jean-Jacques,Bournel, Institute of Physics 2017 Journal of Physics, Condensed Matter Vol.29 No.46
<P>The study of CO oxidation on Pt(1 1 0) surface is revisited using ambient pressure x-ray photoemission spectroscopy. When the surface temperature reaches the activation temperature for CO oxidation under elevated pressure conditions, both the <I>α</I>-phase of PtO<SUB>2</SUB> oxide and chemisorbed oxygen are formed simultaneously on the surface. Due to the exothermic nature of CO oxidation, the temperature of the Pt surface increases as CO oxidation takes place. As the CO/O<SUB>2</SUB> ratio increases, the production of CO<SUB>2</SUB> increases continuously and the surface temperature also increases. Interestingly, within the diffusion limited regions, the amount of surface oxide changes little while the chemisorbed oxygen is reduced.</P>