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Configuration dependence of photon stimulated ion desorption from methyl ester compounds induced by core excitation
Authors:Hiroyuki Kizaki
Affiliation:Department of Physical Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
Abstract:Photon stimulated ion desorption (PSID) from methyl ester terminated self-assembled monolayer (MHDA-SAM, HS(CH2)15COOCH3) and methyl mercaptoacetate (MA, HSCH2COOCH3) on Ag has been investigated using soft X-ray in the C and O K-edge regions. In MHDA-SAM on Ag, site-selective ion desorption has been clearly observed at resonant core excitations of C1s, O1s(OCH3) → σ(Osingle bondCH3) and O1s(OCH3) → σ(Csingle bondOCH3). Ion intensity in MA on Ag is obviously reduced for View the MathML source (n = 1-3) at C1s, O1s(OCH3) → σ(Osingle bondCH3) excitations, and no site-selective reaction at O1s(OCH3) → σ(Csingle bondOCH3) excitations has been observed. These reactions may be influenced by configurational difference of reactive sites. It is suggested that surface effects on the selective reaction due to positioning methyl ester group near the surface plays an important role.
Keywords:Near edge X-ray absorption fine structure (NEXAFS)   Core electron excitation   Photon stimulated desorption (PSD)   Self-assembled monolayer
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