Spectroscopic characterization of surface species derived from HCOOH, CH3COOH, CH3OH, C2H5OH, HCOOCH3, and C2H2 on MgO thin film surfaces

Abstract Neutralization of surface charge and determination of an appropriate binding energy reference are among the difficulties in characterizing adsorbates on insulator surfaces with electron spectroscopies. In the present study, the surface charging problem associated with insulating MgO was circumvented by using MgO thin films formed on the Mg(0001) surface by O 2 adsorption. XPS and UPS spectra were obtained from HCOOH, CH 3 COOH, CH 3 OH, C 2 H 5 OH, HCOOCH 3 , and C 2 H 2 adsorbed on the MgO thin film at temperatures ranging from 170 to 550 K. The adsorption states of these molecules at different temperatures were essentially consistent with those reported on MgO powders and characterized by other techniques, indicating that MgO thin films provide good models of bulk MgO, with distinct advantages for electron spectroscopic studies.

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