Abstract
Active control of site-specific photon stimulated ion desorption (PSID) following core excitation was examined by changing the molecular environment and the direction of the electric field vector of the incidence light in the three different molecular systems, poly-methylmethacrylate (PMMA) thin film, methyl ester terminated self-assembled monolayer (MHDA-SAM), and condensed methyl isobutyrate (MIB) molecule. In PMMA and MHDA-SAM, the site-selective resonant excitation causes site-specific PSID, and the site specificity of MHDA-SAM is more enhanced than that of PMMA, while there is no specific desorption in MIB. These variations were explained with the change of molecular environment. Moreover, PSID of CH n + ( n=1–3) ions observed at the σ *(O–CH 3)←C1s(OCH 3) excitation of MHDA-SAM exhibits significant dependence on the incidence angle of the light.
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