Abstract
Abstract A photon-stimulated desorption (PSD) process consists of the production of ions and neutrals upon irradiation with light of proper wavelength. Here, we present a short review on the PSD mechanisms and the parameters influencing it, such as the adsorbate–substrate coupling, the light polarization, the surface orientation, the temperature, the mass of the leaving fragments as well as the co-adsorption effects. Furthermore, as an example, we will present a PSD investigation of formic acid on Si(1 1 1)7×7 in the energy ranges including the C 1s and the O 1s thresholds. D + , C + , CD + , O + , CO + , DCO + ions are produced in both energy ranges. The excitation in the C 1s energy range offers a less efficient substrate-mediated quenching with respect to the excitation in the O 1s one, with a consequent more structured photoexcitation spectrum. In the energy range including the O 1s the transitions to π * (CO) and σ * (C–D) levels produce selectively either D + or CDO + . O + is produced both by a transition to a π * (CO) level on through a shake-off process, and the remaining fragments are generally produced through secondary electrons.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.