Abstract
Ion photodesorption processes from carbon monoxide condensed in multilayers have been studied for photon energies between 12 and 60 eV. In the low energy range (12–25 eV), only the CO+ ion desorbs and the desorption is induced by the formation of excited neutral states. In the high energy range (25–60 eV), a large variety of ions desorb: C+, O+, CO+, C2O+, (CO)2+, C3O2+, and C3O+. The desorption threshold for these ions is around 30 eV and is assigned to the formation of satellite states. The ion desorption is related to fragmentation processes and ion-molecule reactions on the surface. Comparison with gas phase results show that the dissociative ionization of CO can be modified in the condensed phase by charge-transfer processes. Kinetic energy measurements of the desorbed ions support the proposed mechanisms.
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