Abstract
Thermal desorption (TD) and photo-stimulated desorption (PSD) studies of 18O 2 pre-adsorbed TiO 2 powders have been carried out under high-temperature UHV treatment. At peak temperatures ( T p) 180 and 470 K with a shoulder at about 520 K, 18O 2 TD's are observed. TD of 16O 18O with a small amount of 16O 2 is observed at 530 K, indicating that oxygen isotope exchange occurs between 18O 2 gas and defective TiO 2 surfaces. By UV illumination with the threshold energy of 3.0 eV, 18O 2 PSD takes place at room temperature, which results in the decrease of an 18O 2 TD peak. PSD rate decays as t − n with n about 0.5, where t is the il time. A plausible PSD mechanism is discussed based on the substrate-dependent process induced by photons with band-gap energy.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: 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.
