Abstract：
:An important step in oxide photochemistry, the loading of electrons into shallow trap states, was studied using infrared (IR) spectroscopy on both, rutile TiO2 powders and single-crystal, r-TiO2(110) oriented samples. After UV-irradiation or n-doping by exposure to H-atoms broad IR absorption lines are observed for the powders at around 940 cm(-1). For the single crystal substrates, the IR absorption bands arising from an excitation of the trapped electrons into higher-lying final states show additional features not observed in previous work. On the basis of our new, high-resolution data and theoretical studies on the polaron binding energy in rutile we propose that the trap states correspond to polarons and are thus intrinsic in nature. We assign the final states probed by the IR-experiments to hydrogenic states within the polaron potential. Implications of these observations for photochemistry on oxides will be briefly discussed.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Sezen H,Buchholz M,Nefedov A,Natzeck C,Heissler S,Di Valentin C,Wöll Cdoi
10.1038/srep03808subject
Has Abstractpub_date
2014-01-22 00:00:00pages
3808issn
2045-2322pii
srep03808journal_volume
4pub_type
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