Abstract
The formation of paramagnetic Mo5+ centers in strongly disordered nanodimensional MoO3 films as a result of the photoinjection of hydrogen at room and helium temperatures has been studied. The room-temperature concentration of paramagnetic Mo5+ centers quite rapidly reaches saturation, whereas at helium temperatures, it exhibits continuous growth during the entire hydrogen photoinjection process. Free radicals have been found at helium temperatures, which appear as a result of hydrogen atom detachment from adsorbed molecules (acting as hydrogen donors). The rate of radical formation decreases approximately by half during irradiation, while the rate of formation of the Mo5+ centers in the irradiated films exhibits a more than tenfold drop. This difference is related to the formation of [Mo5+ Mo5+] pair centers.
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