UV photoreaction cross sections of CO and D2O on NiAl(110)

Adsorption states and photoreactions of CO and D2O adsorbed on NiAl(110) at 90K were studied by temperature-programmed desorption (TPD). Coverage dependence of TPD spectra showed growth behavior of adlayers of these molecules consistent with the literature, but a new path of thermal dissociation of...

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Bibliographic Details
Published in:Surface science 2016-01, Vol.643, p.30-35
Main Authors: Nagai, Kenta, Watanabe, Kazuo
Format: Article
Language:English
Subjects:
Carbon monoxide
D2O
Heavy water
NiAl
Surface photochemistry
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Summary:Adsorption states and photoreactions of CO and D2O adsorbed on NiAl(110) at 90K were studied by temperature-programmed desorption (TPD). Coverage dependence of TPD spectra showed growth behavior of adlayers of these molecules consistent with the literature, but a new path of thermal dissociation of D2O upon adsorption at 90K was found. The photoreaction cross sections of CO and D2O at 4.7eV were estimated in the order of 10−21 cm2 and 10−20 cm2, respectively. This result suggests that photoexcitation of the NiAl(110) substrate itself, a typical substrate used in supported model catalyst studies, will induce only negligible photoreactions of molecules adsorbed at surfaces of metal nanoparticles supported on ultrathin alumina films formed on NiAl(110). [Display omitted] •Adsorption states and photoreactions of CO and D2O on NiAl(110) were studied by TPD.•Photoreaction cross sections of these molecules on NiAl(110) were negligibly small.•A new path of thermal dissociation of D2O upon adsorption at 90K was found.
ISSN:0039-6028
1879-2758
DOI:10.1016/j.susc.2015.08.041