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• W1973176211 abstract "The adsorption of NO2 on the rutile TiO2(110) surface has been studied at room temperature in the pressure range from ∼10−8 torr to 200 mtorr using ambient pressure X-ray photoelectron spectroscopy (AP-XPS). Atomic nitrogen, chemisorbed NO2, and NO3 were formed, each of which saturates at pressures below ∼10−6 torr NO2. Atomic nitrogen originates from decomposition of the NOx species. For pressures of up to 10−3 torr, no significant change in the NOx surface species occurred, suggesting that environmentally relevant conditions with typical NO2 partial pressures in the 1−100 ppb range can be modeled by ultrahigh vacuum (UHV) studies. The chemisorbed surface species can be removed by in situ annealing in UHV: all of the NOx species disappear around 400 K, whereas the N 1s signal associated with atomic nitrogen diminishes around 580 K. At higher pressures of NO2 (p(NO2) ≥ 10−6 torr), physisorbed NO2 and adsorbed water, which was likely due to displacement from the chamber walls, appeared. The water coverage grew significantly above ∼10−3 torr. Concurrently with co-condensation of water and NO2, the population of NO3 species grew strongly. From this, we conclude that the presence of NO2 and water leads to the formation of multilayers of nitric acid. In contrast, pure water exposure after saturation of the surface with 200 mtorr NO2 did not lead to a growth of the NO3 signals, implying that HNO3 formation requires weakly adsorbed NO2 species. These findings have important implications for environmental processes, since they confirm that oxides may facilitate nitric acid formation under ambient humidity conditions encountered in the atmosphere." @default.
• W1973176211 created "2016-06-24" @default.
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• W1973176211 date "2010-01-13" @default.
• W1973176211 modified "2023-09-27" @default.
• W1973176211 title "<i>In Situ</i> Ambient Pressure Studies of the Chemistry of NO₂ and Water on Rutile TiO₂(110)" @default.
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• W1973176211 doi "https://doi.org/10.1021/la904141k" @default.
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