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- W2325451843 abstract "The enthalpies of molecular and dissociative adsorption of CH2I2 on Pt(111) at 100–210 K were studied using single-crystal adsorption calorimetry and density functional theory (DFT). Gaseous CH2I2 was found to adsorb on the Pt(111) surface at 100 K to form CH2,ad + 2Iad, with a calorimetric heat of adsorption that decreases with coverage as 222–480θ kJ/mol for θ < 1/8, where θ is the coverage in monolayers (ML), defined as the number of dissociatively adsorbed CH2I2 molecules per Pt(111) surface atom. These coadsorbed iodine atoms greatly destabilize the methylene species even at the lowest coverage, which we attribute to their inability to diffuse away from the near-neighbor sites where they are initially produced on the short time scale of the heat measurement. A mixture of dissociative adsorption fragments of methylene and methylidyne were detected at elevated temperatures between 125 and 190 K. At 210 K, CH2I2 adsorption produced CHad, Had, and 2Iad, with the Iad now able to diffuse away to minimize r..." @default.
- W2325451843 created "2016-06-24" @default.
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- W2325451843 date "2014-08-21" @default.
- W2325451843 modified "2023-10-16" @default.
- W2325451843 title "Energetics of Adsorbed CH<sub>2</sub> and CH on Pt(111) by Calorimetry: The Dissociative Adsorption of Diiodomethane" @default.
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- W2325451843 doi "https://doi.org/10.1021/jp505494a" @default.
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