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• W2020590929 abstract "CF 3 I adsorption on a silicon surface and the effect of low-energy electron bombardment of a CF3I-covered silicon surface are relevant to plasma etching. Dissociative chemisorption of CF3I on Si(100) surface is observed at 370 K. Uptake measurements corroborated by work-function change measurements and temperature-programmed desorption (TPD) gives a sticking probability of at least 0.34±0.05. Molecular orbital calculations yield an adsorption energy greater than 3 eV for dissociative chemisorption of CF3X (X=F, Cl, Br, and I) on Si(100) (modeled by Si9H12) with X transferred to a silicon atom. We conclude that the variation in the sticking probability across the CF3X family is a consequence of the activation energy barrier for C–X bond cleavage. In TPD, SiF4 desorbs at 370 and 840 K, SiF3 radical at 770 K, and atomic iodine at 790 K. The parent CF3I does not desorb. Electron-stimulated desorption (ESD) yields F+, F− and a trace of I+. The threshold for the appearance of F+ is 20 eV and for F− is 29 eV. Dissociative ionization and dipolar dissociation are possible mechanisms for ESD of F+. Dipolar dissociation and harpooning are possible mechanisms for ESD of F−. There is evidence that iodine on the surface quenches the electronically excited states that lead to desorption of F−." @default.
• W2020590929 created "2016-06-24" @default.
• W2020590929 creator A5022391836 @default.
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• W2020590929 date "2002-05-30" @default.
• W2020590929 modified "2023-09-26" @default.
• W2020590929 title "CF3I on a silicon surface: Adsorption, temperature-programmed desorption, and electron-stimulated desorption" @default.
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• W2020590929 doi "https://doi.org/10.1063/1.1477190" @default.
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