Non-thermal Surface Chemistry of Halogenated Molecules: Giant Electron-induced Enhancements of Negative Ion Desorption

卤化分子的非热表面化学：巨电子诱导的负离子解吸增强

• 批准号: 0075995
• 负责人: Theodore Madey
• 金额: $ 32.4万
• 依托单位: Rutgers University New Brunswick
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-08-01 至 2004-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0075995&HistoricalAwards=false
• 关键词: Non; thermal; Surface; Chemistry; Halogenated

Investigation of the mechanism of fluorine and chlorine anion emission from adsorbed layers of halogenated hydrocarbons irradiated by electrons forms the focus of this research project supported by the Analytical and Surface Chemistry Program. Professor Theodore Madey and his coworkers at Rutgers University are examining the enhanced emission of Cl- and F- from physisorbed layers of CFC's in contact with water, ammonia, or non-polar co-adsorbates. A series of measurements is being carried out to elucidate the mechanism of this enhanced emission, and the connection this may have to the heterogeneous chemistry of ozone in the stratosphere. Electron stimulated ion angular and energy distributions are measured under a variety of conditions of surface temperature, co-adsorbate polarity, and incident electron energy in order to provide mechanistic understanding of the fundamental surface processes of ion emission.When adsorbed layers of chlorofluorocarbon compounds are irradiated with low energy electrons, significant amounts of chlorine and fluorine anions are desorbed. In the presence of certain polar co-adsorbates such as water and ammonia, this emission is dramatically enhanced. This research project examines this effect with a series of ion angular and energy distribution measurements. Connections of this effect with problems of ozone depletion in heterogeneous stratospheric chemistry are made in this research. The results of these studies, in addition to providing considerable fundamental insight into ion processes at surfaces, may help to understand stratospheric ozone depletion processes

调查氟和氯阴离子发射的机制，从吸附层的卤代烃辐射电子形式的重点，由分析和表面化学计划支持的本研究项目。 罗格斯大学的西奥多·马迪教授和他的同事正在研究与水、氨或非极性共吸附物接触的CFC物理吸附层中Cl-和F-的增强排放。 目前正在进行一系列的测量，以阐明这种排放增强的机制，以及这可能与平流层臭氧的非均匀化学性质之间的联系。 电子激发离子的角和能量分布测量各种条件下的表面温度，共吸附的极性，和入射电子能量，以提供离子emission.When吸附层的氯氟烃化合物的基本表面过程的机械理解用低能电子辐照，显着量的氯和氟阴离子解吸。 在某些极性共吸附物如水和氨的存在下，这种排放显著增强。 本研究项目通过一系列离子角分布和能量分布测量来研究这种效应。 在这项研究中，这种影响与非均质平流层化学中臭氧消耗问题的联系。 这些研究的结果，除了提供了相当多的基本了解离子过程在地面上，可能有助于了解平流层臭氧消耗过程