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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Ayoub, Yousif Asscher, Micha |
| Description | Country affiliation: Israel Author Affiliation: Ayoub Y ( Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, Israel.) |
| Abstract | Caging and photo-induced decomposition of ethyl chloride molecules (EC) within a layer of amorphous solid water (ASW) on top of clean and oxygen-covered Ru(001) under ultra-high vacuum (UHV) conditions are presented. The caged molecules were estimated to reside 1.5 ± 0.2 nm above the solid surface, based on parent molecule thermal decomposition on the clean ruthenium. Dissociative electron attachment (DEA) of the caged molecules following 193 nm laser irradiation, result in initial fragmentation to ethyl radical and chloride anion. It was found that photoreactivity on top of the clean ruthenium surface (Ru) is twenty times faster than on the oxygen-covered surface (O/Ru), with DEA cross sections: $σ_{Ru}$ = (3.8 ± 1) × $10^{−19}$ $cm^{2}$ and $σ_{O/Ru}$ = (2.1 ± 0.3) × $10^{−20}$ $cm^{2}.$ This difference is attributed to the higher work function of oxygen-covered ruthenium, leading to smaller electron attachment probability due to mismatch of the ruthenium photo-electron energy with the adsorbed EC excited electron affinity levels. EC molecules fragmented within the cage, result in post-irradiation TPD spectra that reveal primarily $C_{4}H_{8},$ $C_{3}H_{5}$ and $C_{3}H_{3},$ without any oxygen-containing molecules. Unique stabilization of the photoproducts has been observed with the first layer of water molecules in direct contact with the substrate, desorbing near 180 K, a significantly higher temperature than the desorption of fully caged molecules. This study may contribute for understanding stratospheric photochemistry and processes in interstellar space. |
| File Format | HTM / HTML |
| ISSN | 14639076 |
| Issue Number | 43 |
| Volume Number | 10 |
| e-ISSN | 14639084 |
| Journal | Physical Chemistry Chemical Physics |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Publisher Date | 2008-11-21 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | Subscribed |
| Subject Keyword | Discipline Physics Discipline Biophysics Discipline Chemistry Chemistry, Physical Methods Ethyl Chloride Chemistry Photochemistry Water Cations Electrons Hydrogen Hydrogen Bonding Molecular Structure Oxygen Ruthenium Surface Properties Temperature Journal Article Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physics and Astronomy Physical and Theoretical Chemistry |
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