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| Content Provider | Royal Society of Chemistry (RSC) |
|---|---|
| Author | Seakins, Paul W. Romero, Maria Teresa Baeza Cleary, Patricia A. Heard, Dwayne E. Wang, Liming Blitz, Mark A. Pilling, Michael J. |
| Copyright Year | 2006 |
| Abstract | The pressure and temperature dependence for the reaction of OH + C2H4 was studied over the range of conditions: 200–400 K and 5–600 Torr by laser flash photolysis, laser-induced fluorescence (FP-LIF). Additional experiments were conducted at room temperature by laser flash photolysis, cavity ring-down spectroscopy to facilitate determination of the high pressure limit. One-dimensional master equation calculations were conducted to test the temperature and pressure dependence of the reaction in He and in N2. The energetics of the reaction and geometries of intermediate species were calculated by ab initio calculations (DFT-BH&HLYP/6-311+G(3df,2p) and CBS-APNO level along DFT-IRC, respectively. An investigation into the importance of a pre-reaction van der Waals complex on the kinetics over the pressure range of the troposphere is discussed. The high pressure rate coefficient was extracted by fitting the master equation calculations to the data and yields k∞ = 5.01 × 10−12 exp(148/T) cm3 molecule−1 s−1. The master equation calculations were then optimized for the pressure fall-off in He and N2 by varying the average downward energy transfer parameter (〈ΔE〉down) for the different collision partners and finally fitted to a Troe expression to determine ko and Fcent for use in atmospheric modeling. |
| Starting Page | 5633 |
| Ending Page | 5642 |
| Page Count | 10 |
| File Format | HTM / HTML PDF |
| ISSN | 14639076 |
| Volume Number | 8 |
| Issue Number | 48 |
| Journal | Physical Chemistry Chemical Physics |
| DOI | 10.1039/b612127f |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Access Restriction | Open |
| Subject Keyword | Energetics Laser-induced fluorescence Master equation Laser Troposphere Flash photolysis Trøe Cavity ring-down spectroscopy Van der Waals force Ab initio quantum chemistry methods |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physics and Astronomy Physical and Theoretical Chemistry |
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