High-resolution discrete absorption spectrum of α-methallyl free radical in the vapor phase
| Autor: | Fikret Ari, İpek Ş. Karaaslan, Lale Tunçyürek, Fuat Bayrakçeken, Ali Yaman, Ziya Telatar |
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| Rok vydání: | 2006 |
| Předmět: |
Free Radicals
Spectrophotometry Infrared Absorption spectroscopy Chemistry Spectrophotometry Atomic Radical Kinetics Photodissociation Analytical chemistry Atomic and Molecular Physics and Optics Analytical Chemistry Allyl Compounds Reaction rate constant Spectrophotometry Extinction (optical mineralogy) Image Processing Computer-Assisted Flash photolysis Gases Volatilization Absorption (electromagnetic radiation) Instrumentation Spectroscopy |
| Zdroj: | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 65:143-146 |
| ISSN: | 1386-1425 |
| DOI: | 10.1016/j.saa.2005.09.038 |
| Popis: | The alpha-methallyl free radical is formed in the flash photolysis of 3-methylbut-1-ene, and cis-pent-2-ene in the vapor phase, and then subsequent reactions have been investigated by kinetic spectroscopy and gas-liquid chromatography. The photolysis flash was of short duration and it was possible to follow the kinetics of the radicals' decay, which occurred predominantly by bimolecular recombination. The measured rate constant for the alpha-methallyl recombination was (3.5+/-0.3) x 10(10) mol(-1) ls(-1) at 295+/-2K. The absolute extinction coefficients of the alpha-methallyl radical are calculated from the optical densities of the absorption bands. Detailed analysis of related absorption bands and lifetime measurements in the original alpha-methallyl high-resolution discrete absorption spectrum image were also carried out by image processing techniques. |
| Databáze: | OpenAIRE |
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