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Probe of I(Pj) atoms using two-photon resonant four-wave mixing spectroscopy following the 266-nm photodissociations of various alkyl and perfluoroalkyl iodides |
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| Authors: | Kyoung-Seok Lee Sang Kuk Lee Tae Kyu Kim |
| Affiliation: | a Division of Metrology for Quality Life, Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea b Information and Electronic Materials Research Institute, LG Chem/Research Park, Daejeon 305-380, Republic of Korea c Department of Chemistry, Pusan National University, Pusan 609-735, Republic of Korea d Department of Chemistry and School of Molecular Science, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea |
| Abstract: | Two-photon resonant four-wave mixing spectroscopy has been utilized successfully for probing I and I∗ nascent from the 266 nm photodissociations of various alkyl and perfluoroalkyl iodides. The relative quantum yields for I∗, as well as the recoil anisotropy parameters, were extracted. Recoil anisotropy parameters close to the limit value for parallel transition indicates that the ground-state I(2P3/2) originates from the curve crossing from the initially prepared 3Q0 to 1Q1 state. The curve-crossing probabilities for alkyl and perfluoroalkyl iodides were obtained and tried to explain using the well-known Landau-Zener model. In the cases of perfluoroalkyl iodides, it is necessary to consider the fluorination effect to describe the detailed dynamics observed in this study and has been revealed that the electronic effect due to fluorine atom substitution is dominant, leading to decrease in the curve-crossing probability. |
| Keywords: | Two-photon resonant four-wave mixing spectroscopy Alkyl halides Photodissociation |
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