| Alternative title | Excited state dynamics of CH2I2 and CH2BrI studied with UV pump VUV probe photoelectron spectroscopy |
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| DOI | Resolve DOI: https://doi.org/10.1063/1.5086665 |
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| Author | Search for: Horton, Spencer L.ORCID identifier: https://orcid.org/0000-0002-4380-4485; Search for: Liu, Yusong; Search for: Forbes, Ruaridh; Search for: Makhija, Varun; Search for: Lausten, Rune1; Search for: Stolow, Albert1; Search for: Hockett, Paul1; Search for: Marquetand, PhilippORCID identifier: https://orcid.org/0000-0002-8711-1533; Search for: Rozgonyi, Tamás; Search for: Weinacht, ThomasORCID identifier: https://orcid.org/0000-0001-9343-7276 |
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| Affiliation | - National Research Council of Canada. Security and Disruptive Technologies
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| Format | Text, Article |
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| Abstract | We compare the excited state dynamics of diiodomethane (CH₂I₂) and bromoiodomethane (CH₂BrI) using time resolved photoelectron spectroscopy. A 4.65 eV UV pump pulse launches a dissociative wave packet on excited states of both molecules and the ensuing dynamics are probed via photoionization using a 7.75 eV probe pulse. The resulting photoelectrons are measured with the velocity map imaging technique for each pump-probe delay. Our measurements highlight differences in the dynamics for the two molecules, which are interpreted with high-level ab initio molecular dynamics (trajectory surface hopping) calculations. Our analysis allows us to associate features in the photoelectron spectrum with different portions of the excited state wave packet represented by different trajectories. The excited state dynamics in bromoiodomethane are simple and can be described in terms of direct dissociation along the C–I coordinate, whereas the dynamics in diiodomethane involve internal conversion and motion along multiple dimensions. |
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| Publication date | 2019-05-07 |
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| Publisher | American Institute of Physics |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | f05fc3a3-a12a-44d8-8c57-be953b151e47 |
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| Record created | 2021-03-04 |
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| Record modified | 2021-03-04 |
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