Measuring picosecond excited‐state lifetimes at synchrotron sources |
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Authors: | Bertrand Fournier Philip Coppens |
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Affiliation: | Chemistry Department, University at Buffalo, State University of New York, Buffalo, NY 14260‐3000, USA |
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Abstract: | A new analysis method for the short excited‐state lifetime measurement of photosensitive species in crystals is described. Based on photocrystallographic techniques, this method is an alternative to spectroscopic methods and is also valid for non‐luminescent excited species. Two different approaches are described depending on the magnitude of the lifetime τ. For very short lifetimes below the width of the synchrotron pulse, an estimated τ can be obtained from the occurrence of the maximal system response as a function of the pump–probe delay time Δt. More precise estimates for both short and longer lifetimes can be achieved by a refinement of a model of the response as a function of the pump–probe delay time. The method also offers the possibility of the structure determination of excited species with lifetimes in the 40–100 ps range. |
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Keywords: | excited‐state lifetimes photosensitive species pump– probe delay time |
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