Excited state lifetime

Ebook "Molecular conformation and organic photochemistry: Time-resolved photoionization studies" digs into the fundamental issue of how the shape of a molecule relates to its photochemical reactivity. This relation is drastically different from that of ground-state chemistry, since lifetimes of excited states are often comparable to or even shorter than the time scales of conformational changes.

129p coduathanh1122 27-03-2024 1 1   Download

In the study of nuclear structure, the fast timing technique can be used to measure the lifetime of excited states. In the paper, we have developed a new fast timing system, which is made up of two LaBr3:Ce detectors and a set of waveform sampling system. The sampling system based on domino ring sampler version 4 chip (DRS4) can digitize and store the waveform information of detector signal, with a smaller volume and higher timing accuracy, and the waveform data are performed by means of digital waveform analysis methods.

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Absorption of light (W or visible) by the ground state of a molecule (So) generates electronically excited states, either directly (the singlet states) or after intersystem crossing from the singlet manifold (the triplet states). Alternatively, triplet states may be generated by energy transfer from another excited state (a sensitiser). In both multiplicities, very fast internal conversion leads to the lowest states (S1 and TI respectively). These states, although still quite short lived (typical lifetime 610-8 s for S1 and ...

338p thienbinh1311 13-12-2012 45 4   Download