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Transient resonant Auger-Meitner spectra of photoexcited thymine.
- Source :
-
Faraday discussions [Faraday Discuss] 2021 May 27; Vol. 228 (0), pp. 555-570. - Publication Year :
- 2021
-
Abstract
- We present the first investigation of excited state dynamics by resonant Auger-Meitner spectroscopy (also known as resonant Auger spectroscopy) using the nucleobase thymine as an example. Thymine is photoexcited in the UV and probed with X-ray photon energies at and below the oxygen K-edge. After initial photoexcitation to a ππ* excited state, thymine is known to undergo internal conversion to an nπ* excited state with a strong resonance at the oxygen K-edge, red-shifted from the ground state π* resonances of thymine (see our previous study Wolf, et al., Nat. Commun., 2017, 8, 29). We resolve and compare the Auger-Meitner electron spectra associated both with the excited state and ground state resonances, and distinguish participator and spectator decay contributions. Furthermore, we observe simultaneously with the decay of the nπ* state signatures the appearance of additional resonant Auger-Meitner contributions at photon energies between the nπ* state and the ground state resonances. We assign these contributions to population transfer from the nπ* state to a ππ* triplet state via intersystem crossing on the picosecond timescale based on simulations of the X-ray absorption spectra in the vibrationally hot triplet state. Moreover, we identify signatures from the initially excited ππ* singlet state which we have not observed in our previous study.
Details
- Language :
- English
- ISSN :
- 1364-5498
- Volume :
- 228
- Issue :
- 0
- Database :
- MEDLINE
- Journal :
- Faraday discussions
- Publication Type :
- Academic Journal
- Accession number :
- 33566045
- Full Text :
- https://doi.org/10.1039/d0fd00112k