Relaxation dynamics of high-energy excited states of carotenoids studied by UV excitation and pump-repump-probe transient absorption spectroscopy

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12310%2F23%3A43906676" target="_blank" >RIV/60076658:12310/23:43906676 - isvavai.cz</a>

Result on the web

<a href="https://pubs.rsc.org/en/content/articlelanding/2023/CP/D3CP02485G" target="_blank" >https://pubs.rsc.org/en/content/articlelanding/2023/CP/D3CP02485G</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/d3cp02485g" target="_blank" >10.1039/d3cp02485g</a>

Result language

angličtina

Original language name

Relaxation dynamics of high-energy excited states of carotenoids studied by UV excitation and pump-repump-probe transient absorption spectroscopy

Original language description

The excited states of carotenoids have been a subject of numerous studies. While a majority of these reports target the excited state dynamics initiated by the excitation of the S-2 state, the upper excited state(s) absorbing in the UV spectral region (denoted as S-UV) has been only scarcely studied. Moreover, the relation between the S-UV and S-n, the final state of the well-known S-1-S-n transition of carotenoids, remains unknown. To address this yet-unresolved issue, we compared the excited state dynamics of two carotenoids, namely, &amp; beta;-carotene and astaxanthin, after excitation of either the S-UV or S-n state. The S-UV state was excited directly by UV light, and the excitation of the S-n state was achieved via re-pumping the S-1-S-n transition. The results indicated that direct S-UV excitation produces an S-1-S-n band that is significantly broader than that obtained after S-2 excitation, most probably due to the generation of multiple S-1 conformations produced by excess energy. No such broadening is observed if the S-n state is excited by the re-pump pulse. This shows that the S-n and S-UV states are different, each initializing a specific relaxation pathway. We propose that the S-n state retains the coupled triplet pair character of the S-1 state, while the S-UV state is the higher state of Bu+ symmetry accessible by one-photon transition.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10403 - Physical chemistry

Project

<a href="/en/project/GX19-28323X" target="_blank" >GX19-28323X: Relation between structure and function of carotenoids: New pathways to answer unresolved questions</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Physical Chemistry Chemical Physics

ISSN

1463-9076

e-ISSN

—

Volume of the periodical

25

Issue of the periodical within the volume

33

Country of publishing house

GB - UNITED KINGDOM

Number of pages

9

Pages from-to

22336-22344

UT code for WoS article

001047562100001

EID of the result in the Scopus database

2-s2.0-85168780503