Carotenoid radical formation after multi-photon excitation of 8′-apo-β-carotenal

被引：0

作者：

Sebelik, Vaclav ^{[1
]}

Kuznetsova, Valentyna ^{[1
]}

Simova, Ivana ^{[1
]}

Polivka, Tomas ^{[1
]}

机构：

[1] Univ South Bohemia, Fac Sci, Dept Phys, Ceske Budejovice 37005, Czech Republic

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2025年 / 27卷 / 10期

关键词：

LIGHT-HARVESTING COMPLEXES; EXCITED-STATE DYNAMICS; TRANS-BETA-CAROTENE; PUMP-DUMP-PROBE; S-ASTERISK; S-1; STATE; ABSORPTION; PERIDININ; DEPENDENCE; LIFETIME;

D O I：

10.1039/d4cp04373a

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Carotenoids containing a conjugated C 00000000 00000000 00000000 00000000 11111111 00000000 11111111 00000000 00000000 00000000 O group exhibit complex excited-state dynamics that are influenced by solvent polarity due to the involvement of an intramolecular charge transfer (ICT) state. Our study explores the excited-state behavior of 8 '-apo-beta-carotenal under multi-photon excitation conditions. Using near-infrared (1300 nm) multi-photon excitation, we observe the formation of a cation radical of 8 '-apo-beta-carotenal, a process distinct from those following one-photon visible or UV excitation. Our findings suggest that this radical formation results from multi-photon excitation involving a higher-lying dark state, supported by intensity-dependent experiments. This work demonstrates that radical generation is a characteristic of this higher excited state and is not produced during relaxation from the S1/ICT state. The results open new pathways for understanding carotenoid radical formation mechanisms under intense multi-photon excitation.

引用

页码：5080 / 5086

页数：7

共 40 条

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