Singlet Triplet-Pair Production and Possible Singlet-Fission in Carotenoids.
Singlet Triplet-Pair Production and Possible Singlet-Fission in Carotenoids.
复制标题
类胡萝卜素中单线态三重态对的产生和可能的单线态裂变。
DOI:
10.1021/acs.jpclett.1c03812
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发表时间:
2022-02-10
影响因子:
5.7
通讯作者:
Barford, William
中科院分区:
文献类型:
--
作者:
Manawadu, Dilhan;Valentine, Darren J.;Marcus, Max;Barford, William
Internal conversion from the photoexcited state to a correlated singlet triplet-pair state is believed to be the precursor of singlet fission in carotenoids. We present numerical simulations of this process using a π-electron model that fully accounts for electron–electron interactions and electron–nuclear coupling. The time-evolution of the electrons is determined rigorously using the time-dependent density matrix renormalization group method, while the nuclei are evolved via the Ehrenfest equations of motion. We apply this to zeaxanthin, a carotenoid chain with 18 fully conjugated carbon atoms. We show that the internal conversion of the primary photoexcited state, S2, to the singlet triplet-pair state occurs adiabatically via an avoided crossing within ∼50 fs with a yield of ∼60%. We further discuss whether this singlet triplet-pair state will undergo exothermic versus endothermic intra- or interchain singlet fission.
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影响因子:
15
作者:
Musser, Andrew J.;Al-Hashimi, Mohammed;Clark, Jenny
通讯作者:
Clark, Jenny
影响因子:
2.8
作者:
Rondonuwu, FS;Watanabe, Y;Koyama, Y
通讯作者:
Koyama, Y
影响因子:
3.7
作者:
TAVAN, P;SCHULTEN, K
通讯作者:
SCHULTEN, K
影响因子:
2.8
作者:
HUDSON, BS;KOHLER, BE
通讯作者:
KOHLER, BE
影响因子:
3.7
作者:
Barford, W;Bursill, RJ;Lavrentiev, MY
通讯作者:
Lavrentiev, MY