TY - JOUR
T1 - The dynamics of the S1 excited states of carotenoids
AU - Frank, Harry A.
AU - Farhoosh, Roya
AU - Gebhard, Ronald
AU - Lugtenburg, Johan
AU - Gosztola, David
AU - Wasielewski, Michael R.
PY - 1993/5/14
Y1 - 1993/5/14
N2 - Transient absorption spectroscopy was used to measure the S1 dynamics of four all-trans-carotenoids: 3,4,7,8-tetrahydrospheroidene, 3,4,5,6-tetrahydrospheroidene, 3,4-dihydrospheroidene and spheroidene. After excitation into the S2 state and subsequent relaxation to the S1 state, the S1 → Sn electronic absorption bands in the region 460-520 nm were probed and observed to decay with single-exponential kinetics: τ = 407 ± 23 ps for 3,4,7,8-tetrahydrospheroidene, 85 ± 5 ps for 3,4,5,6-tetrahydrospheroidene, 25.4 ± 0.9 ps for 3,4-dihydrospheroidene and 8.7 ± 0.1 ps for spheroidene. These data are discussed in three contexts: (1) as a test of the adherence of carotenoids to the energy gap law; (2) as a means of determining the S1 state energy of spheroidene, which appears to be at 14100 cm-1; and (3) in terms of the constraints placed on the efficiencies of carotenoid-to-chlorophyll energy transfer in photosynthetic systems.
AB - Transient absorption spectroscopy was used to measure the S1 dynamics of four all-trans-carotenoids: 3,4,7,8-tetrahydrospheroidene, 3,4,5,6-tetrahydrospheroidene, 3,4-dihydrospheroidene and spheroidene. After excitation into the S2 state and subsequent relaxation to the S1 state, the S1 → Sn electronic absorption bands in the region 460-520 nm were probed and observed to decay with single-exponential kinetics: τ = 407 ± 23 ps for 3,4,7,8-tetrahydrospheroidene, 85 ± 5 ps for 3,4,5,6-tetrahydrospheroidene, 25.4 ± 0.9 ps for 3,4-dihydrospheroidene and 8.7 ± 0.1 ps for spheroidene. These data are discussed in three contexts: (1) as a test of the adherence of carotenoids to the energy gap law; (2) as a means of determining the S1 state energy of spheroidene, which appears to be at 14100 cm-1; and (3) in terms of the constraints placed on the efficiencies of carotenoid-to-chlorophyll energy transfer in photosynthetic systems.
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U2 - 10.1016/0009-2614(93)85016-H
DO - 10.1016/0009-2614(93)85016-H
M3 - Article
AN - SCOPUS:0002932379
VL - 207
SP - 88
EP - 92
JO - Chemical Physics Letters
JF - Chemical Physics Letters
SN - 0009-2614
IS - 1
ER -