Femtosecond Investigation of Photophysics of Intersystem Crossing in Terthiophene
Femtosecond Investigation of Photophysics of Intersystem Crossing in Terthiophene
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三噻吩系间窜越光物理的飞秒研究
DOI：
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发表时间：
2000
期刊：
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通讯作者：
S. Rentsch
中科院分区：
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作者：
J. Yang;W. Paa;M. Hotzel;S. Rentsch
用飞秒时间分辨吸收/发射光谱研究了2，2：5，2-三噻吩（3 T）超快系间跃迁和跃迁产额随激发波长的变化.用460 nm附近的光诱导三重态吸收带的最大宽度和最大吸收带宽度的乘积来表征三重态的产率。我们发现trip let是由两种不同的过程产生的：（i）从最低振动S1态开始的著名的系间跃迁和（ii）从光激发的中间过渡态开始的超快系间跃迁。讨论了机械系统的问题和中间状态的寿命。结果表明，这种中间状态是S1人折叠中的非平面构造;这似乎有助于一代人的高效旅行。
Photophysics of ultrafast intersystem cross ing and trip let yield in 2,2 :5 ,2 -terthiophene (3T) was in ves ti gated in de pend ence of ex ci ta tion wave length by means of femto second time-resolved ab sorp t ion/emis sion spec tros copy. Trip let gen er a tion yield was mon i tored by us ing the prod uct of max i mum and width of the photoinduced trip let ab sorp tion band near 460 nm. We found that trip lets were gen er ated by two dif fer ent pro cesses: (i) the well-known intersystem cross ing from the low est vi bra tional S1 state and (ii) ultrafast intersystem cross ing from an in ter me di ate state gen er ated by photoexcitation. We dis cuss the prob a ble for ma tion mech a nism and the life time of an in ter me di ate state. The re sults sug gest that this in ter me di ate state is a nonplanar con former within the S 1 man i fold; it seems to be re spon si ble for the high ef fec tive trip let gen er a tion.