Ultrafast dynamics of uracil and thymine studied using a sub-10 fs deep ultraviolet laser
Ultrafast dynamics of uracil and thymine studied using a sub-10 fs deep ultraviolet laser
复制标题
使用亚 10 fs 深紫外激光研究尿嘧啶和胸腺嘧啶的超快动力学
DOI：
10.1039/c5cp07861j
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发表时间：
2016
影响因子：
3.3
通讯作者：
Ultrafast dynamics of uracil and thymine studied using a sub-10 fs deep ultraviolet laser
中科院分区：
文献类型：
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作者：
Suzuki;T.;Ultrafast dynamics of uracil and thymine studied using a sub-10 fs deep ultraviolet laser
利用啁啾脉冲四波混频技术，获得了光谱范围为255~290 nm的9.6fs深紫外光脉冲，可用作泵浦脉冲和探测脉冲。利用128通道锁定放大探测器，在全光谱范围内同时观测了尿嘧啶和胸腺嘧啶水溶液的电子激发态和振动动力学。从衰变动力学数据中得到了两个随探测光子能量逐渐增加的探测光子寿命。从第一个激发态ππ*到涉及n个π*态的最终基态，给出了通过锥形交点的超快衰变动力学。可以观察到电子基态和激发态的振动模式，它们与电子激发态的衰减动力学有很强的耦合。
Single 9.6 fs deep ultraviolet pulses with a spectral range of 255–290 nm are generated by a chirped-pulse four-wave mixing technique for use as pump and probe pulses. The electronic excited state and vibrational dynamics are simultaneously observed for an aqueous solution of uracil and thymine over the full spectral range using a 128-channel lock-in amplifier detector. Two probe photon energy-dependent lifetimes gradually increasing with the probe photon energy are obtained from the decay dynamics data. Ultrafast decay dynamics through the conical intersection is assigned from the first excited ππ* to the final ground state involving the nπ* states. Vibrational modes of the electronic ground state and excited states can be observed, which are strongly coupled to the decay dynamics of the electronic excited state.