Ultrafast dynamics of o-bromofluorobenzene studied by time-resolved photoelectron imaging.
Ultrafast dynamics of o-bromofluorobenzene studied by time-resolved photoelectron imaging.
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DOI：
10.1002/cphc.200900096
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发表时间：
2009-06
期刊：
影响因子：
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通讯作者：
Zhenzhou Cao;Zhengrong Wei;LinQiang Hua;Chang‐jin Hu;Song Zhang;Bing Zhang
中科院分区：
文献类型：
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作者：
Zhenzhou Cao;Zhengrong Wei;LinQiang Hua;Chang‐jin Hu;Song Zhang;Bing Zhang
用飞秒时间分辨光电子成像技术研究了邻溴氟苯的光解离动力学和旋转波包相干性。不同光电子环的衰变显示了态的布居衰变，由此确定了不同态的寿命。利用飞秒时间分辨光电子成像(TRPEI)光谱结合(1+2‘)共振增强多光子电离(REMPI)研究了邻溴氟苯的光解离动力学和旋转波包相干。光电子动能和角分布表明，在(1+1‘)光子能量下，某些里德堡态的电离动力学。由光电子信号的衰变确定了S(1)(A‘)和T(2)(A’)态的寿命分别为38ps和27ps。这两个态的电子布居衰变归因于预解离和隧穿解离。前5ps各向异性参数随时间的变化显示了分子的旋转波相干性。
Photodissociation dynamics and rotational wave packet coherences of o-bromofluorobenzene are studied by femtosecond time-resolved photoelectron imaging [figure: see text]. The decay of different photoelectron rings shows the population decay of states from which the lifetimes of different states are determined. The variation of photoelectron angular distributions reflects the evolution of rotational coherences.Photodissociation dynamics and rotational wave packet coherences of o-bromofluorobenzene are studied by femtosecond time-resolved photoelectron imaging (TR-PEI) spectroscopy combined with the (1+2') resonance-enhanced multiphoton ionization (REMPI). Photoelectron kinetic energy and angular distributions indicate ionization dynamics from some Rydberg states at the (1+1') photon energy. The lifetimes of the S(1) (A') and T(2) (A') states are determined from the decay of the photoelectron signals to be 38 ps and 27 ps. The electron population decay of the two states is attributed to predissociation and tunneling dissociation. The variation of time-dependent anisotropy parameters in the first 5 ps shows the rotational wave coherences of molecule.