Time-resolved photoelectron spectroscopy of the CH(3)I B(1)E 6s [2] state.
Time-resolved photoelectron spectroscopy of the CH(3)I B(1)E 6s [2] state.
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CH(3)I B(1)E 6s [2] 态的时间分辨光电子能谱。
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
S. Pratt
中科院分区：
文献类型：
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作者：
N. Thiré;R. Cireasa;V. Blanchet;S. Pratt
利用飞秒分辨光电子速度图成像技术研究了CH（3）I分子6s（B（2）E）里德堡态无振动能级的预解离动力学.通过监测光电离B态产生的CH（3）I（+）的衰变，测得预解离寿命为1310 ± 70 fs。记录光电子光谱作为激发方案的函数（一个或两个光子到B状态），以及作为电离波长的函数。所有这些光电子能谱都表现出与CH（3）I（+）离子信号衰减时间一致的简单时间依赖性。B态的光电子角分布依赖于激发方案和电离波长，并表现出强烈的依赖于所产生的CH（3）I（+）中激发的振动模式。在长延迟下，光电子能谱的特征是由B态预解离形成的I（（2）P（1/2））碎片的光电离。
The predissociation dynamics of the vibrationless level of the 6s (B (2)E) Rydberg state of CH(3)I was studied by femtosecond-resolved velocity map imaging of photoelectrons. By monitoring the decay of the CH(3)I(+) produced by photoionizing the B state, the predissociation lifetime was measured to be 1310 ± 70 fs. Photoelectron spectra were recorded as a function of the excitation scheme (one or two photons to the B state), and as a function of the ionizing wavelength. All of these photoelectron spectra show a simple time dependence that is consistent with the decay time of the CH(3)I(+) ion signal. The photoelectron angular distributions for the ionization of the B state depend on the excitation scheme and the ionizing wavelength, and show a strong dependence on the vibrational modes excited in the resulting CH(3)I(+). At long delays, the photoelectron spectra are characterized by photoionization of the I((2)P(1/2)) fragment formed by predissociation of the B state.