Photoelectron Circular Dichroism of Bicyclic Ketones from Multiphoton Ionization with Femtosecond Laser Pulses
Photoelectron Circular Dichroism of Bicyclic Ketones from Multiphoton Ionization with Femtosecond Laser Pulses
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DOI：
10.1002/cphc.201402643
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发表时间：
2015-01-12
期刊：
影响因子：
2.9
通讯作者：
Baumert, Thomas
中科院分区：
文献类型：
--
作者：
Lux, Christian;Wollenhaupt, Matthias;Baumert, Thomas
光电子圆二色性（PECD）是一种高达10%的CD效应，当多光子电离与单光子电离相比时，它显示出高阶勒让德多项式的贡献。我们全面介绍了测量多光子PECD的实验方法，并推导出我们应用于樟脑、小茴香酮和降樟脑的定量测量方法。不同的调制和幅度的贡献勒让德多项式的观察，尽管在化学结构的相似性。此外，我们研究了采用层析重建方法的椭圆偏振光PECD。强度研究揭示了解离电离作为所观察到的PECD效应的起源，而中间共振的电离是主要的信号。作为一个展望，我们建议利用我们的层析数据作为一个完整的光电离实验的实验基础，并给出了一个前景的PECD作为一种分析工具。
Photoelectron circular dichroism (PECD) is a CD effect up to the ten-percent regime and shows contributions from higher-order Legendre polynomials when multiphoton ionization is compared to single-photon ionization. We give a full account of our experimental methodology for measuring the multiphoton PECD and derive quantitative measures that we apply on camphor, fenchone and norcamphor. Different modulations and amplitudes of the contributing Legendre polynomials are observed despite the similarity in chemical structure. In addition, we study PECD for elliptically polarized light employing tomographic reconstruction methods. Intensity studies reveal dissociative ionization as the origin of the observed PECD effect, whereas ionization of the intermediate resonance is dominating the signal. As a perspective, we suggest to make use of our tomographic data as an experimental basis for a complete photoionization experiment and give a prospect of PECD as an analytic tool.