Using covariance mapping to investigate the dynamics of multi-photon ionization processes of Ne atoms exposed to X-FEL pulses
Using covariance mapping to investigate the dynamics of multi-photon ionization processes of Ne atoms exposed to X-FEL pulses
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DOI：
10.1088/0953-4075/46/16/164034
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发表时间：
2013-08
期刊：
影响因子：
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通讯作者：
V. Zhaunerchyk;M. Mucke;P. Salén;P. V. Meulen;M. Kamińska;R. Squibb;L. Frasinski;M. Siano;J. Eland;P. Linusson;R. Thomas;M. Larsson;L. Foucar;J. Ullrich;K. Motomura;S. Mondal;K. Ueda;T. Osipov;L. Fang;B. Murphy;N. Berrah;C. Bostedt;J. Bozek;S. Schorb;M. Messerschmidt;J. Glownia;J. Cryan;R. Coffee;O. Takahashi;S. Wada;M. Piancastelli;R. Richter;K. Prince;R. Feifel
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文献类型：
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作者：
V. Zhaunerchyk;M. Mucke;P. Salén;P. V. Meulen;M. Kamińska;R. Squibb;L. Frasinski;M. Siano;J. Eland;P. Linusson;R. Thomas;M. Larsson;L. Foucar;J. Ullrich;K. Motomura;S. Mondal;K. Ueda;T. Osipov;L. Fang;B. Murphy;N. Berrah;C. Bostedt;J. Bozek;S. Schorb;M. Messerschmidt;J. Glownia;J. Cryan;R. Coffee;O. Takahashi;S. Wada;M. Piancastelli;R. Richter;K. Prince;R. Feifel
我们报告了一项详细的研究，研究了由斯坦福直线相干光源自由电子激光器（FEL）提供的Ne原子暴露于强飞秒x射线脉冲下的电子发射过程。采用协方差映射技术对数据进行分析，并证明了该方法能够从同一数据集的重合映射中分离出可能隐藏的线性和非线性相关特征。探索了不同的校正技术，这些技术可以提高从协方差图中提取的光谱特征的质量。最后，提出了一种基于协方差映射和模型仿真相结合的x射线FEL脉冲特性推导方法。
We report on a detailed investigation into the electron emission processes of Ne atoms exposed to intense femtosecond x-ray pulses, provided by the Linac Coherent Light Source Free Electron Laser (FEL) at Stanford. The covariance mapping technique is applied to analyse the data, and the capability of this approach to disentangle both linear and nonlinear correlation features which may be hidden on coincidence maps of the same data set is demonstrated. Different correction techniques which enable improvements on the quality of the spectral features extracted from the covariance maps are explored. Finally, a method for deriving characteristics of the x-ray FEL pulses based on covariance mapping in combination with model simulations is presented.