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arXiv 0810.2322physics.atom-phphysics.optics
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阿秒光电离和康普顿散射的统一从头计算

Unified ab initio treatment of attosecond photoionization and Compton scattering

G. L. Yudin, D. I. Bondar, S. Patchkovskii, P. B. Corkum, A. D. Bandrauk

备注：
15 pages, 5 figures
发表信息：
J. Phys. B 42, 205601 (2009)
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摘要：

提出了一种新的理论方法来研究阿秒激光辅助的光电离和康普顿电离。阿秒X射线吸收和散射由$\hat{\mathrsfs{S}}^{(1,2)}$ -矩阵描述，该矩阵是激光修改的Furry表示中的“单色”$\hat{S}^{(1,2)}$ -矩阵的相干叠加。除了完善现有的软X射线光电子阿秒条纹相机和光谱相位干涉术（ASC和ASPI）的理论，我们制定了硬X射线光电子和康普顿ASC和ASPI的理论。由此产生的计划有一个简单的结构，并导致电离振幅的封闭形式的表达式。本文研究了库仑-沃尔科夫连续介质中的康普顿电子干涉，其中库仑场和激光场都是非微扰的。我们发现，在低于10 $^{13}$ Wcm $^{-2}$的激光场强度的归一化康普顿线几乎与在无激光制度中获得的线重合。在更高的强度，阿秒干扰生存整合超过电子动量，并在康普顿线本身的特点突出。我们定义了一个制度，电子基态密度可以测量的阿秒时间间隔的可控精度。新理论为从实验数据中提取光电子和康普顿电子相以及原子和分子波函数提供了坚实的基础。

英文摘要：

We present a new theoretical approach to attosecond laser-assisted photo- and Compton ionization. Attosecond x-ray absorption and scattering are described by $\hat{\mathrsfs{S}}^{(1,2)}$-matrices, which are coherent superpositions of "monochromatic" $\hat{S}^{(1,2)}$-matrices in a laser-modified Furry representation. Besides refining the existing theory of the soft x-ray photoelectron attosecond streak camera and spectral phase interferometry (ASC and ASPI), we formulate a theory of hard x-ray photoelectron and Compton ASC and ASPI. The resulting scheme has a simple structure and leads to closed-form expressions for ionization amplitudes. We investigate Compton electron interference in the separable Coulomb-Volkov continuum with both Coulomb and laser fields treated non-perturbatively. We find that at laser-field intensities below 10$^{13}$ Wcm$^{-2}$ normalized Compton lines almost coincide with the lines obtained in the laser-free regime. At higher intensities, attosecond interferences survive integration over electron momenta, and feature prominently in the Compton lines themselves. We define a regime where the electron ground-state density can be measured with controllable accuracy in an attosecond time interval. The new theory provides a firm basis for extracting photo- and Compton electron phases and atomic and molecular wavefunctions from experimental data.

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