氩气中的多边带RABBIT
Multi-Sideband RABBIT in Argon
摘要：
我们报告了一个联合的实验和理论研究的三边带（3-SB）修改的“重建阿秒拍的双光子跃迁干涉”（RABBIT）设置。3-SB RABBIT方案使得有可能调查的相位所造成的连续不同的订单之间的过渡的干扰。此外，该方法的优势在于其通过比较从由两个相邻谐波形成的特定SB组提取的RABBIT相位来仅关注原子相位的能力，而与谐波中的啁啾无关。我们验证早期的预测，相位和相应的时间延迟在三个SB提取的角度积分测量变得相似，随着光子电子能量的增加。在三个SB中的RABBIT相位的角度依赖性的变化的结果从不同的维格纳和连续-连续耦合相位与各个角动量通道。这种依赖性的定性解释试图通过调用的倾向规则。从R-矩阵（紧密耦合）与时间依赖性计算的实验数据和预测之间的比较表明所观察到的趋势定性一致。
英文摘要：
We report a joint experimental and theoretical study of a three-sideband (3-SB) modification of the "reconstruction of attosecond beating by interference of two-photon transitions" (RABBIT) setup. The 3-SB RABBIT scheme makes it possible to investigate phases resulting from interference between transitions of different orders in the continuum. Furthermore, the strength of this method is its ability to focus on the atomic phases only, independent of a chirp in the harmonics, by comparing the RABBIT phases extracted from specific SB groups formed by two adjacent harmonics. We verify earlier predictions that the phases and the corresponding time delays in the three SBs extracted from angle-integrated measurements become similar with increasing photon electron energy. A variation in the angle dependence of the RABBIT phases in the three SBs results from the distinct Wigner and continuum-continuum coupling phases associated with the individual angular momentum channels. A qualitative explanation of this dependence is attempted by invoking a propensity rule. Comparison between the experimental data and predictions from an R-matrix (close-coupling) with time dependence calculation shows qualitative agreement in the observed trends.
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