Lorentz Meets Fano in Spectral Line Shapes: A Universal Phase and Its Laser Control
Lorentz Meets Fano in Spectral Line Shapes: A Universal Phase and Its Laser Control
复制标题
DOI：
10.1126/science.1234407
复制
发表时间：
2013-05-10
期刊：
影响因子：
56.9
通讯作者：
Pfeifer, Thomas
中科院分区：
文献类型：
--
作者：
Ott, Christian;Kaldun, Andreas;Pfeifer, Thomas
对称的洛伦兹线和非对称的法诺线形状是量化原子核、原子、分子和固体的结构和动力学性质的基本光谱特征。本研究介绍了一个通用的时间相位形式主义，映射的Fano不对称参数q的相位。时变偶极响应函数。通过激光将氦原子自电离的Fano吸收线转换为阿秒脉冲激发后的洛伦兹线，证实了该理论。我们还证明了逆，自然洛伦兹线到法诺配置文件的转换。这种形式主义的进一步应用使用量子相位控制来放大与He原子共振相互作用的极紫外光。因此，激发态的量子相位及其对相互作用的响应可以从线形分析中提取出来，在光谱学的许多分支中都有应用。
Symmetric Lorentzian and asymmetric Fano line shapes are fundamental spectroscopic signatures that quantify the structural and dynamical properties of nuclei, atoms, molecules, and solids. This study introduces a universal temporal-phase formalism, mapping the Fano asymmetry parameter q to a phase. of the time-dependent dipole response function. The formalism is confirmed experimentally by laser-transforming Fano absorption lines of autoionizing helium into Lorentzian lines after attosecond-pulsed excitation. We also demonstrate the inverse, the transformation of a naturally Lorentzian line into a Fano profile. A further application of this formalism uses quantum-phase control to amplify extreme-ultraviolet light resonantly interacting with He atoms. The quantum phase of excited states and its response to interactions can thus be extracted from line-shape analysis, with applications in many branches of spectroscopy.