论文标题
无反转对称性的Attsond瞬时吸收光谱
Attosecond Transient Absorption Spectroscopy without Inversion Symmetry
论文作者
论文摘要
瞬态吸收是在原子，分子和固体的Attosend实验中非常强大的可观察到的，并且经常用于采用源自高谐波产生的相锁定的少量循环红外和XUV激光脉冲的实验。我们在数值和分析上表明，在非中心对称系统中，例如许多多原子分子，由于缺乏奇偶校能保存而启用了通道干扰，从而导致新的光谱吸收特征，这直接揭示了激光电场。 Attosend瞬时吸收光谱（ATA）扩展到此类靶标，因此对全球和局部反转对称性敏感。我们预计ATA会在非中心对称系统中找到新的应用，其中红外脉冲的载体到嵌入阶段成为相关参数，并且可以解决样品的方向和分子的电子对称性的方向。
Transient absorption is a very powerful observable in attosecond experiments on atoms, molecules and solids and is frequently used in experiments employing phase-locked few-cycle infrared and XUV laser pulses derived from high harmonic generation. We show numerically and analytically that in non-centrosymmetric systems, such as many polyatomic molecules, which-way interference enabled by the lack of parity conservation leads to new spectral absorption features, which directly reveal the laser electric field. The extension of Attosecond Transient Absorption Spectroscopy (ATAS) to such targets hence becomes sensitive to global and local inversion symmetry. We anticipate that ATAS will find new applications in non-centrosymmetric systems, in which the carrier-to-envelope phase of the infrared pulse becomes a relevant parameter and in which the orientation of the sample and the electronic symmetry of the molecule can be addressed.
