强圆偏振飞秒脉冲laser电离一维和三维取向非对称陀螺分子
Ionization of 1D and 3D oriented asymmetric top molecules by intense circularly polarized femtosecond laser pulses
摘要：
采用圆偏振非共振飞秒激光脉冲对三维取向非对称陀螺分子苯甲腈（C $_7$ H $_5$ N）的强场电离进行了实验和理论研究.在与强场相互作用之前，使用偏转器对分子进行量子态选择，并使用椭圆偏振激光脉冲结合静态电场对分子进行三维（3D）排列和定向。在分子框架光电子动量分布的特征分裂揭示了电离发生的分子轨道的节面的位置。实验结果支持的理论隧道模型，包括和量化的分裂的动量分布。本文的重点是了解强场电离从三维取向的非对称顶部分子，特别是抑制电子发射的节面的分子轨道。在前一篇文章[Dimitrovski等人，A83，023405（2011）]，重点是理解一维取向的极性分子的强场电离，特别是光电子发射方向上的不对称性。
英文摘要：
We present a combined experimental and theoretical study on strong-field ionization of a three-dimensionally oriented asymmetric top molecule, benzonitrile (C$_7$H$_5$N), by circularly polarized, nonresonant femtosecond laser pulses. Prior to the interaction with the strong field, the molecules are quantum-state selected using a deflector, and 3-dimensionally (3D) aligned and oriented adiabatically using an elliptically polarized laser pulse in combination with a static electric field. A characteristic splitting in the molecular frame photoelectron momentum distribution reveals the position of the nodal planes of the molecular orbitals from which ionization occurs. The experimental results are supported by a theoretical tunneling model that includes and quantifies the splitting in the momentum distribution. The focus of the present article is to understand strong-field ionization from 3D-oriented asymmetric top molecules, in particular the suppression of electron emission in nodal planes of molecular orbitals. In the preceding article [Dimitrovski et al., Phys. Rev. A 83, 023405 (2011)] the focus is to understand the strong-field ionization of one-dimensionally-oriented polar molecules, in particular asymmetries in the emission direction of the photoelectrons.
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