飞秒双色laser场对CO分子无场取向的研究
Field-free orientation of CO molecules by femtosecond two-color laser fields
摘要：
报道了在飞秒强双色（800 nm和400 nm）激光场作用下，异质双原子分子（CO）非绝热无场取向的首次实验观察。我们通过测量库仑爆炸后的碎片离子的角分布监测取向与800 nm的脉冲。分子的取向由双色场的相对相位控制。量子力学刚性转子计算的结果进行了比较。所演示的方法可与各种光谱方法（例如高次谐波产生、电子衍射和分子框架光电子发射）结合应用于研究无场条件下的分子框架动力学。
英文摘要：
We report the first experimental observation of non-adiabatic field-free orientation of a heteronuclear diatomic molecule (CO) induced by an intense two-color (800 and 400 nm) femtosecond laser field. We monitor orientation by measuring fragment ion angular distributions after Coulomb explosion with an 800 nm pulse. The orientation of the molecules is controlled by the relative phase of the two-color field. The results are compared to quantum mechanical rigid rotor calculations. The demonstrated method can be applied to study molecular frame dynamics under field-free conditions in conjunction with a variety of spectroscopy methods, such as high-harmonic generation, electron diffraction and molecular frame photoemission.
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