Joint Laboratory for Attosecond Science, National Research Council of Canada and University of Ottawa, 100 Sussex Drive, Ottawa, Ontario, Canada K1A 0R6.
Phys Rev Lett. 2010 Sep 3;105(10):103002. doi: 10.1103/PhysRevLett.105.103002. Epub 2010 Sep 1.
We report the time-resolved observation of the photodissociation of Br2 using high-harmonic generation (HHG) as a probe. The simultaneous measurement of the high-harmonic and ion yields shows that high harmonics generated by the electronically excited state interfere with harmonics generated by the ground state. The resulting homodyne effect provides a high sensitivity to the excited state dynamics. We present a simple theoretical model that accounts for the main observations. Our experiment paves the way towards the dynamic imaging of molecules using HHG.
我们报告了使用高次谐波产生（HHG）作为探针对 Br2 光解的时间分辨观察。高次谐波和离子产率的同时测量表明，电子激发态产生的高次谐波与基态产生的高次谐波相干扰。由此产生的同频效应提供了对激发态动力学的高灵敏度。我们提出了一个简单的理论模型，解释了主要的观察结果。我们的实验为使用 HHG 对分子进行动态成像铺平了道路。
