Contour plots showing the time evolution of the probability density for propagation of electronic wave packets following tunneling ionization for rescattering (top) and escaping (bottom) electrons, in the presence (right) and absence (left) of the Coulomb potential.

From the article:

Synchronizing Terahertz Wave Generation with Attosecond Bursts
Dongwen Zhang, Zhihui Lü, Chao Meng, Xiyu Du, Zhaoyan Zhou, Zengxiu Zhao, and Jianmin Yuan
Phys. Rev. Lett. 109, 243002 (2012)

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