Laser-assisted XUV double ionization of helium atoms: Intensity dependence of joint angular distributions
Zhu Fengzheng1, 2, Li Genliang1, Liu Aihua1, †
       

Joint angular distributions of two photoelectrons at equal energy sharing with odd-parity (a)–(c) and even parity (d)–(f) for different assisting-IR laser field intensities: (a), (d) IIR = 1010 W/cm2, (b), (e) IIR = 1011 W/cm2, and (c), (f) IIR = 1012 W/cm2, and the peak intensity of XUV laser field is 1013 W/cm2. The rest parameters are the same as those in Fig. 1.