Attosecond pulse generation from two-electron harmonic emission spectrum*
Feng Li-Qianga),b)†, Liu Hangc)‡
       
Temporal profiles of the XUV pulses by superposing the harmonics (a) from the 70th to the 110th order or from the 110th to the 150th order, (b) from the 215th to the 255th order, and (c) from the 255th to the 295th order.