High-Energy Cutoff in the Spectrum of Strong-Field Nonsequential Double Ionization
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Publisher:American Physical Society
Citation:J. S. Parker et al, "High-Energy Cutoff in the Spectrum of Strong-Field Nonsequential Double Ionization," Physical Review Letters 96, no. 13 (2006), doi:10.1103/PhysRevLett.96.133001
Electron energy distributions of singly and doubly ionized helium in an intense 390 nm laser field have been measured at two intensities (0.8 PW/cm^2 and 1.1 PW/cm^2, where PW≡1015 W/cm^2). Numerical solutions of the full-dimensional time-dependent helium Schrödinger equation show excellent agreement with the experimental measurements. The high-energy portion of the two-electron energy distributions reveals an unexpected 5U_p cutoff for the double ionization (DI) process and leads to a proposed model for DI below the quasiclassical threshold.