Dissociative ionization of H2 + in an intense laser field: Charge-resonance-enhanced ionization, Coulomb explosion, and harmonic generation at 600 nm.

摘要: The time-dependent Schr\"odinger equation for ${\mathrm{H}}_{2}$${\mathrm{}}^{+}$ in a 600-nm, intense (I\ensuremath{\geqslant}${10}^{14}$ W/${\mathrm{cm}}^{2}$) laser field is solved numerically model which uses the exact three-body Hamiltonian with one-dimensional nuclear motion restricted to direction of electric and three-dimensional electronic motion. High ionization rates are found, exceeding those neutral atomic hydrogen. This confirms, by rigorous, full dynamical calculation, recently discovered charge-resonance-enhanced (CREI)---all previous demonstrations CREI were based on ``frozen nuclei'' model. numerical kinetic-energy spectra dissociating fragments compared recent experimental results. They can be interpreted simple bond softening mechanism (or laser-induced avoided crossing dressed-state representation), binding forces completely suppressed strong thus move as free particles kinetic energy close their initial vibrational until they reach critical distance R=${\mathit{R}}_{\mathit{c}}$\ensuremath{\cong}8 bohr, where rapidly ionized, due CREI. harmonic generation calculated from our non-Born-Oppenheimer simulations show that high harmonics also generated when nuclei cross this R=${\mathit{R}}_{\mathit{c}}$. \textcopyright{} 1996 American Physical Society.