Suppressed molecular ionization for a class of diatomics in intense femtosecond laser fields

摘要: It is shown that the puzzling experimental observation of suppressed molecular ionization, in intense laser fields, ${\mathrm{O}}_{2}$, and its absence ${\mathrm{N}}_{2}$, a symmetry induced dynamical effect. More generally, it predicted ionization signal class homonuclear diatomic molecules having valence orbitals with an antibonding (e.g., ${\ensuremath{\sigma}}_{u}$, ${\ensuremath{\pi}}_{g}$) would be suppressed, but not those bonding ${\ensuremath{\sigma}}_{g}$, ${\ensuremath{\pi}}_{u}$). The suppression effect can visualized as due to effective destructive interference between two subwaves ionizing electron emerging from atomic centers.