Phase-resolved attosecond near-threshold photoionization of molecular nitrogen
Résumé
We photoionize nitrogen molecules with a train of extreme ultraviolet attosecond pulses together with a weak infrared field. We measure the phase of the two-color two-photon ionization transition (molecular phase) for different states of the ion. We observe a 0.9π shift for the electrons produced in the ionization channels leading to the $X^{2}$$Σ^{+}_{g}$, v′=1, and v′=2 states. We relate this phase shift to the presence of a complex resonance in the continuum. By providing both a high spectral and temporal resolution, this general approach gives access to the evolution of extremely short-lived states, which is often not accessible otherwise.
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