Phase-resolved attosecond near-threshold photoionization of molecular nitrogen - Sorbonne Université
Journal Articles Physical Review A : Atomic, molecular, and optical physics [1990-2015] Year : 2009

Phase-resolved attosecond near-threshold photoionization of molecular nitrogen

B. Fabre
E. Mével
Y. Mairesse

Abstract

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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Dates and versions

hal-01955607 , version 1 (18-12-2018)

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Stefan Haessler, B. Fabre, J. Higuet, Jérémie Caillat, T. Ruchon, et al.. Phase-resolved attosecond near-threshold photoionization of molecular nitrogen. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 2009, 80 (1), pp.011404(R). ⟨10.1103/PhysRevA.80.011404⟩. ⟨hal-01955607⟩
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