Phase-resolved attosecond near-threshold photoionization of molecular nitrogen

By S. Haessler, B. Fabre, J. Higuet, J. Caillat, T. Ruchon, P. Breger, B. Carré, E. Constant, A. Maquet, E. Mevel and 3 more. 2009

147 citations recorded by the source corpus.

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 $0.9\ensuremath{\pi}$ shift for the electrons produced in the ionization channels leading to the $X\text{ }{^{2}\ensuremath{\Sigma}}_{g}^{+}$, ${v}^{\ensuremath{'}}=1$, and ${v}^{\ensuremath{'}}=2$ 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.

Subfields: Atomic and Molecular Physics, and Optics, Spectroscopy

View Paper: https://www.semanticscholar.org/paper/34b2fb28c0376e77a635a6a707ffe4de20ded4fc

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In Atomic and Molecular Physics, and Optics

1. A. L’Huillier
2. J. M. Dahlström
3. A. Maquet

In Spectroscopy

1. A. L’Huillier
2. J. M. Dahlström
3. A. Maquet

Citations in the corpus

• Attosecond imaging of molecular electronic wavepackets (2010, background): “or bound-state dynamics related to ultrashort-lived transient state”
• Introduction to attosecond delays in photoionization (2012, background): “Similar phaseshifts have also been found and analysed at shortlived complex continuum resonances in nitrogen molecules [110, 111].”