1. Phase-resolved attosecond near-threshold photoionization of molecular nitrogen
- Author
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Haessler, S., Fabre, B., Higuet, J., Caillat, J., Ruchon, T., Breger, P., Carré, B., Constant, E., Maquet, A., Mével, E., Salières, P., Taïeb, R., and Mairesse, Y.
- Subjects
Physics - Atomic Physics - 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 0.76 $\pi$ shift for the electrons produced in the ionization channels leading to the X$^2 \Sigma_g^+$, $v'=1$ 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 hardly accessible otherwise.
- Published
- 2022
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