期刊
PHYSICAL REVIEW A
卷 80, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.80.011404
关键词
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资金
- EU LASERLAB program
- ATTO-WAVE ANR program
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 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 often not accessible otherwise.
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