Journal
PHYSICAL REVIEW LETTERS
Volume 127, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.127.093201
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [STI 125/19-2, STI 125/22-2]
- Carlsberg Foundation
- Swedish Research Council (VR)
- Knut and AliceWallenberg Foundation
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Clusters and nanodroplets have the potential to enhance high-order nonlinear optical effects due to their high local density, but only moderate enhancement has been achieved so far. By using ultrashort extreme ultraviolet (XUV) free-electron laser pulses to resonantly excite helium (He) nanodroplets, a significant increase in energetic electron emission compared to He atoms has been observed. This suggests a local collective enhancement effect dependent on the number of excitations in the droplets.
Clusters and nanodroplets hold the promise of enhancing high-order nonlinear optical effects due to their high local density. However, only moderate enhancement has been demonstrated to date. Here, we report the observation of energetic electrons generated by above-threshold ionization (ATI) of helium (He) nanodroplets which are resonantly excited by ultrashort extreme ultraviolet (XUV) free-electron laser pulses and subsequently ionized by near-infrared (MR) or near-ultraviolet (UV) pulses. The electron emission due to high-order ATI is enhanced by several orders of magnitude compared with He atoms. The crucial dependence of the ATI intensities with the number of excitations in the droplets suggests a local collective enhancement effect.
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