Collective enhancement of above threshold ionization by resonantly excited helium nanodroplets
| Autor: | Michiels, R., Abu-samha, M., Madsen, L. B., Binz, M., Bangert, U., Bruder, L., Duim, R., Wituschek, A., LaForge, A. C., Squibb, R. J., Feifel, R., Callegari, C., Fraia, M. Di, Danailov, M., Manfredda, M., Plekan, O., Prince, K. C., Rebernik, P., Zangrando, M., Stienkemeier, F., Mudrich, M. |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Michiels, R, Abu-samha, M, Madsen, L B, Binz, M, Bangert, U, Bruder, L, Duim, R, Wituschek, A, LaForge, A C, Squibb, R J, Feifel, R, Callegari, C, Fraia, M D, Danailov, M, Manfredda, M, Plekan, O, Prince, K C, Rebernik, P, Zangrando, M, Stienkemeier, F & Mudrich, M 2021 ' Collective enhancement of above threshold ionization by resonantly excited helium nanodroplets ' ArXiv . |
| Popis: | 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 (NIR) or near-ultraviolet (UV) pulses. The electron emission due to high-order ATI is enhanced by several orders of magnitude compared to He atoms. The crucial dependence of the ATI intensities with the number of excitations in the droplets suggests a local collective enhancement effect. |
| Databáze: | OpenAIRE |
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