期刊
PHYSICAL REVIEW LETTERS
卷 127, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.127.213202
关键词
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资金
- Chemical Sciences, Geosciences and Biosciences Division, Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy [DE-SC0012376]
- SLAC National Accelerator Laboratory - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-76SF00515]
- Academy of Finland
- Volkswagen Foundation
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)-SFB-925 [170620586]
- EU Framework Programme for Research and Innovation HORIZON 2020 [730872]
In this study, nonlinear ionization of argon atoms in the short wavelength regime using ultraintense x rays from the European XFEL is reported. A new two-color resonance-enhanced multiphoton ionization process was discovered.
Here, we report on the nonlinear ionization of argon atoms in the short wavelength regime using ultraintense x rays from the European XFEL. After sequential multiphoton ionization, high charge states are obtained. For photon energies that are insufficient to directly ionize a 1s electron, a different mechanism is required to obtain ionization to Ar17+. We propose this occurs through a two-color process where the second harmonic of the FEL pulse resonantly excites the system via a 1s -> 2p transition followed by ionization by the fundamental FEL pulse, which is a type of x-ray resonance-enhanced multiphoton ionization (REMPI). This resonant phenomenon occurs not only for Ar16+, but also through lower charge states, where multiple ionization competes with decay lifetimes, making x-ray REMPI distinctive from conventional REMPI. With the aid of state-of-the-art theoretical calculations, we explain the effects of x-ray REMPI on the relevant ion yields and spectral profile.
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