期刊
PHYSICAL REVIEW A
卷 104, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.104.033115
关键词
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资金
- US Department of Energy, Office of Science, Basic Energy Sciences (BES), Division of Chemical Sciences, Geosciences, and Biosciences [DE-FG02-86ER13491, DE-SC0019451]
- U.S. Department of Energy (DOE) [DE-SC0019451] Funding Source: U.S. Department of Energy (DOE)
A simple model for sequential multiphoton ionization by ultraintense x rays is presented in this study. The ion yield increases according to the power-law behavior typical of multiphoton ionization and saturates at high pulse energies. The calculated average time interval between ionizations for producing ions at a certain charge state is found to be proportional to the pulse duration and independent of all other x-ray pulse parameters, consistent with previous studies.
A simple model for sequential multiphoton ionization by ultraintense x rays is presented. The derived scaling of the ion yield with pulse energy quantitatively reproduces the experimental data, which shows that the ion yield increases according to the power-law behavior typical of multiphoton ionization, followed by saturation at high pulse energies. The calculated average time interval between ionizations for producing ions at a certain charge state is found to be proportional to the pulse duration and independent of all other x-ray pulse parameters. This agrees with previous studies where the kinetic energy of fragment ions with a given charge state produced by the intense x-ray ionization of molecules was found to be independent of the pulse energy, but to increase with a smaller pulse duration due to the smaller time interval between ionizations.
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