Ionization potential depression and ionization balance in dense carbon plasma under solar and stellar interior conditions
Ionization potential depression and ionization balance in dense carbon plasma under solar and stellar interior conditions
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DOI：
10.1051/0004-6361/202039308
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
袁建民
中科院分区：
文献类型：
--
作者：
曾交龙;李永军;侯永;高城;袁建民
Recent quantitative experiments on the ionization potential depression (IPD) in dense plasma show that the observational results are.difficult to explain with the widely used analytical models for plasma screening. Here, we investigate the effect of plasma screening.on the IPD and ionization balance of dense carbon plasma under solar and stellar interior conditions using our developed consistent.nonanalytical model. The screening potential can be primarily attributed to the free electrons in the plasma and is determined by.the microspace distribution of these free electrons. The ionization balance is determined by solving the Saha equation, including the.effect of IPD. The predicted IPD and average ionization degree are larger than those obtained using the Stewart–Pyatt model for mass.densities that are greater than 3.0 g cmm3.. Under solar interior conditions, our results are in better agreement with the Ecker–Kröll.model at electron temperatures and densities lower than 250 eV and 2.1 × 1023 cmm3.and in the best agreement with the ion-sphere.model at 303 eV and 4.3 × 1023 cmm3.. Finally, our results are compared with those obtained via a recent experiment on a CH-mixture.plasma that has been compressed six times. The predicted average ionization degree of C in a CH mixture agrees better with the.experiment than the Stewart–Pyatt and Thomas–Fermi models when the screening from free electrons contributed by hydrogen atoms.is included. Our results provide useful information concerning the ionization balance and can be applied to investigate the opacity and.equations of state for dense plasma under the solar and stellar interior conditions.
