Free-free Gaunt factors of hydrogen-like ions in dense quantum plasmas
| Autor: | Jianguo Wang, Yue Ying Qi, Yong Wu, Yongjun Cheng, Sijing Zhang, Ratko K. Janev, Ju Yan Wu |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Physics of Plasmas. 27:043301 |
| ISSN: | 1089-7674 1070-664X |
| DOI: | 10.1063/1.5140830 |
| Popis: | The free-free Gaunt factors as functions of the initial electron energy e i of hydrogen-like ions are investigated, for a typical photon absorption energy of ω = 10 Ry in strongly coupled quantum plasmas, where the screened Coulomb interactions are modeled as the cosine-Debye–Huckel potentials. The free-free Gaunt factors in the strongly coupled quantum plasmas exhibit remarkably different features from the ones in the weakly coupled classical plasmas. The results of the free-free processes are featured with the resonances when the screening length κ is close to the critical screening length κ n l c(the corresponding bound state | n l 〉 merges into the continuum state when the screening length approaches the value). It is found that these resonances can be roughly classified into two types: the enhanced broad resonance and the shape-type narrow resonance. The former one appears when κ → κ n s c, where a virtual state | n s 〉 with near-zero-energy exists, while the latter one ( κ → κ n l c , l ≥ 1) is formed by the temporary capture of a continuous electron by an effective short-range potential. Note that when the screening length is close to both κ n p c and κ n s c, the Gaunt factors would exhibit a superimposition of a narrow shape-type resonance and a broad resonance. Given that the free-free Gaunt factor is a summation over the angular momentum, the main contributions of different partial waves to the resonance behavior are further analyzed. |
| Databáze: | OpenAIRE |
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