-
Complex multi-body interactions between ions and surrounding charged particles exist in hot and dense plasmas. It will screen the Coulomb potential between the nucleus and electrons, and significantly change the atomic structures and dynamic properties. This will further affect macroscopic plasma properties such as radiation opacity and the equation of state. Based on the atomic-state-dependent (ASD) screening model, we investigate the photoionization dynamic of Fe25+ ion in hot and dense plasmas. The photoionization cross section for all transition channels and total cross sections of n ≤ 2 states for Fe25+ are studied in detail, as well as the low-energy characteristics induced by plasma screening. Compared to the classical Debye Hückel model, the ASD model incorporated the degeneracy effects by inelastic collision processes, resulting in higher plasma density requirements for bound electrons to merge into the continuum. Near the threshold, the photoionization cross section obeys the Wigner threshold law after considering the screening effect. As the energy increases, the cross sections show low-energy characteristics such as shape resonance, Cooper minimum, low-energy enhancement, and Combet-Farnoux minimum, etc., which can significantly increase or decrease the cross section of the corresponding energy region. For example, the low-energy enhancement in the 2p→εs1/2 channel increases the cross section by several orders of magnitude, drastically changing the properties of the photoelectron spectrum. It is significant to study the low-energy characteristics for understanding the physical properties of the photoionization cross section. Fe is an important element in astrophysics. The cross section results in the middle and high energy region calculated by the ASD model in this paper can provide theoretical and data support for the investigation of hot and dense plasmas in Astrophysics and laboratory situations.
-
[1] Astapenko V A, Lisitsa V S 2024 Matter Radiat. Extremes 9 1
[2] Alkhimova M, Skobelev I, Pikuz T, Ryazantsev S, Sakaki H, Pirozhkov A S, Esirkepov T Z, Sagisaka A, Dover N P, Kondo K, Ogura K, Fukuda Y, Kiriyama H, Nishitani K, Pikuz S, Kando M, Kodama R, Kondo K, Nishiuchi M 2024 Matter Radiat. Extremes 9 1
[3] Berrington K A, Burke P G, Butler K, Seaton M J, Storey P J, Taylor K T, Yan Y 1987 J. Phys. B: At. Mol. Phys. 20 6379
[4] Hummer D G, Berrington K A, Eissner W, Pradhan A K, Saraph H E, Tully J A 1993 A&A 279 298
[5] Tong X M, Li J M, Pratt R H 1990 Phys. Rev. A 42 5348
[6] Zhao L B, Ho Y K 2004 Phys. Plasmas 11 1695
[7] Debye P, Hückel E 1923 Phys. Z. 24 185
[8] Salzmann D 1998 Atomic Physics in Hot Plasmas (Oxford University Press, Oxford)
[9] Sahoo S, Ho Y K 2006 Phys. Plasmas 13 1
[10] Qi Y Y, Wang J G, Janev R K 2009 Phys. Rev. A 80 1
[11] Lin C Y, Ho Y K 2010 Phys. Plasmas 17 1
[12] Wu C, Zhou F, Yan J, Gao X, Wu Y, Zeng C, Wang J 2024 Chinese Phys. Lett. 41 1
[13] Zhou F Y, Qu Y Z, Gao J W, Ma Y L, Wu Y, Wang J G 2021 Commun. Phys. 4 1
[14] Lu S M, Zhou F Y, Xie L Y, Ma Y L, Zhao G P, Gao X, Wu Y, Wang J G 2024 Phys. Rev. E 109 1
[15] Ichimaru S 1982 Rev. Mod. Phys. 54 1017
[16] Zhou F 2021
[17] Dyall K G, Grant I P, Johnson C T, Parpia F A, Plummer E P 1989 Comput. Phys. Commun. 55 425
[18] Jönsson P, He X, Froese Fischer C, Grant I P 2007 Comput. Phys. Commun. 177 597
[19] Tews M G, Perger W F 2001 Comput. Phys. Commun. 141 205
[20] Perger W F, Halabuka Z, Trautmann D 1993 Comput. Phys. Commun. 76 250
[21] Grant I P 1974 J. Phys. B: Aom. Molec. Phys. 7 1458
[22] Zhao G P, Xie L Y, Liu L, Wang J G, Janev R K 2018 Phys. Plasmas 25 1
[23] Xie L Y, Wang J G, Janev R K 2014 Phys. Plasmas 21 1
[24] Bethe H A, Salpeter E E 1957 Quantum mechanics of one- and two-electron atoms (New York: Academic Press)
[25] Fano U, Cooper J W 1968 Rev. Mod. Phys. 40 441
[26] Wigner E P 1948 Phys. Rev. 73 1002
[27] Bylicki M, Stachów A, Karwowski J, Mukherjee P K 2007 Chemical Physics 331 346
[28] Joachain 1975 Quantum collision theory (New York: American Elsevier)
[29] Taylor J R 1972 Scattering Theory (John Wiley, New York)
Metrics
- Abstract views: 144
- PDF Downloads: 0
- Cited By: 0
下载:
