Effect of ionization and recombination coefficients on the charge-state distribution of ions in laser-produced aluminum plasmas
Effect of ionization and recombination coefficients on the charge-state distribution of ions in laser-produced aluminum plasmas
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DOI：
10.1103/physreve.56.2104
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发表时间：
1997-08
影响因子：
2.4
通讯作者：
G. Gupta;B. Sinha
中科院分区：
文献类型：
--
作者：
G. Gupta;B. Sinha
Various formulations for the ionization and recombination coefficients reported and used in the literature have been compared for laser-produced Al plasmas. Taking into account these formulations, the charge-state distribution of the plasma ions existing in various ionization states through their fractional densities and average charge state has been studied. The local thermodynamic, corona, and collisional-radiative equilibria are considered for the ionization model. Numerical results for Al plasmas with electron temperatures of 0.1{endash}1.0 keV and electron densities of 10{sup 20}{endash}10{sup 22}cm{sup {minus}3} are presented and discussed. It is observed that the several formulations for the ionization and recombination coefficients predict variously their rates. The consideration of these formulations in an ionization model is noted to significantly modify the charge-state distribution of the ions. It is further noted that the corona equilibrium model can be safely applied to laser plasmas with electron densities less than or equal to 10{sup 22}cm{sup {minus}3} for estimating the abundance of high-charge ions relevant to x-ray line radiation studies. {copyright} {ital 1997} {ital The American Physical Society}
Various formulations for the ionization and recombination coefficients reported and used in the literature have been compared for laser-produced Al plasmas. Taking into account these formulations, the charge-state distribution of the plasma ions existing in various ionization states through their fractional densities and average charge state has been studied. The local thermodynamic, corona, and collisional-radiative equilibria are considered for the ionization model. Numerical results for Al plasmas with electron temperatures of 0.1{endash}1.0 keV and electron densities of 10{sup 20}{endash}10{sup 22}cm{sup {minus}3} are presented and discussed. It is observed that the several formulations for the ionization and recombination coefficients predict variously their rates. The consideration of these formulations in an ionization model is noted to significantly modify the charge-state distribution of the ions. It is further noted that the corona equilibrium model can be safely applied to laser plasmas with electron densities less than or equal to 10{sup 22}cm{sup {minus}3} for estimating the abundance of high-charge ions relevant to x-ray line radiation studies. {copyright} {ital 1997} {ital The American Physical Society}