Measurement of n- and l-resolved State-selective Charge Exchange in Ar8+ Collision with He
| Autor: | Z. H. Xia, B. Ren, R. T. Zhang, L. Wei, J. Han, T. Meng, J. Wang, P. Ma, Y. Zhang, B. Tu, J. Xiao, K. Yao, Y. Zou, X. L. Zhu, D. L. Guo, X. Ma, B. Wei |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | The Astrophysical Journal. 933:207 |
| ISSN: | 1538-4357 0004-637X |
| DOI: | 10.3847/1538-4357/ac76c3 |
| Popis: | The state-resolved capture cross sections for principal n and orbital angular momentum l play an important role in modeling soft X-ray emissions induced by charge exchange for many astrophysical environments. However, the empirical and semiclassical theories used to produce these data of n- and l-resolved state-selective capture have not been well tested. Using the cold target recoil ion momentum spectroscopy apparatus at Fudan University, we perform a series of measurements of Ar8+ ion charge exchange with He in the collision energy range from 1.4 to 20 keV u−1. We find that electrons are mainly captured in the n = 4 state of Ar7+ ions. This agrees with the prediction of the scaling law for n capture. Moreover, the relative cross sections are reported for 4s-, 4p-, 4d-, and 4f-resolved state-selective capture. The often used analytical l distributions in the astrophysical literature are evaluated by comparing to the measurements. |
| Databáze: | OpenAIRE |
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