Electron-ion recombination rate coefficients of carbon-like Ar12+. (18th March 2020)

• Record Type: Journal Article
• Authors: Mahmood, S; Huang, Z K; Wen, W Q; Wang, S X; Chen, C Y; Khan, N; Xu, X; Dou, L J; Wang, H B; Zhu, X L.; Zhao, D M; Mao, L J; Ma, X M; Li, J; Tang, M T; Mao, R S; Yang, W Q; Yin, D Y; Yuan, Y J; Yang, J C; Zhu, L F; Ma, X
• Is Part Of: Journal of physics. Volume 53:Number 8(2020:Apr. 15)
• Publication Date: 2020-03-18
• Subjects: atomic processes -- atomic data -- electron-ion-recombination -- heavy ion storage ring; Atoms -- Periodicals; Molecules -- Periodicals; Optics -- Periodicals; Nuclear physics -- Periodicals; 539.6
• DOI: 10.1088/1361-6455/ab7424
• Languages: English
• ISSNs: 0953-4075

Abstract

Abstract: Electron-ion recombination of carbon-like Ar 12+ forming Ar 11+ has been investigated for the first time by using the cooler storage ring CSRm at the Institute of Modern Physics in Lanzhou, China. The absolute recombination rate coefficients are derived from the measurement in the electron-ion collision energy range of 0–50 eV, covering dielectronic recombination (DR) resonances associated with 2 s 2 2 p 2 and 2 s 2 p 3 (Δ n = 0) core excitations. Theoretical results are obtained by employing FAC code and compared with the experimental recombination spectrum. An overall agreement is found in resonance energy positions between merged-beam and calculated spectra. Temperature dependent rate coefficients are derived from the measured DR spectrum by convoluting it with a Maxwell–Boltzmann energy distribution and compared with the calculations from the literature. In the presented temperature range 10 3 –10 7 K, the experimentally derived rate coefficients agree with the theoretical results of Gu (2003 Astrophys. J. 590 1131) within the experimental uncertainties. The calculation by Zatsarinny et al (2004 Astron. Astrophys. 417 1173) underestimates the rate coefficients in the temperature range 10 3 –5 × 10 4 K. The combination of the experimental results and theoretical calculation provides a benckmark for Ar 12+ recombination data used in astrophysical modeling.