Magnetic-dipole lines in Fe-like and Mn-like molybdenum ions. (September 2022)

• Record Type: Journal Article
• Authors: He, Z.C.; Meng, J.; Li, Y.J.; Jia, F.S.; Khan, N.; Niu, B.; Huang, L.Y.; Hu, Z.M.; Li, J.G.; Wang, J.G.; Zou, Y.M.; Wei, B.R.; Yao, K.
• Is Part Of: Journal of quantitative spectroscopy & radiative transfer. Volume 288(2022)
• Publication Date: 2022-09
• Subjects: Magnetic dipole transition -- Electron beam ion trap -- Relativistic many-body perturbation theory -- Collisional-radiative modeling; Spectrum analysis -- Periodicals; Radiation -- Periodicals; Analyse spectrale -- Périodiques; Rayonnement -- Périodiques; Radiation; Spectrum analysis; Periodicals; 543.0858
• DOI: 10.1016/j.jqsrt.2022.108276
• Languages: English
• ISSNs: 0022-4073

Abstract

Highlights: Eleven optical spectral lines from Fe-like Mo 16 + and Mn-like Mo 17 + ions are measured at the newly developed low-energy electron beam ion trap, and ten of these lines are observed for the first time. The wavelengths and transition probabilities are calculated with the relativistic second-order many-body perturbation theory. Based on these atomic data, spectra simulations are carried out using the collisional-radiative (CR) modeling. The electron-density dependence of the line intensity ratios is studied using the CR modeling in a wide range of electron densities, i.e., 10 9 -10 13 cm − 3 . The potential applications of these electron-density sensitive lines for plasma diagnostics are discussed. Abstract: Optical spectra of Fe-like Mo 16 + and Mn-like Mo 17 + ions were measured using the newly developed low-energy electron-beam ion trap at Fudan University. The observed emission spectra incorporated six lines from Mo 16 + ions and five lines from Mo 17 + ions. These eleven lines included ten lines that were measured for the first time. Spectra modeling was carried out based on the collisional-radiative (CR) modeling implemented in the flexible atomic code. Overall, a reasonable agreement of wavelengths and intensities was found between the experimental results and the CR modeling. It is demonstrated that ten of the eleven observed lines arised from the magnetic-dipole transitions within the ground configurations of Mo 16 + and Mo 17 + ions. Furthermore, the electron-density dependence of the line intensity ratios was investigated in the range of 10 9 − 10 13 cm − 3 using CR modeling. The theoretical ratios were consistent with the experimental line intensity ratios for two electron densities of 3.27 × 10 11 cm − 3 and 2.56 × 10 11 cm − 3 . Moreover, several line intensity ratios were found to be sensitive to the electron density. The potential applications of these electron-density sensitive lines were demonstrated for plasma diagnostics.