Abstract
Charge-state selective recombination rate coefficients were measured by time of flight (TOF) analyzed highly charged Si ions extracted from an electron-beam ion trap. Additionally, the combination of simultaneous TOF and x-ray measurements and a separation of the dielectronic recombination contribution in the x-ray spectra is used for extracting electron-impact excitation rate coefficients for several overlaying charge states. Experimentally derived dielectronic recombination spectra for XIII and XIV Si are compared and found in excellent agreement with the results of relativistic many-body perturbation theory calculations.
Highlights
Charged ions (HCIs) and, in particular, Si ions are abundant in the universe
Charge-state selective recombination rate coefficients were measured by time of flight (TOF) analyzed highly charged Si ions extracted from an electron-beam ion trap
The combination of simultaneous TOF and x-ray measurements and a separation of the dielectronic recombination contribution in the x-ray spectra is used for extracting electron-impact excitation rate coefficients for several overlaying charge states
Summary
Charged ions (HCIs) and, in particular, Si ions are abundant in the universe. Recently, 40% of the baryons “missing” from the nearby universe were found as ionized intergalactic gas, absorbing in the UV spectral range [1,2]. Photons originating from electron-impact excitation (EIE) and electron-ion recombination have important effects on the energy balance of the plasma and provide information about distant astrophysical as well as laboratory plasmas [4] Such data have a significant impact on guiding the modelers of the x-ray absorption features recently observed in the intergalactic and interstellar media and offer an insight into a detailed isonuclear abundance analysis and spectroscopy of highly ionized laboratory plasmas relevant for fusion research. Important progress in obtaining accurate electron-impact data for recombination was reached in the past two decades for atomic and molecular ions of a range of charges at cooler storage rings (CSRs) [8] and for HCIs at electron-beam ion traps (EBITs) [9] These two methods are complementary in the collision energy and use complementary detection of the electron-ion reaction products. A comparison of DR resonance parameters (resonant energies and strengths) between theoretical predictions and experimental observations show an excellent agreement
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