Researchers recently obtained new results on dielectronic recombination precision spectroscopy. One of the most important collision reactions in the plasma environment is electron-ion recombination.
The most fundamental input parameters for astrophysical and fusion plasma modeling are precise electron-ion recombination rate coefficients. The radiation lines produced by the dielectronic recombination (DR) process can be used as an effective probe for electron temperature and density diagnostic in plasmas.
In conjunction with the electron-cooler device, the heavy-ion storage ring provides a unique experimental platform for highly charged ion dielectronic recombination precision spectroscopy research. Storage ring DR experiments typically have extremely high energy resolution. The relative energy between the electron and ion beams can be precisely detuned over a broad energy range. This provides the only method to measure low-energy DR processes, particularly near the ionization threshold.
The DR precision spectroscopy of C-like calcium and Na-like Krypton was successfully performed at the heavy-ion storage ring (HIRFL-CSRm) in Lanzhou, China.
They calculated the absolute DR rate coefficients of 40Ca14+ and 86Kr25+ in the energy range of 0-90 eV and carefully compared them to the results of the Flexible Atomic Code and AUTOSTRUCTURE codes. Furthermore, the plasma rate coefficient for plasma modeling was obtained and compared to the previously recommended theoretical data.
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