We present a lifetime measurement of the 3s 23p 5 2 Po 1/2 first excited fine-structure level of the ground state configuration in chlorine-like Fe X, which relaxes to the ground state through a magnetic dipole (M1) transition (the so-called red coronal line) with a wavelength accurately determined to 637.454(1) nm. Moreover, the Zeeman splitting of line was observed. The lifetime of 14.2(2) ms is the most precise one measured in the red wavelength region and agrees well with advanced theoretical predictions and an empirically scaled interpolation based on experimental values from the same isoelectronic sequence.
G. Brenner and J. R. Crespo Lopez-Urrutia and S. Bernitt and D. Fischer and R. Ginzel and K. U. Kuhnel and V. Mackel and P. H. Mokler and M. C. Simon and J. H. Ullrich, "On the Transition Rate of the Fe X RED Coronal Line," Astrophysical Journal, vol. 703, no. 1, pp. 68-73, Institute of Physics - IOP Publishing, Sep 2009.
The definitive version is available at https://doi.org/10.1088/0004-637X/703/1/68
Keywords and Phrases
Atomic Data; Atomic Processes; Line:profiles; Plasmas; Stars:coronae; Sun:corona
International Standard Serial Number (ISSN)
Article - Journal
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