Mg II 448.1 nm spectral line stark broadening parameters

Abstract

The Stark width (W) and shift (d) of the singly ionized magnesium (Mg II) 448.1 nm spectral line in 3d 2Ds/2-4f 2F 07/2 transition have been measured at a 16 900 K electron temperature and 1.35 x 1023 m-3 electron density in nitrogen plasma generated in an optically thin linear, low-pressure, pulsed arc discharge. They represent the first experimental results obtained at an electron temperature higher than 12 000 K. Magnesium atoms, as impurities in the driving gas, have been introduced by erosion from the pure magnesium bands fixed on the discharge electrodes providing conditions free of self-absorption. Our W and d have been compared to existing experimental and theoretical data. A good agreement was found between the results calculated by semiclassical perturbation formalism and our data, particulary in the case of the Stark shift. © 2005 The Japan Society of Applied Physics.