Experimental Stark parameters of Mn I lines in the y6P° → a6S multiplet under conditions of “long” laser plasma

Abstract

The Stark broadening parameters for the components of the y6P° → a⁶S Mn I multiplet have been determined under conditions of “long” laser plasma: the electron impact width and line shift due to the quadratic Stark effect have been measured in the range of electron densities of (4.8–45) × 10¹⁶ cm^–3. The presence of positive Stark shifts of the multiplet components (from +0.1 to +0.15 Å) has been demonstrated for the first time. The Stark widths are found to increase in the multiplet with a decrease in J of the upper level and significantly decrease with an increase in the plasma temperature. The d/w ratio is identical for all multiplet components; it amounts to 0.35–0.65, depending on the observation conditions. The dependences of this ratio on the plasma temperature and electron density have also been considered.