Stark halfwidth trends along the homologous sequence of singly ionized noble gases

Abstract

Aims. The aim of this work is to analyse experimental Stark halfwidths behaviour for the ( 3 P)ns−( 3 P)np and ( 3 P)np−( 3 P)nd transitions along the homologous sequence of single ionized noble gases. This kind of trend analysis can be useful for Stark halfwidths predictions and therefore for spectroscopic diagnostic of astrophysical plasmas. Methods. The compilation of Stark halfwidths was done taking into account the measurements developed in the last decades. The experimental results and observed Stark halfwidth trends for different multiplets of ionized noble gases were compared with the modified semiempirical formula (MSE) calculations and other theoretical estimations.Results. The analysis shows that the halfwidths of the spectral lines in all observed multiplets belonging to the same transitions have a similar trend along the homologous sequence. Stark halfwidths of ( 3 P)ns−( 3 P)np transitions are more or less constant, while those of ( 3 P)np−( 3 P)nd transitions have a clear increasing slope. A qualitative explanation of the observed Stark halfwidth trends based on the energy level structure is also given.

Stark halfwidth trends along the homologous sequence of doubly ionized noble gases

“…9) are higher than the other results. Interestingly the same behavior is shown by Ne II results for the singly ionized noble gas homologous sequence (Peláez et al 2010). With the exception of Ne III results and taking into account the data dispersion, due to experimental errors, we can conclude that the introduced factor (1, 2) normalizes the results, i.e., it preserves a constant value of ratio (2).…”

“…As already mentioned, we used the modified semiempirical formula MSE (Dimitrijević & Konjević 1980) and the simplified modified semiempirical formula SMSE (Dimitrijević & Konjević 1987) for our calculation, see for details Peláez et al (2010 Fig. 2).…”

“…In expressions (1) and (2), n * j represents the effective principal quantum number, while l j is the orbital angular momentum quantum number of the desired transition with j = i and j = f for the upper and lower energy level, respectively. More explanations about this ratio and normalization factor are given in Peláez et al (2010) the sequence is shown in Fig. 9.…”

“…Similar investigations were conducted in papers by Miller et al (1980) for other ionized atoms and by and Vitel et al (1988) for neutral atoms. More details about the regularities and systematic trends of the Stark parameters are given in Peláez et al (2010). Here, we analyzed Stark halfwidths, corresponding to (n − 1)d − np and ns − np transitions, along the homologous sequence of doubly ionized noble gases.…”

Regularities and Systematic Trends on Zr IV Stark Widths

“…All of Purić's formulae are of type of Equation (1). Purić's works are shown to be useful in some analysis and comparisons, and investigations of systematic trends and regularities, for example in the cases of searching the regularities and trends via specific homologous sequences [15,16].…”