Volume 518, July-August 2010Herschel: the first science highlights
|Number of page(s)||12|
|Section||Atomic, molecular, and nuclear data|
|Published online||03 September 2010|
Stark halfwidth trends along the homologous sequence of singly ionized noble gases
Departamento de Física Teórica, Atómica y Óptica, Universidad de Valladolid, 47071 Valladolid, Spain e-mail: firstname.lastname@example.org
2 Faculty of Sciences, Department of Physics, Trg Dositeja Obradovića 4, 21000 Novi Sad, Serbia
Accepted: 18 February 2010
Aims. The aim of this work is to analyse experimental Stark halfwidths behaviour for the P)ns–P)np and P)np–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 P)ns–P)np transitions are more or less constant, while those of P)np–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.
Key words: plasmas / atomic data / line: profiles
© ESO, 2010
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