Wavelength tuning of nitrogen pumped dye laser

On the Sn I and Sn II Stark broadening

“…The measured Sn II Stark widths presented in [4,5,7] are much higher than those measured in [6] (up to four times higher on average). The recent calculation, presented in [10], refers Sn II W values that are in agreement with six experimental values reported in [6].…”

“…So, their discussion in [7] was not complete and gave invalid information for readers. It should be mentioned that the recently calculated Sn II W values [10], based on the modified semi-empirical approach [12], are up to six times smaller than those calculated in [4,7,9] on the basis of the semi-empirical approach [11]. In [10], no details about performed calculations are given except the fact that two perturbing energy levels 7f 2 F o and 8f 2 F o are missing to provide correct 6p-7d and 6p-8d calculations, respectively.…”

“…It should be mentioned that the recently calculated Sn II W values [10], based on the modified semi-empirical approach [12], are up to six times smaller than those calculated in [4,7,9] on the basis of the semi-empirical approach [11]. In [10], no details about performed calculations are given except the fact that two perturbing energy levels 7f 2 F o and 8f 2 F o are missing to provide correct 6p-7d and 6p-8d calculations, respectively. The authors pointed out that this resulted in a smaller theoretical width values for lines of the corresponding multiplets, which further increases the ratio of experimental to theoretical values (W m /W th ).…”

“…Our measured Sn II and Sn I Stark FWHM (W m ) are presented in tables 1 and 2 together with data from other authors. W th represents the recently calculated Sn II Stark widths in [10] for electrons as perturbers only. It should be mentioned that the characteristic contribution to the line shape comes from the emitter itself, due to possible splitting ( hfs ) in the hyperfine structure (hfs).…”

“…Four papers [4][5][6][7] deal with experimental investigations of Stark widths of singly ionized tin spectral lines and three papers [4,7,8] are dedicated to measurement of six neutral tin W values. Theoretical calculations of the Sn II W values are presented in [4,7,9] and in [10] using the semi-empirical [11] and modified semi-empirical [12] approaches, respectively. Electron impact widths [4] computed by the semi-empirical formula [11] include broadening contributions from the three to four levels most strongly interacting with a line's upper and lower states.…”