Resolving an anomaly between measured spectral linewidths of n=3 transitions in N II and O III spectra.
A reported anomaly in the experimental scaling of the widths of Stark broadened n=3, Delta n=0 spectral lines along the carbon isoelectronic sequence is not observed in the present experiments. The ratio omega(N)/omega(O) of widths for N II lines compared to those for the narrower O III lines for the same transitions is now measured as lying between two theoretical predictions, both of which show a value omega(z-1)/omega(z) greater than unity continuing throughout the sequence. In the earlier measurements, the widths (in frequency units) were actually measured as being smaller for N II than for O III, i.e., a ratio omega(z-1)/omega(z) less than unity.
Elton
R C
RC
Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742, USA. elton@umd.edu
Ghosh
J
J
Griem
H R
HR
Iglesias
E J
EJ