Resolving an anomaly between measured spectral linewidths of n=3 transitions in N II and O III spectra

• Published in: Physical review. E, Statistical, nonlinear, and soft matter physics Vol. 69; no. 6 Pt 2; p. 067403
• Main Authors: Elton, R C, Ghosh, J, Griem, H R, Iglesias, E J
• Format: Journal Article
• Language: English
• Published: United States 01-06-2004
• ISSN: 1539-3755; 1550-2376
• DOI: 10.1103/PhysRevE.69.067403

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.