Linewidths of the 5419-Å line are measured in a conventional shock tube. The Stark effect is the dominant broadening mechanism. Electron densities vary through the range 2.8×${10}^{16}$–2.2×${10}^{17}$ ${\mathrm{cm}}^{\mathrm{-}3}$, and temperatures vary from 8300 to 16 000 K. The Stark parameter increases by a factor of 2 as the temperature decreases. Results are compared with previous experimental data and semiempirical calculations.

• Received 2 May 1988

DOI:https://doi.org/10.1103/PhysRevA.38.5742