The intercombination lines of the zinc sequence corresponding to the transition 4s4p ${}^3$$P_1$→4$s^2$ ${}^1$$S_0$ have been observed for xenon, lanthanum, neodymium, europium, gadolinium, and ytterbium in the Princeton Large Torus tokamak discharges.

• Received 12 February 1987

DOI:https://doi.org/10.1103/PhysRevA.35.4876