Line competition in the neutral argon laser

Uncertainties in transition assignments for the neutral argon laser lines at 1.792 and 2.208 μm have been resolved by operation of a CW neutral argon laser with several simultaneous output wavelengths. The observed competition effects have established the correct transition for the 1.792-μm line to be
3d(1/2)_{1}\deg -4p(3/2)_{2}
and for the 2.208-μm line to be
3d(1/2)_{1}\deg -4p'(3/2)_{2}
.