Laser optogalvanic spectroscopy of the even-parity 3dnl J=0 and J=2 autoionizing Rydberg states of calcium

Abstract
Using a two-step laser optogalvanic technique in a Ca DC discharge the authors have measured the energies of the even 3dnd J=0 and J=2 as well as some 3dng J=2 autoionizing states of Ca in the range below 62500 cm-1, for which calculations have been published. In general the agreement between experimental and theoretical values is very good. Especially important is the detection of the '4p2'1S0 and, probably, the 4p5p3D2 perturbers.