Observation of transitions from the 3p4, 3s3p23d, and 3s23d2 levels of the silicon-like Ca6+ ion in a laser plasma spectrum

Semiempirical calculations were used to identify about 50 lines in the spectrum of a calcium laser plasma as the 3s3p³, 3s²3p3d—3p⁴, 3s3p²3d, 3s²3d² transitions in the silicon-like Ca⁶⁺ ion. The results obtained were the first step in an investigation of the transitions from highly excited configurations of the complex with n = 3 in an isoelectronic sequence of silicon-like ions.