C I Isoelectronic Sequence: Observations of 2sm2pn-2sm-12pn+1Intersystem Transitions and Improved Measurements for CI XII, K XIV, Ca XV, Sc XVI, Ti XVII, and V XVIII

Spectra of C1 through V (excluding Ar) were produced with a 1 GW (15 ns) pulse from a Nd-glass laser impinging on solid targets and observed with a 10.7-m grazing incidence spectrograph. Strong 2 s m 2 p n -2 s m -1 2 p n +1 transition arrays in the C I isoelectronic sequence were recorded, from which intersystem lines were identified and improved wavelength measurements of allowed lines were made. Hartree-Fock calculations of the radial integrals were compared with those obtained from least squares fits of the energy levels of this sequence.