Measurements of spectral line strengths within some Cl multiplets belonging to the 3p-3d and 3p-4s transition arrays

With a high-current wall-stabilized are, operated in helium with small admi xtures of CO2, relative line strengths for some prominent infrared multiple ts of neutral carbon have been measured. The results are analyzed in conjun ction with previously obtained experimental data in the visible and near in frared region of the spectrum. Our experimental results are compared with t hose resulting from the Russell-Saunders coupling scheme and with recent so phisticated intermediate coupling calculations. The results of this paper m ay be helpful for the improvement of atomic structure codes used for line s trength calculations. The determined relative line strengths may also be us eful in astrophysical applications.