Doublet line-strength ratios for the principal series of cesium

Space-charge amplification of the indirect ionization resulting from photoabsorption in cesium vapor has been shown to offer to conventional techniques of absorption spectroscopy a useful complement of highest sensitivity. It was used in this work together with a xenon continuum source filtered to a linewidth of 0.14 A to measure the relative absorption probabilities for transitions of the cesium-principal-series (6 2S-n 2P1/2,3/2) doublets. Anomalous pressure effects on the resulting line-strength ratios, resulting in part from polarization molecules of Cs2*, were examined over a range of cesium-atom concentration varying from 1.2times1014 to 1.5times1015 cm-3. From the corrected doublet line-strength ratios for 11less than or equal tonless than or equal to16, the segment of the curve of Fano X parameters corresponding to discrete energies was constructed. Interpolation between these results and those from electron-polarization experiments served to locate the pole in the principal-series, doublet line-strength ratio near 19 2P