THE 3P PHOTOABSORPTION SPECTRA OF K-II AND CA-III

The 3p photoabsorption spectra of K II and Ca III have been recorded i n the 25-55 eV region using the dual laser plasma technique. With the help of calculations performed with the Cowan code and Rydberg series expansions, many 3p --> ns, d transitions have been identified in thes e ions. Strong LS-term-dependent behaviour arising from 3d wavefunctio n contraction is seen to influence intensities and quantum defects in the 3p --> nd series.