Abstract
The analysis of Pt II is extended by using accurate wavelength measurements by Sansonetti et al. Forty-three new even and 104 new odd levels have been found. The Slater-Condon parametric method is used for the interpretation of the 5d(9), 5d(8)6s, and 5d(7)6s(2) low even configurations and the 5d(8)(7s+6d) high even configurations with root mean square deviations smaller than 80 cm(-1). The importance of the 5d(8)-5d(7)6s core interaction in interpreting the even-parity levels is stressed.