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Eective electron excitation collision strengths have been calculated for ne-structure forbidden transitions within the 5p k (k = 1, 3, 4) ground congu- rations of Xe iii ,X eiv ,X evi and the 5p 5 conguration of Ba iv. In addition calculations have been performed for allowed and forbidden transitions within the three low- est congurations of Ba ii. For astrophysical applications the data are tabulated in the range 2 000 50 000 K. The applicability of the Breit-Pauli R-matrix technique to the computation of collision strengths for xenon and barium ions has been investigated by comparison with test calcu- lations using the Dirac R-matrix method. Our data will be employed in quantitative analyses of highly excited nebular spectra, especially of NGC 7027 where important implications for the interpretation of collisionally excited transitions in the heavy ions are expected.

Effective collision strengths for electron impact excitation of Xe III, Xe IV, Xe VI and Ba II, Ba IV