The weighted oscillator strengths, (gf), of 478 known and new spectral line
s belonging to the 4s(2)4p(3), 4s4p(4), 4s(2)4p(2)5p and 4s(2)4p(2) (5S + 6
s + 4d + 5d) transitions array in KrIV, were carried out in a multiconfigur
ational Hartree-Fock relativistic approach. In this calculation, the electr
ostatic parameters were optimised by a least-square procedure in order to i
mprove the adjustment to experimental energy levels. (C) 2000 Elsevier Scie
nce Ltd. All rights reserved.