The X-ray spectra of highly ionized hafnium, tantalum, tungsten and rh
enium have been observed in laser-produced plasmas. Isolated peaks wer
e found in the 3.6 to 5 Angstrom region. A detailed analysis of these
peaks has been performed by using the spin-orbit-split array model of
Bauche-Arnoult et al. Besides the resonance lines in the Ni-like ions,
the Sd-nf transition bands in Cu-like through Ge-like ions were ident
ified.