VIBRONIC TRANSITIONS IN NI-2(+)

Nickel dimer ions produced and cooled in a supersonic expansion are st udied by two-color resonant photodissociation. Five excited electronic states have been analyzed and their corresponding vibrational frequen cies, anharmonicities and electronic origins are presented. The vibrat ional quantum numbering for all the assigned transitions has been dete rmined via analysis of the spectra of the naturally occurring isotopic variants of the molecule, The ground state stretching frequency for t he Ni-58(2)+ is estimated from this isotopic analysis as 270 +/- 25 cm (-1).