High-resolution spectra of singly ionized cobalt have been recorded by
Fourier transform spectrometry in the region 1420-33333 Angstrom (704
22-3000 cm(-1)) with cobalt-neon and cobalt-argon hollow cathode lamps
as sources. Most of the Co II lines exhibit broadening due to hyperfi
ne structure, but the wavenumber uncertainty for the center of gravity
of the strongest lines is less than 0.002 cm(-1). Of the previously l
isted energy levels of Co II, 215 have been revised and six have been
discarded. In addition, 171 new levels have been found of which 125 ar
e reported here for the first time. The number of classified lines has
doubled with wavenumbers and classifications being presented for 2373
Co II lines, of which 1242 involve the new levels.