Photoelectron studies of metal carbonyls. Part 2.—The valence region photoelectron spectra of the group VIA hexacarbonyls

He(I), He(II) and valence region X-ray photoelectron spectra are reported for the Group VIA hexacarbonyls and are assigned on the basis of published molecular orbital calculations. A pronounced increase in intensity of the first photoelectron band is observed on descending the group, and multiplet structure is clearly discernible on this band in the case of W(CO)6.