Photoemission studies of the gamma-alpha phase transition in Ce: Changes in 4f character

photoemmission studies of the ..gamma..-..cap alpha.. phase transition in cerium show changes in two 4f-related features in the valence band (0.3 and 2 eV below E/sub F/) and broadening of the multiplet structure in the region of the 4d-4f transitions. We show that the observed features can be explained by increased hybridization of the 4f wave function upon entering the ..cap alpha.. phase.