G.M. Bancroft, T.K. Sham, et al.
JACS
The energy gap between the lowest two valence bands for several binary compounds has been determined from photoemission distributions and is found to be a good measure of the ionicity parameter C of the Philips-Van Vechten theory. © 1973.
G.M. Bancroft, T.K. Sham, et al.
JACS
T. Gustafsson, E.W. Plummer, et al.
Solid State Communications
W.D. Grobman, D.E. Eastman
Physical Review Letters
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Solid State Communications