J.F. van der Veen, F.J. Himpsel, et al.
Solid State Communications
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.
J.F. van der Veen, F.J. Himpsel, et al.
Solid State Communications
D.E. Eastman, J. Freeouf
Physical Review Letters
G.M. Bancroft, W. Gudat, et al.
Journal of Electron Spectroscopy and Related Phenomena
G. Aeppli, J.J. Donelon, et al.
Journal of Electron Spectroscopy and Related Phenomena