Electronic band structure of the alkali halides. I. Experimental parameters

Experimental work on the electron energy-band structures of the alkali halides is reviewed in order to obtain a set of basic parameters (band gap Eg, threshold energy Eₜ, and electron affinity χ) that are used subsequently (paper II) to assess the merits of various theoretical band calculations. Included is a summary of our recent ultraviolet photoelectron spectroscopic studies of the alkali halides. Various experimental and interpretational difficulties are discussed and a number of systematic trends delineated.