Synchrotron radiation is used to obtain energy distributions of photoemitted electrons from KI above and below the threshold for hole-electron pair creation by the excited electrons. Because the inelastic scattering lengths are short (≲15 Å) above the threshold and long (>100 Å) below, the energy distribution of secondary electrons due to pair creation replicates the conduction-band density of states.

• Received 20 February 1973

DOI:https://doi.org/10.1103/PhysRevLett.31.304